2024/10/21 更新

写真a

タカハシ　ミツナリ
髙橋　光成
TAKAHASHI Mitsunari
所属
宇宙地球環境研究所 基盤研究部門 宇宙線研究部 特任助教
職名
特任助教

学位 1

  1. 博士（理学） （ 2018年9月 ） 

学位の先頭へ▲
 

論文 49

  1. Broadband characterisation of the very intense TeV flares of the blazar 1ES 1959+650 in 2016 査読有り 国際共著 国際誌

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, D. Baack, A. Babi{\'{c } }, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonz{\'{a } }lez, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Bil, O. Blanch, G. Bonnoli, Z. Bosnjak, G. Busetto, R. Carosi, G. Ceribella, Y. Chai, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, V. D'Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, F. Di Pierro, E. Do Souto Espi{\~{n } }eira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, A. Fern{\'{a } }ndez-Barral, G. Ferrara, D. Fidalgo, L. Foffano, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, S. Gallozzi, R. J. Garc{\'{\i } }a L{\'{o } }pez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Godinovi{\'{c } }, D. Green, D. Guberman, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. L{\'{o } }pez, R. L{\'{o } }pez-Coto, A. L{\'{o } }pez-Oramas, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Mart{\'{\i } }nez, S. Masuda, D. Mazin, S. Mi{\'{c } }anovi{\'{c } }, D. Miceli, M. Minev, J. M. Mir, a, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, P. Munar-Adrover, V. Neustroev, A. Niedzwiecki, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogu{\'{e } }s, M. Nöthe, S. Nozaki, S. Paiano, J. Palacio, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, P. Pe{\~{n } }il, M. Peresano, M. Persic, P. G. Prada Moroni, E. Pr, ini, I. Puljak, W. Rhode, M. Rib{\'{o } }, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, T. Schweizer, J. Sitarek, I. {\v{S } }nidari{\'{c } }, D. Sobczynska, A. Somero, A. Stamerra, D. Strom, M. Strzys, T. Suri{\'{c } }, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzi{\'{c } }, M. Teshima, N. Torres-Alb{\`{a } }, S. Tsujimoto, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, I. Vovk, M. Will, D. Zari{\'{c } }, M. Hayashida

    Astronomy & Astrophysics   638 巻   頁： A14 - A14   2020年6月

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    担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：{EDP} Sciences  

    <jats:p>1ES 1959+650 is a bright TeV high-frequency-peaked BL Lac object exhibiting interesting features like “orphan” TeV flares and broad emission in the high-energy regime that are difficult to interpret using conventional one-zone Synchrotron Self-Compton (SSC) scenarios. We report the results from the Major Atmospheric Gamma Imaging Cherenkov (MAGIC) observations in 2016 along with the multi-wavelength data from the <jats:italic>Fermi</jats:italic> Large Area Telescope (LAT) and <jats:italic>Swift</jats:italic> instruments. MAGIC observed 1ES 1959+650 with different emission levels in the very-high-energy (VHE, <jats:italic>E</jats:italic> &gt;  100 GeV) <jats:italic>γ</jats:italic>-ray band during 2016. In the long-term data, the X-ray spectrum becomes harder with increasing flux and a hint of a similar trend is also visible in the VHE band. An exceptionally high VHE flux reaching ∼3 times the Crab Nebula flux was measured by MAGIC on the 13 and 14 of June, and 1 July 2016 (the highest flux observed since 2002). During these flares, the high-energy peak of the spectral energy distribution (SED) lies in the VHE domain and extends up to several TeV. The spectrum in the <jats:italic>γ</jats:italic>-ray (both <jats:italic>Fermi</jats:italic>-LAT and VHE bands) and the X-ray bands are quite hard. On 13 June and 1 July 2016, the source showed rapid variations in the VHE flux within timescales of less than an hour. A simple one-zone SSC model can describe the data during the flares requiring moderate to large values of the Doppler factors (<jats:italic>δ</jats:italic> ≥ 30−60). Alternatively, the high-energy peak of the SED can be explained by a purely hadronic model attributed to proton-synchrotron radiation with jet power <jats:italic>L</jats:italic><jats:sub>jet</jats:sub> ∼ 10<jats:sup>46</jats:sup> erg s<jats:sup>−1</jats:sup> and under high values of the magnetic field strength (∼100 G) and maximum proton energy (∼few EeV). Mixed lepto-hadronic models require super-Eddington values of the jet power. We conclude that it is difficult to get detectable neutrino emission from the source during the extreme VHE flaring period of 2016.</jats:p>

    DOI： 10.1051/0004-6361/201935450

  2. A technique for estimating the absolute gain of a photomultiplier tube 査読有り

    M. Takahashi, Y. Inome, S. Yoshii, A. Bamba, S. Gunji, D. Hadasch, M. Hayashida, H. Katagiri, Y. Konno, H. Kubo, J. Kushida, D. Nakajima, T. Nakamori, T. Nagayoshi, K. Nishijima, S. Nozaki, D. Mazin, S. Mashuda, R. Mirzoyan, H. Ohoka, R. Orito, T. Saito, S. Sakurai, J. Takeda, M. Teshima, Y. Terada, F. Tokanai, T. Yamamoto, T. Yoshida

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   894 巻   頁： 1 - 7   2018年6月

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    担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier {BV}  

    DOI： 10.1016/j.nima.2018.03.034

  3. Multiwavelength Observations of the Blazar VER J0521+211 during an Elevated TeV Gamma-Ray State 査読有り

    C. B. Adams, P. Batista, W. Benbow, A. Brill, R. Brose, J. H. Buckley, M. Capasso, J. L. Christiansen, M. Errando, Q. Feng, J. P. Finley, G. M. Foote, L. Fortson, A. Furniss, G. Gallagher, A. Gent, C. Giuri, W. F. Hanlon, D. Hanna, T. Hassan, O. Hervet, J. Holder, B. Hona, G. Hughes, T. B. Humensky, W. Jin, P. Kaaret, M. Kertzman, D. Kieda, T. K. Kleiner, F. Krennrich, S. Kumar, M. J. Lang, M. Lundy, G. Maier, J. Millis, P. Moriarty, R. Mukherjee, M. Nievas-Rosillo, S. O’Brien, R. A. Ong, A. N. Otte, S. Patel, S. R. Patel, K. Pfrang, M. Pohl, R. R. Prado, E. Pueschel, J. Quinn, K. Ragan, P. T. Reynolds, D. Ribeiro, E. Roache, J. L. Ryan, I. Sadeh, M. Santander, G. H. Sembroski, R. Shang, B. Stevenson, J. V. Tucci, V. V. Vassiliev, S. P. Wakely, A. Weinstein, R. M. Wells, D. A. Williams, T. J. Williamson, V. A. Acciari, T. Aniello, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, C. Arcaro, M. Artero, K. Asano, D. Baack, A. Babić, A. Baquero, U. Barres de Almeida, J. A. Barrio, I. Batković, J. Becerra González, W. Bednarek, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, H. Bökenkamp, G. Bonnoli, Ž. Bošnjak, I. Burelli, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D’Amico, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, A. Del Popolo, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, L. Fariña, A. Fattorini, L. Font, C. Fruck, S. Fukami, Y. Fukazawa, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinović, J. G. Green, D. Green, D. Hadasch, A. Hahn, T. Hassan, L. Heckmann, J. Herrera, D. Hrupec, M. Hütten, T. Inada, R. Iotov, K. Ishio, Y. Iwamura, I. Jiménez Martínez, J. Jormanainen, L. Jouvin, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, L. Linhoff, S. Lombardi, F. Longo, R. López-Coto, M. López-Moya, A. López-Oramas, S. Loporchio, A. Lorini, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, G. Maneva, M. Manganaro, K. Mannheim, M. Mariotti, M. Martínez, A. Mas Aguilar, D. Mazin, S. Menchiari, S. Mender, S. Mićanović, D. Miceli, T. Miener, J. M. Miranda, R. Mirzoyan, E. Molina, H. A. Mondal, A. Moralejo, D. Morcuende, V. Moreno, T. Nakamori, C. Nanci, L. Nava, V. Neustroev, M. Nievas Rosillo, C. Nigro, K. Nilsson, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletić, P. Peñil, M. Persic, M. Pihet, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F. G. Saturni, B. Schleicher, K. Schmidt, F. Schmuckermaier, J. L. Schubert, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Spolon, A. Stamerra, J. Strišković, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, R. Takeishi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, L. Tosti, S. Truzzi, A. Tutone, S. Ubach, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, I. Viale, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, C. Wunderlich, T. Yamamoto, D. Zarić

    The Astrophysical Journal   932 巻 ( 2 ) 頁： 129 - 129   2022年6月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：American Astronomical Society  

    Abstract

    We report on a long-lasting, elevated gamma-ray flux state from VER J0521+211 observed by VERITAS, MAGIC, and Fermi-LAT in 2013 and 2014. The peak integral flux above 200 GeV measured with the nightly binned light curve is (8.8 ± 0.4) × 10<sup>−7</sup> photons m<sup>−2</sup> s<sup>−1</sup>, or ∼37% of the Crab Nebula flux. Multiwavelength observations from X-ray, UV, and optical instruments are also presented. A moderate correlation between the X-ray and TeV gamma-ray fluxes was observed, and the X-ray spectrum appeared harder when the flux was higher. Using the gamma-ray spectrum and four models of the extragalactic background light (EBL), a conservative 95% confidence upper limit on the redshift of the source was found to be z ≤ 0.31. Unlike the gamma-ray and X-ray bands, the optical flux did not increase significantly during the studied period compared to the archival low-state flux. The spectral variability from optical to X-ray bands suggests that the synchrotron peak of the spectral energy distribution (SED) may become broader during flaring states, which can be adequately described with a one-zone synchrotron self-Compton model varying the high-energy end of the underlying particle spectrum. The synchrotron peak frequency of the SED and the radio morphology of the jet from the MOJAVE program are consistent with the source being an intermediate-frequency-peaked BL Lac object.

    DOI： 10.3847/1538-4357/ac6dd9

    その他リンク： https://iopscience.iop.org/article/10.3847/1538-4357/ac6dd9/pdf

  4. Proton acceleration in thermonuclear nova explosions revealed by gamma rays 査読有り

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, M. Artero, K. Asano, D. Baack, A. Babić, A. Baquero, U. Barres de Almeida, J. A. Barrio, I. Batković, J. Becerra González, W. Bednarek, L. Bellizzi, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, H. Bökenkamp, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D’Amico, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, A. Del Popolo, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, L. Fariña Alonso, A. Fattorini, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, Y. Fukazawa, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinović, J. G. Green, D. Green, D. Hadasch, A. Hahn, T. Hassan, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, K. Ishio, Y. Iwamura, I. Jiménez Martínez, J. Jormanainen, L. Jouvin, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, L. Linhoff, S. Lombardi, F. Longo, R. López-Coto, M. López-Moya, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, A. Mas Aguilar, D. Mazin, S. Menchiari, S. Mender, S. Mićanović, D. Miceli, T. Miener, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, T. Nakamori, L. Nava, V. Neustroev, M. Nievas Rosillo, C. Nigro, K. Nilsson, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletić, P. Peñil, M. Persic, M. Pihet, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F. G. Saturni, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Spolon, A. Stamerra, J. Strišković, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, R. Takeishi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, L. Tosti, S. Truzzi, A. Tutone, S. Ubach, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, C. Wunderlich, T. Yamamoto, D. Zarić, F. Ambrosino, M. Cecconi, G. Catanzaro, C. Ferrara, A. Frasca, M. Munari, L. Giustolisi, J. Alonso-Santiago, M. Giarrusso, U. Munari, P. Valisa

    Nature Astronomy   6 巻 ( 6 ) 頁： 689 - 697   2022年6月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

    Classical novae are cataclysmic binary star systems in which the matter of a companion star is accreted on a white dwarf1,2. Accumulation of hydrogen in a layer eventually causes a thermonuclear explosion on the surface of the white dwarf3, brightening the white dwarf to ~105 solar luminosities and triggering ejection of the accumulated matter. Novae provide the extreme conditions required to accelerate particles, electrons or protons, to high energies. Here we present the detection of gamma rays by the MAGIC telescopes from the 2021 outburst of RS Ophiuchi, a recurrent nova with a red giant companion, which allowed us to accurately characterize the emission from a nova in the 60 GeV to 250 GeV energy range. The theoretical interpretation of the combined Fermi LAT and MAGIC data suggests that protons are accelerated to hundreds of gigaelectronvolts in the nova shock. Such protons should create bubbles of enhanced cosmic ray density, of the order of 10 pc, from the recurrent novae.

    DOI： 10.1038/s41550-022-01640-z

    Scopus

    arXiv

    その他リンク： https://www.nature.com/articles/s41550-022-01640-z

  5. Investigating the Blazar TXS 0506+056 through Sharp Multiwavelength Eyes During 2017–2019 査読有り

    V. A. Acciari, T. Aniello, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, M. Artero, K. Asano, D. Baack, A. Babić, A. Baquero, U. Barres de Almeida, J. A. Barrio, I. Batković, J. Becerra González, W. Bednarek, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, H. Bökenkamp, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D’Amico, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, A. Del Popolo, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, L. Fariña, A. Fattorini, L. Font, C. Fruck, S. Fukami, Y. Fukazawa, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinović, J. G. Green, D. Green, D. Hadasch, A. Hahn, T. Hassan, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, R. Iotov, K. Ishio, Y. Iwamura, I. Jiménez Martínez, J. Jormanainen, L. Jouvin, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, L. Linhoff, S. Lombardi, F. Longo, R. López-Coto, M. López-Moya, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, M. Mariotti, M. Martínez, A. Mas Aguilar, D. Mazin, S. Menchiari, S. Mender, S. Mićanović, D. Miceli, T. Miener, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, T. Nakamori, L. Nava, V. Neustroev, M. Nievas Rosillo, C. Nigro, K. Nilsson, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletić, P. Peñil, M. Persic, M. Pihet, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F. G. Saturni, B. Schleicher, K. Schmidt, F. Schmuckermaier, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Spolon, A. Stamerra, J. Strišković, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, R. Takeishi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, L. Tosti, S. Truzzi, A. Tutone, S. Ubach, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, I. Viale, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, C. Wunderlich, T. Yamamoto, D. Zarić, M. Hodges, T. Hovatta, S. Kiehlmann, I. Liodakis, W. Max-Moerbeck, T. J. Pearson, A. C. S. Readhead, R. A. Reeves, A. Lähteenmäki, M. Tornikoski, J. Tammi, F. D’Ammando, A. Marchini

    The Astrophysical Journal   927 巻 ( 2 ) 頁： 197 - 197   2022年3月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：American Astronomical Society  

    Abstract

    The blazar TXS 0506+056 got into the spotlight of the astrophysical community in 2017 September, when a high-energy neutrino detected by IceCube (IceCube-170922A) was associated at the 3σ level with a γ-ray flare from this source. This multi-messenger photon-neutrino association remains, as per today, the most significant association ever observed. TXS 0506+056 was a poorly studied object before the IceCube-170922A event. To better characterize its broadband emission, we organized a multiwavelength campaign lasting 16 months (2017 November to 2019 February), covering the radio band (Metsähovi, OVRO), the optical/UV (ASAS-SN, KVA, REM, Swift/UVOT), the X-rays (Swift/XRT, NuSTAR), the high-energy γ rays (Fermi/LAT), and the very high-energy (VHE) γ rays (MAGIC). In γ rays, the behavior of the source was significantly different from the behavior in 2017: MAGIC observations show the presence of flaring activity during 2018 December, while the source only shows an excess at the 4σ level during the rest of the campaign (74 hr of accumulated exposure); Fermi/LAT observations show several short (on a timescale of days to a week) flares, different from the long-term brightening of 2017. No significant flares are detected at lower energies. The radio light curve shows an increasing flux trend that is not seen in other wavelengths. We model the multiwavelength spectral energy distributions in a lepto-hadronic scenario, in which the hadronic emission emerges as Bethe-Heitler and pion-decay cascade in the X-rays and VHE γ rays. According to the model presented here, the 2018 December γ-ray flare was connected to a neutrino emission that was too brief and not bright enough to be detected by current neutrino instruments.

    DOI： 10.3847/1538-4357/ac531d

    Scopus

    その他リンク： https://iopscience.iop.org/article/10.3847/1538-4357/ac531d/pdf

  6. Combined searches for dark matter in dwarf spheroidal galaxies observed with the MAGIC telescopes, including new data from Coma Berenices and Draco 査読有り

    V.A. Acciari, S. Ansoldi, L.A. Antonelli, A. Arbet Engels, M. Artero, K. Asano, D. Baack, A. Babić, A. Baquero, U. Barres de Almeida, J.A. Barrio, I. Batković, J. Becerra González, W. Bednarek, L. Bellizzi, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, H. Bökenkamp, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S.M. Colak, E. Colombo, J.L. Contreras, J. Cortina, S. Covino, G. D’Amico, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, M.V. Fonseca, L. Font, C. Fruck, S. Fukami, R.J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinović, J.G. Green, D. Green, D. Hadasch, A. Hahn, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, K. Ishio, Y. Iwamura, I. Jiménez, J. Jormanainen, L. Jouvin, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, L. Linhoff, S. Lombardi, F. Longo, R. López-Coto, M. López-Moya, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, S. Menchiari, S. Mender, S. Mićanović, D. Miceli, T. Miener, J.M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, V. Neustroev, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J.M. Paredes, L. Pavletić, P. Peñil, M. Persic, M. Pihet, P.G. Prada Moroni, E. Prandini, C. Priyadarshi, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F.G. Saturni, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Spolon, A. Stamerra, J. Strišković, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, R. Takeishi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, L. Tosti, S. Truzzi, A. Tutone, S. Ubach, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C.F. Vigorito, V. Vitale, I. Vovk, M. Will, C. Wunderlich, D. Zarić

    Physics of the Dark Universe   35 巻   頁： 100912 - 100912   2022年3月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

    DOI： 10.1016/j.dark.2021.100912

    arXiv

  7. Multiwavelength study of the gravitationally lensed blazar QSO B0218+357 between 2016 and 2020 査読有り

    V A Acciari, S Ansoldi, L A Antonelli, A Arbet Engels, M Artero, K Asano, D Baack, A Babić, A Baquero, U Barres de Almeida, J A Barrio, I Batković, J Becerra González, W Bednarek, L Bellizzi, E Bernardini, M Bernardos, A Berti, J Besenrieder, W Bhattacharyya, C Bigongiari, A Biland, O Blanch, G Bonnoli, Ž Bošnjak, G Busetto, R Carosi, G Ceribella, M Cerruti, Y Chai, A Chilingarian, S Cikota, S M Colak, E Colombo, J L Contreras, J Cortina, S Covino, G D’Amico, V D’Elia, P Da Vela, F Dazzi, A De Angelis, B De Lotto, M Delfino, J Delgado, C Delgado Mendez, D Depaoli, F Di Pierro, L Di Venere, E Do Souto Espiñeira, D Dominis Prester, A Donini, D Dorner, M Doro, D Elsaesser, V Fallah Ramazani, A Fattorini, G Ferrara, M V Fonseca, L Font, C Fruck, S Fukami, R J García López, M Garczarczyk, S Gasparyan, M Gaug, N Giglietto, F Giordano, P Gliwny, N Godinović, J G Green, D Green, D Hadasch, A Hahn, L Heckmann, J Herrera, J Hoang, D Hrupec, M Hütten, T Inada, S Inoue, K Ishio, Y Iwamura, I Jiménez, J Jormanainen, L Jouvin, Y Kajiwara, M Karjalainen, D Kerszberg, Y Kobayashi, H Kubo, J Kushida, A Lamastra, D Lelas, F Leone, E Lindfors, S Lombardi, F Longo, R López-Coto, M López-Moya, A López-Oramas, S Loporchio, B Machado de, Oliveira Fraga, C Maggio, P Majumdar, M Makariev, M Mallamaci, G Maneva, M Manganaro, K Mannheim, L Maraschi, M Mariotti, M Martínez, D Mazin, S Menchiari, S Mender, S Mićanović, D Miceli, T Miener, M Minev, J M Miranda, R Mirzoyan, E Molina, A Moralejo, D Morcuende, V Moreno, E Moretti, V Neustroev, C Nigro, K Nilsson, K Nishijima, K Noda, S Nozaki, Y Ohtani, T Oka, J Otero-Santos, S Paiano, M Palatiello, D Paneque, R Paoletti, J M Paredes, L Pavletić, P Peñil, C Perennes, M Persic, P G Prada Moroni, E Prandini, C Priyadarshi, I Puljak, W Rhode, M Ribó, J Rico, C Righi, A Rugliancich, L Saha, N Sahakyan, T Saito, S Sakurai, K Satalecka, F G Saturni, B Schleicher, K Schmidt, T Schweizer, J Sitarek, I Šnidarić, D Sobczynska, A Spolon, A Stamerra, D Strom, M Strzys, Y Suda, T Surić, M Takahashi, F Tavecchio, P Temnikov, T Terzić, M Teshima, L Tosti, S Truzzi, A Tutone, S Ubach, J van Scherpenberg, G Vanzo, M Vazquez Acosta, S Ventura, V Verguilov, C F Vigorito, V Vitale, I Vovk, M Will, C Wunderlich, D Zarić, F de Palma, F D’Ammando, A Barnacka, D K Sahu, M Hodges, T Hovatta, S Kiehlmann, W Max-Moerbeck, A C S Readhead, R Reeves, T J Pearson, A Lähteenmäki, I Björklund, M Tornikoski, J Tammi, S Suutarinen, K Hada, K Niinuma

    Monthly Notices of the Royal Astronomical Society   510 巻 ( 2 ) 頁： 2344 - 2362   2022年1月

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    掲載種別：研究論文（学術雑誌）  

    DOI： 10.1093/mnras/stab3454

    その他リンク： https://academic.oup.com/mnras/article-pdf/510/2/2344/42113339/stab3454.pdf

  8. Search for Very High-energy Emission from the Millisecond Pulsar PSR J0218+4232 査読有り

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, M. Artero, K. Asano, D. Baack, A. Babić, A. Baquero, U. Barres de Almeida, J. A. Barrio, I. Batković, J. Becerra González, W. Bednarek, L. Bellizzi, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D’Amico, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinović, J. G. Green, D. Green, D. Hadasch, A. Hahn, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, I. Jiménez, J. Jormanainen, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, R. López-Coto, M. López-Moya, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, S. Menchiari, S. Mender, S. Mićanović, D. Miceli, T. Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, V. Neustroev, C. Nigro, K. Nilsson, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletić, P. Peñil, C. Perennes, M. Persic, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F. G. Saturni, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, L. Tosti, S. Truzzi, A. Tutone, S. Ubach, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, C. Wunderlich, D. Zarić, P. A. Caraveo, I. Cognard, L. Guillemot, A. K. Harding, J. Li, B. Limyansky, C. Y. Ng, D. F. Torres, P. M. Saz Parkinson

    The Astrophysical Journal   922 巻 ( 2 ) 頁： 251 - 251   2021年12月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：American Astronomical Society  

    <title>Abstract</title>
    PSR J0218+4232 is one of the most energetic millisecond pulsars known and has long been considered as one of the best candidates for very high-energy (VHE; &gt;100 GeV) <italic>γ</italic>-ray emission. Using 11.5 yr of Fermi Large Area Telescope (LAT) data between 100 MeV and 870 GeV, and ∼90 hr of Major Atmospheric Gamma Imaging Cherenkov (MAGIC) observations in the 20 GeV to 20 TeV range, we searched for the highest energy <italic>γ</italic>-ray emission from PSR J0218+4232. Based on the analysis of the LAT data, we find evidence for pulsed emission above 25 GeV, but see no evidence for emission above 100 GeV (VHE) with MAGIC. We present the results of searches for <italic>γ</italic>-ray emission, along with theoretical modeling, to interpret the lack of VHE emission. We conclude that, based on the experimental observations and theoretical modeling, it will remain extremely challenging to detect VHE emission from PSR J0218+4232 with the current generation of Imaging Atmospheric Cherenkov Telescopes, and maybe even with future ones, such as the Cherenkov Telescope Array.

    DOI： 10.3847/1538-4357/ac20d7

    arXiv

    その他リンク： https://iopscience.iop.org/article/10.3847/1538-4357/ac20d7/pdf

  9. Investigation of the correlation patterns and the Compton dominance variability of Mrk 421 in 2017 査読有り

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, M. Artero, K. Asano, A. Babić, A. Baquero, U. Barres de Almeida, J. A. Barrio, I. Batković, J. Becerra González, W. Bednarek, L. Bellizzi, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, O. Blanch, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D’Amico, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, M. Doro, V. Fallah Ramazani, A. Fattorini, G. Ferrara, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinović, J. G. Green, D. Green, D. Hadasch, A. Hahn, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, I. Jiménez, J. Jormanainen, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, R. López-Coto, M. López-Moya, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, S. Menchiari, S. Mender, S. Mićanović, D. Miceli, T. Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, V. Neustroev, C. Nigro, K. Nilsson, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletić, P. Peñil, C. Perennes, M. Persic, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, I. Puljak, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F. G. Saturni, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, L. Tosti, S. Truzzi, A. Tutone, S. Ubach, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, C. Wunderlich, D. Zarić, D. Baack, M. Balbo, N. Biederbeck, A. Biland, T. Bretz, J. Buss, D. Dorner, L. Eisenberger, D. Elsaesser, D. Hildebrand, R. Iotov, K. Mannheim, D. Neise, M. Noethe, A. Paravac, W. Rhode, B. Schleicher, V. Sliusar, R. Walter, F. D’Ammando, D. Horan, A. Y. Lien, M. Baloković, G. M. Madejski, M. Perri, F. Verrecchia, C. Leto, A. Lähteenmäki, M. Tornikoski, V. Ramakrishnan, E. Järvelä, R. J. C. Vera, W. Chamani, M. Villata, C. M. Raiteri, A. C. Gupta, A. Pandey, A. Fuentes, I. Agudo, C. Casadio, E. Semkov, S. Ibryamov, A. Marchini, R. Bachev, A. Strigachev, E. Ovcharov, V. Bozhilov, A. Valcheva, E. Zaharieva, G. Damljanovic, O. Vince, V. M. Larionov, G. A. Borman, T. S. Grishina, V. A. Hagen-Thorn, E. N. Kopatskaya, E. G. Larionova, L. V. Larionova, D. A. Morozova, A. A. Nikiforova, S. S. Savchenko, I. S. Troitskiy, Y. V. Troitskaya, A. A. Vasilyev, O. A. Merkulova, W. P. Chen, M. Samal, H. C. Lin, J. W. Moody, A. C. Sadun, S. G. Jorstad, A. P. Marscher, Z. R. Weaver, M. Feige, J. Kania, M. Kopp, L. Kunkel, D. Reinhart, A. Scherbantin, L. Schneider, C. Lorey, J. A. Acosta-Pulido, M. I. Carnerero, D. Carosati, S. O. Kurtanidze, O. M. Kurtanidze, M. G. Nikolashvili, R. A. Chigladze, R. Z. Ivanidze, G. N. Kimeridze, L. A. Sigua, M. D. Joner, M. Spencer, M. Giroletti, N. Marchili, S. Righini, N. Rizzi, G. Bonnoli

    Astronomy & Astrophysics   655 巻   頁： A89 - A89   2021年11月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：EDP Sciences  

    <italic>Aims.</italic> We present a detailed characterisation and theoretical interpretation of the broadband emission of the paradigmatic TeV blazar Mrk 421, with a special focus on the multi-band flux correlations.


    <italic>Methods.</italic> The dataset has been collected through an extensive multi-wavelength campaign organised between 2016 December and 2017 June. The instruments involved are MAGIC, FACT, <italic>Fermi</italic>-LAT, <italic>Swift</italic>, GASP-WEBT, OVRO, Medicina, and Metsähovi. Additionally, four deep exposures (several hours long) with simultaneous MAGIC and <italic>NuSTAR</italic> observations allowed a precise measurement of the falling segments of the two spectral components.


    <italic>Results.</italic> The very-high-energy (VHE; <italic>E</italic> &gt;  100 GeV) gamma rays and X-rays are positively correlated at zero time lag, but the strength and characteristics of the correlation change substantially across the various energy bands probed. The VHE versus X-ray fluxes follow different patterns, partly due to substantial changes in the Compton dominance for a few days without a simultaneous increase in the X-ray flux (i.e., orphan gamma-ray activity). Studying the broadband spectral energy distribution (SED) during the days including <italic>NuSTAR</italic> observations, we show that these changes can be explained within a one-zone leptonic model with a blob that increases its size over time. The peak frequency of the synchrotron bump varies by two orders of magnitude throughout the campaign. Our multi-band correlation study also hints at an anti-correlation between UV-optical and X-ray at a significance higher than 3<italic>σ</italic>. A VHE flare observed on MJD 57788 (2017 February 4) shows gamma-ray variability on multi-hour timescales, with a factor ten increase in the TeV flux but only a moderate increase in the keV flux. The related broadband SED is better described by a two-zone leptonic scenario rather than by a one-zone scenario. We find that the flare can be produced by the appearance of a compact second blob populated by high energetic electrons spanning a narrow range of Lorentz factors, from <italic>γ</italic>′<sub>min</sub>=2×10<sup>4</sup> to <italic>γ</italic>′<sub>max</sub>=6×10<sup>5</sup>.

    DOI： 10.1051/0004-6361/202141004

    arXiv

  10. First detection of VHE gamma-ray emission from TXS 1515–273, study of its X-ray variability and spectral energy distribution 査読有り

    V A Acciari, S Ansoldi, L A Antonelli, A Arbet Engels, M Artero, K Asano, D Baack, A Babić, A Baquero, U Barres de Almeida, J A Barrio, I Batković, J Becerra González, W Bednarek, L Bellizzi, E Bernardini, M Bernardos, A Berti, J Besenrieder, W Bhattacharyya, C Bigongiari, A Biland, O Blanch, Ž Bošnjak, G Busetto, R Carosi, G Ceribella, M Cerruti, Y Chai, A Chilingarian, S Cikota, S M Colak, E Colombo, J L Contreras, J Cortina, S Covino, G D’Amico, V D’Elia, P Da Vela, F Dazzi, A De Angelis, B De Lotto, M Delfino, J Delgado, C Delgado Mendez, D Depaoli, F Di Pierro, L Di Venere, E Do Souto Espiñeira, D Dominis Prester, A Donini, D Dorner, M Doro, D Elsaesser, V Fallah Ramazani, A Fattorini, G Ferrara, M V Fonseca, L Font, C Fruck, S Fukami, R J García López, M Garczarczyk, S Gasparyan, M Gaug, N Giglietto, F Giordano, P Gliwny, N Godinović, J G Green, D Green, D Hadasch, A Hahn, L Heckmann, J Herrera, J Hoang, D Hrupec, M Hütten, T Inada, S Inoue, K Ishio, Y Iwamura, I Jiménez, J Jormanainen, L Jouvin, Y Kajiwara, M Karjalainen, D Kerszberg, Y Kobayashi, H Kubo, J Kushida, A Lamastra, D Lelas, F Leone, E Lindfors, S Lombardi, F Longo, R López-Coto, M López-Moya, A López-Oramas, S Loporchio, B Machado de Oliveira Fraga, C Maggio, P Majumdar, M Makariev, M Mallamaci, G Maneva, M Manganaro, K Mannheim, L Maraschi, M Mariotti, M Martínez, D Mazin, S Menchiari, S Mender, S Mićanović, D Miceli, T Miener, M Minev, J M Miranda, R Mirzoyan, E Molina, A Moralejo, D Morcuende, V Moreno, E Moretti, V Neustroev, C Nigro, K Nilsson, K Nishijima, K Noda, S Nozaki, Y Ohtani, T Oka, J Otero-Santos, S Paiano, M Palatiello, D Paneque, R Paoletti, J M Paredes, L Pavletić, P Peñil, C Perennes, M Persic, P G Prada Moroni, E Prandini, C Priyadarshi, I Puljak, W Rhode, M Ribó, J Rico, C Righi, A Rugliancich, L Saha, N Sahakyan, T Saito, S Sakurai, K Satalecka, F G Saturni, B Schleicher, K Schmidt, T Schweizer, J Sitarek, I Šnidarić, D Sobczynska, A Spolon, A Stamerra, D Strom, M Strzys, Y Suda, T Surić, M Takahashi, F Tavecchio, P Temnikov, T Terzić, M Teshima, L Tosti, S Truzzi, A Tutone, S Ubach, J van Scherpenberg, G Vanzo, M Vazquez Acosta, S Ventura, V Verguilov, C F Vigorito, V Vitale, I Vovk, M Will, C Wunderlich, D Zarić, E Bissaldi, G Bonnoli, S Cutini, F D’Ammando, A Nabizadeh, A Marchini, M Orienti

    Monthly Notices of the Royal Astronomical Society   507 巻 ( 1 ) 頁： 1528 - 1545   2021年8月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：Oxford University Press (OUP)  

    <title>ABSTRACT</title>
    We report here on the first multiwavelength (MWL) campaign on the blazar TXS 1515–273, undertaken in 2019 and extending from radio to very-high-energy gamma-rays (VHE). Up until now, this blazar had not been the subject of any detailed MWL observations. It has a rather hard photon index at GeV energies and was considered a candidate extreme high-synchrotron-peaked source. MAGIC observations resulted in the first-time detection of the source in VHE with a statistical significance of 7.6σ. The average integral VHE flux of the source is 6 ± 1 per cent of the Crab nebula flux above 400 GeV. X-ray coverage was provided by Swift-XRT, XMM–Newton, and NuSTAR. The long continuous X-ray observations were separated by ∼9 h, both showing clear hour scale flares. In the XMM–Newton data, both the rise and decay time-scales are longer in the soft X-ray than in the hard X-ray band, indicating the presence of a particle cooling regime. The X-ray variability time-scales were used to constrain the size of the emission region and the strength of the magnetic field. The data allowed us to determine the synchrotron peak frequency and classify the source as a flaring high, but not extreme synchrotron-peaked object. Considering the constraints and variability patterns from the X-ray data, we model the broad-band spectral energy distribution. We applied a simple one-zone model, which could not reproduce the radio emission and the shape of the optical emission, and a two-component leptonic model with two interacting components, enabling us to reproduce the emission from radio to VHE band.

    DOI： 10.1093/mnras/stab1994

    その他リンク： http://academic.oup.com/mnras/article-pdf/507/1/1528/39956288/stab1994.pdf

  11. Multiwavelength variability and correlation studies of Mrk 421 during historically low X-ray and gamma-ray activity in 2015-2016 査読有り

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, K. Asano, A. Babic, B. Banerjee, A. Baquero, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, O. Blanch, G. Bonnoli, Z. Bosnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D'Amico, D'Elia, V, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, T. Di Girolamo, F. Di Pierro, L. Di Venere, E. Do Souto Espi Neira, D. Dominis Prester, A. Donini, M. Doro, V. Fallah Ramazani, A. Fattorini, G. Ferrara, L. Foffano, M. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, J. G. Green, D. Green, D. Hadasch, A. Hahn, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Huetten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, J. Jormanainen, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. Lopez, R. Lopez-Coto, A. Lopez-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, L. Maraschi, M. Mariotti, M. Martinez, D. Mazin, S. Mender, S. Micanovic, D. Miceli, T. Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, Moreno, V, E. Moretti, P. Munar-Adrover, Neustroev, V, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletic, P. Penil, C. Perennes, M. Persic, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, Puljak, I, W. Rhode, M. Ribo, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, Snidaric, I, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Suric, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzic, M. Teshima, N. Torres-Alba, L. Tosti, S. Truzzi, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, Vovk, I, M. Will, D. Zaric, A. Arbet-Engels, D. Baack, M. Balbo, M. Beck, N. Biederbeck, A. Biland, T. Bretz, K. Bruegge, J. Buss, D. Dorner, D. Elsaesser, D. Hildebrand, R. Iotov, M. Klinger, K. Mannheim, D. Neise, A. Neronov, M. Noethe, A. Paravac, W. Rhode, Sliusar, V, F. Theissen, R. Walter, J. Valverde, D. Horan, M. Giroletti, M. Perri, F. Verrecchia, C. Leto, A. C. Sadun, J. W. Moody, M. Joner, A. P. Marscher, S. G. Jorstad, A. Lahteenmaki, M. Tornikoski, Ramakrishnan, V, E. Jarvela, R. J. C. Vera, S. Righini, A. Y. Lien

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   504 巻 ( 1 ) 頁： 1427 - 1451   2021年6月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：OXFORD UNIV PRESS  

    We report a characterization of the multiband flux variability and correlations of the nearby (z = 0.031) blazar Markarian 421 (Mrk 421) using data from Metsahovi, Swift, Fermi-LAT, MAGIC, FACT, and other collaborations and instruments from 2014 November till 2016 June. Mrk 421 did not show any prominent flaring activity, but exhibited periods of historically low activity above 1 TeV (F->1 TeV < 1.7 x 10(-12) ph cm(-2) s(-1)) and in the 2-10 keV (X-ray) band (F2-10 keV < 3.6 x 10(-11) erg cm(-2) s(-1)), during which the Swift-BAT data suggest an additional spectral component beyond the regular synchrotron emission. The highest flux variability occurs in X-rays and very high-energy (E > 0.1 TeV) gamma-rays, which, despite the low activity, show a significant positive correlation with no time lag. The HRkeV and HRTeV show the harder-when-brighter trend observed in many blazars, but the trend flattens at the highest fluxes, which suggests a change in the processes dominating the blazar variability. Enlarging our data set with data from years 2007 to 2014, we measured a positive correlation between the optical and the GeV emission over a range of about 60 d centred at time lag zero, and a positive correlation between the optical/GeV and the radio emission over a range of about 60 d centred at a time lag of 43(-6)(+9) d. This observation is consistent with the radio-bright zone being located about 0.2 parsec downstream from the optical/GeV emission regions of the jet. The flux distributions are better described with a lognormal function in most of the energy bands probed, indicating that the variability in Mrk 421 is likely produced by a multiplicative process.

    DOI： 10.1093/mnras/staa3727

    Web of Science

  12. HESS and MAGIC observations of a sudden cessation of a very-high-energy gamma-ray flare in PKS 1510-089 in May 2016 査読有り 国際共著 国際誌

    H. Abdalla, R. Adam, F. Aharonian, F. Ait Benkhali, E. O. Anguner, C. Arcaro, C. Armand, T. Armstrong, H. Ashkar, M. Backes, Baghmanyan, V, V. Barbosa Martins, A. Barnacka, M. Barnard, Y. Becherini, D. Berge, K. Bernlohr, B. Bi, M. Bottcher, C. Boisson, J. Bolmont, S. Bonnefoy, M. de Bony de Lavergne, J. Bregeon, M. Breuhaus, F. Brun, P. Brun, M. Bryan, M. Buchele, T. Bulik, T. Bylund, S. Caroff, A. Carosi, S. Casanova, T. Chand, S. Chandra, A. Chen, G. Cotter, J. Damascene Mbarubucyeye, I. D. Davids, J. Davies, C. Deil, J. Devin, P. DeWilt, L. Dirson, A. Djannati-Atai, A. Dmytriiev, A. Donath, Doroshenko, V, J. Dyks, K. Egberts, F. Eichhorn, S. Einecke, G. Emery, J-P Ernenwein, K. Feijen, S. Fegan, A. Fiasson, G. Fichet de Clairfontaine, M. Filipovic, G. Fontaine, S. Funk, M. Fuling, S. Gabici, Y. A. Gallant, G. Giavitto, L. Giunti, D. Glawion, J. F. Glicenstein, D. Gottschall, M-H Grondin, J. Hahn, M. Haupt, G. Hermann, J. A. Hinton, W. Hofmann, C. Hoischen, T. L. Holch, M. Holler, M. Horbe, D. Horns, D. Huber, M. Jamrozy, D. Jankowsky, F. Jankowsky, A. Jardin-Blicq, Joshi, V, Jung-Richardt, I, M. A. Kastendieck, K. Katarzynski, U. Katz, D. Khangulyan, B. Khelifi, S. Klepser, W. Kluzniak, Nu Komin, R. Konno, K. Kosack, D. Kostunin, M. Kreter, G. Lamanna, A. Lemiere, M. Lemoine-Goumard, J-P Lenain, C. Levy, T. Lohse, Lypova, I, J. Mackey, J. Majumdar, D. Malyshev, D. Malyshev, Marandon, V, P. Marchegiani, A. Marcowith, A. Mares, G. Marti-Devesa, R. Marx, G. Maurin, P. J. Meintjes, M. Meyer, A. M. W. Mitchell, R. Moderski, M. Mohamed, L. Mohrmann, A. Montanari, C. Moore, P. Morris, E. Moulin, J. Muller, T. Murach, K. Nakashima, A. Nayerhoda, M. de Naurois, H. Ndiyavala, F. Niederwanger, D. Niemiec, L. Oakes, P. O'Brien, H. Odaka, S. Ohm, L. Olivera-Nieto, E. de Ona Wilhelmi, M. Ostrowski, M. Panter, S. Panny, R. D. Parsons, G. Peron, B. Peyaud, Q. Piel, S. Pita, Poireau, V, A. Priyana Noel, D. A. Prokhorov, H. Prokoph, G. Puhlhofer, M. Punch, A. Quirrenbach, S. Raab, R. Rauth, P. Reichherzer, A. Reimer, O. Reimer, Q. Remy, M. Renaud, F. Rieger, L. Rinchiuso, C. Romoli, G. Rowell, B. Rudak, E. Ruiz-Velasco, Sahakian, V, S. Sailer, D. A. Sanchez, A. Santangelo, M. Sasaki, M. Scalici, F. Schussler, H. M. Schutte, U. Schwanke, S. Schwemmer, M. Seglar-Arroyo, M. Senniappan, A. S. Seyffert, N. Shafi, K. Shiningayamwe, R. Simoni, A. Sinha, H. Sol, A. Specovius, S. Spencer, L. Sun, R. Steenkamp, C. Stegmann, S. Steinmassl, C. Steppa, T. Takahashi, T. Tavernier, A. M. Taylor, R. Terrier, D. Tiziani, M. Tluczykont, L. Tomankova, C. Trichard, M. Tsirou, R. Tuffs, Y. Uchiyama, D. J. van der Walt, C. van Eldik, C. van Rensburg, B. van Soelen, G. Vasileiadis, J. Veh, C. Venter, P. Vincent, J. Vink, H. J. Volk, T. Vuillaume, Z. Wadiasingh, S. J. Wagner, J. Watson, F. Werner, R. White, A. Wierzcholska, Yu W. Wong, A. Yusafzai, M. Zacharias, R. Zanin, D. Zargaryan, A. A. Zdziarski, A. Zech, S. J. Zhu, J. Zorn, S. Zouari, V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, K. Asano, D. Baack, A. Babic, A. Baquero, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D'Amico, D'Elia, V, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espineira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, L. Foffano, M. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinovic, D. Green, D. Hadasch, A. Hahn, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Hutten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. Lopez, R. Lopez-Coto, A. Lopez-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martinez, D. Mazin, S. Mender, S. Micanovi, D. Miceli, T. Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, Moreno, V, E. Moretti, P. Munar-Adrover, Neustroev, V, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletic, P. Penil, C. Perennes, M. Persic, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, Puljak, I, W. Rhode, M. Ribo, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, Snidaric, I, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Suric, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzic, M. Teshima, N. Torres-Alba, L. Tosti, S. Truzzi, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, Vovk, I, M. Will, D. Zaric, S. G. Jorstad, A. P. Marscher, B. Boccardi, C. Casadio, J. Hodgson, J-Y Kim, T. P. Krichbaum, A. Lahteenmaki, M. Tornikoski, E. Traianou, Z. R. Weaver

    ASTRONOMY & ASTROPHYSICS   648 巻   2021年4月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：EDP SCIENCES S A  

    The flat spectrum radio quasar (FSRQ) PKS 1510-089 is known for its complex multiwavelength behaviour and it is one of only a few FSRQs detected in very-high-energy (VHE, E>100 GeV) gamma rays. The VHE gamma -ray observations with H.E.S.S. and MAGIC in late May and early June 2016 resulted in the detection of an unprecedented flare, which revealed, for the first time, VHE gamma -ray intranight variability for this source. While a common variability timescale of 1.5 h has been found, there is a significant deviation near the end of the flare, with a timescale of similar to 20 min marking the cessation of the event. The peak flux is nearly two orders of magnitude above the low-level emission. For the first time, a curvature was detected in the VHE gamma -ray spectrum of PKS 1510-089, which can be fully explained by the absorption on the part of the extragalactic background light. Optical R-band observations with ATOM revealed a counterpart of the gamma -ray flare, even though the detailed flux evolution differs from the VHE gamma -ray light curve. Interestingly, a steep flux decrease was observed at the same time as the cessation of the VHE gamma -ray flare. In the high-energy (HE, E> 100 MeV) gamma -ray band, only a moderate flux increase was observed with Fermi-LAT, while the HE gamma -ray spectrum significantly hardens up to a photon index of 1.6. A search for broad-line region (BLR) absorption features in the gamma -ray spectrum indicates that the emission region is located outside of the BLR. Radio very-long-baseline interferometry observations reveal a fast-moving knot interacting with a standing jet feature around the time of the flare. As the standing feature is located similar to 50 pc from the black hole, the emission region of the flare may have been located at a significant distance from the black hole. If this is indeed a true correlation, the VHE gamma rays must have been produced far down in the jet, where turbulent plasma crosses a standing shock.

    DOI： 10.1051/0004-6361/202038949

    Web of Science

  13. VHE gamma-ray detection of FSRQ QSO B1420+326 and modeling of its enhanced broadband state in 2020 査読有り

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, M. Artero, K. Asano, D. Baack, A. Babic, A. Baquero, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Z. Bosnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D'Amico, V. D'Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espineira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, L. Foffano, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinovic, J. G. Green, D. Green, D. Hadasch, A. Hahn, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Hutten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, J. Jormanainen, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, R. Lopez-Coto, M. Lopez-Moya, A. Lopez-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martinez, D. Mazin, S. Mender, S. Micanovic, D. Miceli, T. Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, V. Neustroev, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletic, P. Penil, C. Perennes, M. Persic, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, I. Puljak, W. Rhode, M. Ribo, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F. G. Saturni, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I. Snidaric, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Suric, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzic, M. Teshima, N. Torres-Alba, L. Tosti, S. Truzzi, A. Tutone, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, D. Zaric, R. Angioni, F. D'Ammando, S. Ciprini, C. C. Cheung, M. Orienti, L. Pacciani, P. Prajapati, P. Kumar, S. Ganesh, M. Minev, A. Kurtenkov, A. Marchini, L. Carrasco, G. Escobedo, A. Porras, E. Recillas, A. Lahteenmaki, M. Tornikoski, M. Berton, J. Tammi, R. J. C. Vera, S. G. Jorstad, A. P. Marscher, Z. R. Weaver, M. Hart, M. K. Hallum, V. M. Larionov, G. A. Borman, T. S. Grishina, E. N. Kopatskaya, E. G. Larionova, A. A. Nikiforova, D. A. Morozova, S. S. Savchenko, Yu. V. Troitskaya, I. S. Troitsky, A. A. Vasilyev, M. Hodges, T. Hovatta, S. Kiehlmann, W. Max-Moerbeck, A. C. S. Readhead, R. Reeves, T. J. Pearson

    ASTRONOMY & ASTROPHYSICS   647 巻   2021年3月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：EDP SCIENCES S A  

    Context. QSO B1420+326 is a blazar classified as a flat-spectrum radio quasar (FSRQ). At the beginning of the year 2020, it was found to be in an enhanced flux state and an extensive multiwavelength campaign allowed us to trace the evolution of the flare.Aims. We search for very high-energy (VHE) gamma-ray emission from QSO B1420+326 during this flaring state. We aim to characterize and model the broadband emission of the source over different phases of the flare.Methods. The source was observed with a number of instruments in radio, near-infrared, optical (including polarimetry and spectroscopy), ultraviolet, X-ray, and gamma-ray bands. We use dedicated optical spectroscopy results to estimate the accretion disk and the dust torus luminosity. We performed spectral energy distribution modeling in the framework of combined synchrotron-self-Compton and external Compton scenario in which the electron energy distribution is partially determined from acceleration and cooling processes.Results. During the enhanced state, the flux of both SED components of QSO B1420+326 drastically increased and the peaks were shifted to higher energies. Follow-up observations with the MAGIC telescopes led to the detection of VHE gamma-ray emission from this source, making it one of only a handful of FSRQs known in this energy range. Modeling allows us to constrain the evolution of the magnetic field and electron energy distribution in the emission region. The gamma-ray flare was accompanied by a rotation of the optical polarization vector during a low -polarization state. Also, a new superluminal radio knot contemporaneously appeared in the radio image of the jet. The optical spectroscopy shows a prominent FeII bump with flux evolving together with the continuum emission and a MgII line with varying equivalent width.

    DOI： 10.1051/0004-6361/202039687

    Web of Science

  14. MAGIC Observations of the Nearby Short Gamma-Ray Burst GRB 160821B* 査読有り

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, K. Asano, D. Baack, A. Babic, A. Baquero, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Z. Bosnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D'Amico, D'Elia, V, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espineira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, L. Foffano, M. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinovic, J. G. Green, D. Green, D. Hadasch, A. Hahn, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Huetten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, J. Jormanainen, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, R. Lopez-Coto, M. Lopez-Moya, A. Lopez-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martinez, D. Mazin, S. Mender, D. Miceli, T. Miener, S. Micanovic, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, Moreno, V, E. Moretti, Neustroev, V, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletic, P. Penil, C. Perennes, M. Persic, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, Puljak, I, W. Rhode, M. Ribo, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F. G. Saturni, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, Snidaric, I, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Suric, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzic, M. Teshima, N. Torres-Alba, L. Tosti, S. Truzzi, A. Tutone, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, Vovk, I, M. Will, D. Zaric, L. Nava

    ASTROPHYSICAL JOURNAL   908 巻 ( 1 )   2021年2月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IOP PUBLISHING LTD  

    The coincident detection of GW170817 in gravitational waves and electromagnetic radiation spanning the radio to MeV gamma-ray bands provided the first direct evidence that short gamma-ray bursts (GRBs) can originate from binary neutron star (BNS) mergers. On the other hand, the properties of short GRBs in high-energy gamma-rays are still poorly constrained, with only similar to 20 events detected in the GeV band, and none in the TeV band. GRB 160821B is one of the nearest short GRBs known at z = 0.162. Recent analyses of the multiwavelength observational data of its afterglow emission revealed an optical-infrared kilonova component, characteristic of heavy-element nucleosynthesis in a BNS merger. Aiming to better clarify the nature of short GRBs, this burst was automatically followed up with the MAGIC telescopes, starting from 24 s after the burst trigger. Evidence of a gamma-ray signal is found above similar to 0.5 TeV at a significance of similar to 3 sigma during observations that lasted until 4 hr after the burst. Assuming that the observed excess events correspond to gamma-ray emission from GRB 160821B, in conjunction with data at other wavelengths, we investigate its origin in the framework of GRB afterglow models. The simplest interpretation with one-zone models of synchrotron-self-Compton emission from the external forward shock has difficulty accounting for the putative TeV flux. Alternative scenarios are discussed where the TeV emission can be relatively enhanced. The role of future GeV-TeV observations of short GRBs in advancing our understanding of BNS mergers and related topics is briefly addressed.

    DOI： 10.3847/1538-4357/abd249

    Web of Science

  15. Detection of the Geminga pulsar with MAGIC hints at a power-law tail emission beyond 15 GeV 査読有り

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, K. Asano, D. Baack, A. Babić, A. Baquero, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, L. Bellizzi, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D’Amico, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, T. Di Girolamo, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, L. Foffano, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinović, J. G. Green, D. Green, D. Hadasch, A. Hahn, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, J. Jormanainen, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, R. López-Coto, M. López-Moya, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, S. Mender, S. Mićanović, D. Miceli, T. Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, P. Munar-Adrover, V. Neustroev, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletić, P. Peñil, C. Perennes, M. Persic, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F. G. Saturni, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, L. Tosti, S. Truzzi, A. Tutone, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, D. Zarić, K. Hirotani, P. M. Saz Parkinson

    Astronomy & Astrophysics   643 巻   頁： L14 - L14   2020年11月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：EDP Sciences  

    We report the detection of pulsed gamma-ray emission from the Geminga pulsar (PSR J0633+1746) between 15 GeV and 75 GeV. This is the first time a middle-aged pulsar has been detected up to these energies. Observations were carried out with the MAGIC telescopes between 2017 and 2019 using the low-energy threshold Sum-Trigger-II system. After quality selection cuts, ∼80 h of observational data were used for this analysis. To compare with the emission at lower energies below the sensitivity range of MAGIC, 11 years of <italic>Fermi</italic>-LAT data above 100 MeV were also analysed. From the two pulses per rotation seen by <italic>Fermi</italic>-LAT, only the second one, <italic>P</italic>2, is detected in the MAGIC energy range, with a significance of 6.3<italic>σ</italic>. The spectrum measured by MAGIC is well-represented by a simple power law of spectral index Γ = 5.62 ± 0.54, which smoothly extends the <italic>Fermi</italic>-LAT spectrum. A joint fit to MAGIC and <italic>Fermi</italic>-LAT data rules out the existence of a sub-exponential cut-off in the combined energy range at the 3.6<italic>σ</italic> significance level. The power-law tail emission detected by MAGIC is interpreted as the transition from curvature radiation to Inverse Compton Scattering of particles accelerated in the northern outer gap.

    DOI： 10.1051/0004-6361/202039131

    Web of Science

  16. MAGIC observations of the diffuse gamma-ray emission in the vicinity of the Galactic center 査読有り

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, D. Baack, A. Babic, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Z. Bosnjak, G. Busetto, R. Carosi, G. Ceribella, Y. Chai, A. Chilingaryan, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, D'Elia, V, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espineira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, A. Fernandez-Barral, G. Ferrara, D. Fidalgo, L. Foffano, M. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, N. Godinovic, D. Green, D. Guberman, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, M. Hutten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, D. Kerszberg, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. Lopez, R. Lopez-Coto, A. Lopez-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martinez, S. Masuda, D. Mazin, S. Micanovic, D. Miceli, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, Moreno, V, E. Moretti, P. Munar-Adrover, Neustroev, V, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogues, M. Noethe, S. Nozaki, S. Paiano, J. Palacio, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, P. Penil, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, Puljak, I, W. Rhode, M. Ribo, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, K. Schmidt, T. Schweizer, J. Sitarek, Snidaric, I, D. Sobczynska, A. Somero, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Suric, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzic, M. Teshima, N. Torres-Alba, L. Tosti, S. Tsujimoto, V. Vagelli, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, C. F. Vigorito, V. Vitale, Vovk, I, M. Will, D. Zaric

    ASTRONOMY & ASTROPHYSICS   642 巻   2020年10月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：EDP SCIENCES S A  

    Aims. In the presence of a sufficient amount of target material, gamma-rays can be used as a tracer in the search for sources of Galactic cosmic rays (CRs). Here we present deep observations of the Galactic center (GC) region with the MAGIC telescopes and use them to infer the underlying CR distribution and to study the alleged PeV proton accelerator at the center of our Galaxy.Methods. We used data from approximate to 100 h observations of the GC region conducted with the MAGIC telescopes over five years (from 2012 to 2017). Those were collected at high zenith angles (58-70 deg), leading to a larger energy threshold, but also an increased effective collection area compared to low zenith observations. Using recently developed software tools, we derived the instrument response and background models required for extracting the diffuse emission in the region. We used existing measurements of the gas distribution in the GC region to derive the underlying distribution of CRs. We present a discussion of the associated biases and limitations of such an approach.Results. We obtain a significant detection for all four model components used to fit our data (Sgr A*, "Arc", G0.9+0.1, and an extended component for the Galactic Ridge). We observe no significant difference between the gamma-ray spectra of the immediate GC surroundings, which we model as a point source (Sgr A*) and the Galactic Ridge. The latter can be described as a power-law with index 2 and an exponential cut-off at around 20 TeV with the significance of the cut-off being only 2 sigma. The derived cosmic-ray profile hints to a peak at the GC position and with a measured profile index of 1.2 +/- 0.3 is consistent with the 1/r radial distance scaling law, which supports the hypothesis of a CR accelerator at the GC. We argue that the measurements of this profile are presently limited by our knowledge of the gas distribution in the GC vicinity.

    DOI： 10.1051/0004-6361/201936896

    Web of Science

  17. Study of the GeV to TeV morphology of the γ γ -Cygni SNR (G78.2+2.1) with MAGIC and Fermi-LAT 査読有り 国際共著 国際誌

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, D. Baack, A. Babić, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, V. D'Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, L. Foffano, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, R. J, García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinović, D. Green, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. López, R. López-Coto, A. López-Oramas, S. Loporchio, B. Machado, de, Oliveira Fraga, S. Masuda, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, S. Mender, S. Mićanović, D. Miceli, T. Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, P. Munar-Adrover, V. Neustroev, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogués, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletić, P. Peñil, M. Peresano, M. Persic, P. G, Prada Moroni, E. Prandini, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Spolon, A, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, F. Tavecchio, F, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, L. Tosti, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, D. Zarić, S.Celli, G. Morlino

    Astronomy & Astrophysics     2020年10月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    Context. Diffusive shock acceleration (DSA) is the most promising mechanism to accelerate Galactic cosmic rays (CRs) in the shocks of supernova remnants (SNRs). The turbulence upstream is supposedly generated by the CRs, but this process is not well understood. The dominant mechanism may depend on the evolutionary state of the shock and can be studied via the CRs escaping upstream into the interstellar medium (ISM). Aims. Previous observations of the γ
    γ
    -Cygni SNR showed a difference in morphology between GeV and TeV energies. Since this SNR has the right age and is at the evolutionary stage for a significant fraction of CRs to escape, we aim to understand γ
    γ
    -ray emission in the vicinity of the γ
    γ
    -Cygni SNR. Methods. We observed the region of the γ
    γ
    -Cygni SNR with the MAGIC Imaging Atmospheric Cherenkov telescopes between May 2015 and September 2017 recording 87 h of good-quality data. Additionally we analysed Fermi-LAT data to study the energy dependence of the morphology as well as the energy spectrum in the GeV to TeV range. The energy spectra and morphology were compared against theoretical predictions, which include a detailed derivation of the CR escape process and their γ
    γ
    -ray generation. Results. The MAGIC and Fermi-LAT data allowed us to identify three emission regions, which can be associated with the SNR and dominate at different energies. Our hadronic emission model accounts well for the morphology and energy spectrum of all source components. It constrains the time-dependence of the maximum energy of the CRs at the shock, the time-dependence of the level of turbulence, and the diffusion coefficient immediately outside the SNR shock. While in agreement with the standard picture of DSA, the time-dependence of the maximum energy was found to be steeper than predicted and the level of turbulence was found to change over the lifetime of the SNR.

    DOI： 10.48550/arXiv.2010.15854

  18. Studying the nature of the unidentified gamma-ray source HESS J1841−055 with the MAGIC telescopes 査読有り

    V A Acciari, S Ansoldi, L A Antonelli, A Arbet Engels, K Asano, D Baack, A Babić, B Banerjee, A Baquero, U Barres de Almeida, J A Barrio, J Becerra González, W Bednarek, L Bellizzi, E Bernardini, M Bernardos, A Berti, J Besenrieder, W Bhattacharyya, C Bigongiari, A Biland, O Blanch, G Bonnoli, Ž Bošnjak, G Busetto, R Carosi, G Ceribella, M Cerruti, Y Chai, A Chilingarian, S Cikota, S M Colak, E Colombo, J L Contreras, J Cortina, S Covino, G D’Amico, V D’Elia, P Da Vela, F Dazzi, A De Angelis, B De Lotto, M Delfino, J Delgado, C Delgado Mendez, D Depaoli, T Di Girolamo, F Di Pierro, L Di Venere, E Do Souto Espiñeira, D Dominis Prester, A Donini, D Dorner, M Doro, D Elsaesser, V Fallah Ramazani, A Fattorini, G Ferrara, L Foffano, M V Fonseca, L Font, C Fruck, S Fukami, R J García López, M Garczarczyk, S Gasparyan, M Gaug, N Giglietto, F Giordano, P Gliwny, N Godinović, D Green, D Hadasch, A Hahn, L Heckmann, J Herrera, J Hoang, D Hrupec, M Hütten, T Inada, S Inoue, K Ishio, Y Iwamura, L Jouvin, Y Kajiwara, M Karjalainen, D Kerszberg, Y Kobayashi, H Kubo, J Kushida, A Lamastra, D Lelas, F Leone, E Lindfors, S Lombardi, F Longo, M López, R López-Coto, A López-Oramas, S Loporchio, B Machado de Oliveira Fraga, C Maggio, P Majumdar, M Makariev, M Mallamaci, G Maneva, M Manganaro, K Mannheim, L Maraschi, M Mariotti, M Martínez, D Mazin, S Mender, S Mićanović, D Miceli, T Miener, M Minev, J M Miranda, R Mirzoyan, E Molina, A Moralejo, D Morcuende, V Moreno, E Moretti, P Munar-Adrover, V Neustroev, C Nigro, K Nilsson, D Ninci, K Nishijima, K Noda, S Nozaki, Y Ohtani, T Oka, J Otero-Santos, M Palatiello, D Paneque, R Paoletti, J M Paredes, L Pavletić, P Peñil, C Perennes, M Persic, P G Prada Moroni, E Prandini, C Priyadarshi, I Puljak, W Rhode, M Ribó, J Rico, C Righi, A Rugliancich, L Saha, N Sahakyan, T Saito, S Sakurai, K Satalecka, B Schleicher, K Schmidt, T Schweizer, J Sitarek, I Šnidarić, D Sobczynska, A Spolon, A Stamerra, D Strom, M Strzys, Y Suda, T Surić, M Takahashi, F Tavecchio, P Temnikov, T Terzić, M Teshima, N Torres-Albà, L Tosti, S Truzzi, J van Scherpenberg, G Vanzo, M Vazquez Acosta, S Ventura, V Verguilov, C F Vigorito, V Vitale, I Vovk, M Will, D Zarić

    Monthly Notices of the Royal Astronomical Society   497 巻 ( 3 ) 頁： 3734 - 3745   2020年9月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Oxford University Press (OUP)  

    <title>ABSTRACT</title>
    We investigate the physical nature and origin of the gamma-ray emission from the extended source HESS J1841−055 observed at TeV and GeV energies. We observed HESS J1841−055 at TeV energies for a total effective time of 43 h with the MAGIC telescopes, in 2012 and 2013. Additionally, we analysed the GeV counterpart making use of about 10 yr of Fermi-LAT data. Using both Fermi-LAT and MAGIC, we study both the spectral and energy-dependent morphology of the source for almost four decades of energy. The origin of the gamma-ray emission from this region is investigated using multiwaveband information on sources present in this region, suggested to be associated with this unidentified gamma-ray source. We find that the extended emission at GeV–TeV energies is best described by more than one source model. We also perform the first energy-dependent analysis of the HESS J1841−055 region at GeV–TeV. We find that the emission at lower energies comes from a diffuse or extended component, while the major contribution of gamma rays above 1 TeV arises from the southern part of the source. Moreover, we find that a significant curvature is present in the combined observed spectrum of MAGIC and Fermi-LAT. The first multiwavelength spectral energy distribution of this unidentified source shows that the emission at GeV–TeV energies can be well explained with both leptonic and hadronic models. For the leptonic scenario, bremsstrahlung is the dominant emission compared to inverse Compton. On the other hand, for the hadronic model, gamma-ray resulting from the decay of neutral pions (π0) can explain the observed spectrum. The presence of dense molecular clouds overlapping with HESS J1841−055 makes both bremsstrahlung and π0-decay processes the dominant emission mechanisms for the source.

    DOI： 10.1093/mnras/staa2135

    Web of Science

    その他リンク： http://academic.oup.com/mnras/article-pdf/497/3/3734/33660251/staa2135.pdf

  19. An intermittent extreme BL Lac: MWL study of 1ES 2344+514 in an enhanced state 査読有り

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, A. Babic, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, O. Blanch, G. Bonnoli, Z. Bosnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingaryan, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, D'Elia, V, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espineira, D. Dominis Prester, A. Donini, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, L. Foffano, M. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, N. Godinovic, P. Gliwny, D. Green, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, M. Hutten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, Y. Kajiwara, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. Lopez, R. Lopez-Coto, A. Lopez-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, L. Maraschi, M. Mariotti, M. Martinez, D. Mazin, S. Mender, S. Micanovic, D. Miceli, T. Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, Moreno, V, E. Moretti, P. Munar-Adrover, Neustroev, V, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogues, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletic, P. Penil, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, Puljak, I, M. Rib, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, Snidaric, I, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Suric, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzic, M. Teshima, N. Torres-Alba, L. Tosti, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, Vovk, I, M. Will, D. Baack, M. Balbo, M. Beck, N. Biederbeck, A. Biland, M. Blank, T. Bretz, K. Bruegge, M. Bulinski, J. Buss, M. Doerr, D. Dorner, D. Hildebrand, R. Iotov, M. Klinger, K. Mannheim, S. Achim Mueller, D. Neise, A. Neronov, M. Nothe, A. Paravac, W. Rhode, B. Schleicher, K. Sedlaczek, A. Shukla, Sliusar, V, L. Tani, F. Theissen, R. Walter, J. Acosta Pulido, A. Filippenko, T. Hovatta, S. Kiehlmann, V. M. Larionov, W. Max-Moerbeck, C. M. Raiteri, A. C. S. Readhead, M. Segon, M. Villata, W. Zheng

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   496 巻 ( 3 ) 頁： 3912 - 3928   2020年8月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：OXFORD UNIV PRESS  

    Extreme high-frequency BL Lacs (EHBL) feature their synchrotron peak of the broad-band spectral energy distribution (SED) at nu(s) >= 10(17) Hz. The BL Lac object 1ES 2344+514 was included in the EHBL family because of its impressive shift of the synchrotron peak in 1996. During the following years, the source appeared to be in a low state without showing any extreme behaviours. In 2016 August, 1ES 2344+514 was detected with the groundbased gamma-ray telescope FACT during a high gamma-ray state, triggering multiwavelength (MWL) observations. We studied the MWL light curves of 1ES 2344+514 during the 2016 flaring state, using data from radio to very-high-energy (VHE) gamma-rays taken with OVRO, KAIT, KVA, NOT, some telescopes of the GASP-WEBT collaboration at the Teide, Crimean, and St. Petersburg observatories, Swift-UVOT, Swift-XRT, Fermi-LAT, FACT, and MAGIC. With simultaneous observations of the flare, we built the broad-band SED and studied it in the framework of a leptonic and a hadronic model. The VHE gamma-ray observations show a flux level of 55 per cent of the Crab Nebula flux above 300 GeV, similar to the historical maximum of 1995. The combination of MAGIC and Fermi-LAT spectra provides an unprecedented characterization of the inverse-Compton peak for this object during a flaring episode. The Gamma index of the intrinsic spectrum in the VHE gamma-ray band is 2.04 +/- 0.12(stat) +/- 0.15(sys). We find the source in an extreme state with a shift of the position of the synchrotron peak to frequencies above or equal to 1018 Hz.

    DOI： 10.1093/mnras/staa1702

    Web of Science

  20. Testing two-component models on very high-energy gamma-ray-emitting BL Lac objects

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, D. Baack, A. Babić, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D’Amico, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, L. Foffano, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinović, D. Green, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. López, R. López-Coto, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, S. Mender, S. Mićanović, D. Miceli, T. Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, P. Munar-Adrover, V. Neustroev, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogués, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletić, P. Peñil, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, L. Tosti, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, D. Zarić, M. Nievas-Rosillo, C. Arcaro, F. D’ Ammando, F. de Palma, M. Hodges, T. Hovatta, S. Kiehlmann, W. Max-Moerbeck, A. C. S. Readhead, R. Reeves, L. Takalo, R. Reinthal, J. Jormanainen, F. Wierda, S. M. Wagner, A. Berdyugin, A. Nabizadeh, N. Talebpour Sheshvan, A. Oksanen, R. Bachev, A. Strigachev, P. Kehusmaa

    Astronomy & Astrophysics   640 巻   頁： A132 - A132   2020年8月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：EDP Sciences  

    <italic>Context.</italic> It has become evident that one-zone synchrotron self-Compton models are not always adequate for very high-energy (VHE) gamma-ray-emitting blazars. While two-component models perform better, they are difficult to constrain due to the large number of free parameters.


    <italic>Aims.</italic> In this work, we make a first attempt at taking into account the observational constraints from very long baseline interferometry (VLBI) data, long-term light curves (radio, optical, and X-rays), and optical polarisation to limit the parameter space for a two-component model and test whether or not it can still reproduce the observed spectral energy distribution (SED) of the blazars.


    <italic>Methods.</italic> We selected five TeV BL Lac objects based on the availability of VHE gamma-ray and optical polarisation data. We collected constraints for the jet parameters from VLBI observations. We evaluated the contributions of the two components to the optical flux by means of decomposition of long-term radio and optical light curves as well as modelling of the optical polarisation variability of the objects. We selected eight epochs for these five objects based on the variability observed at VHE gamma rays, for which we constructed the SEDs that we then modelled with a two-component model.


    <italic>Results.</italic> We found parameter sets which can reproduce the broadband SED of the sources in the framework of two-component models considering all available observational constraints from VLBI observations. Moreover, the constraints obtained from the long-term behaviour of the sources in the lower energy bands could be used to determine the region where the emission in each band originates. Finally, we attempt to use optical polarisation data to shed new light on the behaviour of the two components in the optical band. Our observationally constrained two-component model allows explanation of the entire SED from radio to VHE with two co-located emission regions.

    DOI： 10.1051/0004-6361/202037811

  21. Bounds on Lorentz Invariance Violation from MAGIC Observation of GRB 190114C 査読有り 国際共著 国際誌

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, D. Baack, A. Babic, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Z. Bosnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D'Amico, D'Elia, V, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espineira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, Fallah Ramazani, V, A. Fattorini, G. Ferrara, L. Foffano, M. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinovic, D. Green, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, M. Huetten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. Lopez, R. Lopez-Coto, A. Lopez-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martinez, D. Mazin, S. Mender, S. Micanovic, D. Miceli, T. Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, Moreno, V, E. Moretti, P. Munar-Adrover, Neustroev, V, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogues, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletic, P. Penil, C. Perennes, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, Puljak, I, W. Rhode, M. Ribo, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, Snidaric, I, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Suric, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzic, M. Teshima, N. Torres-Alba, L. Tosti, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, Vovk, I, M. Will, D. Zaric, L. Nava

    PHYSICAL REVIEW LETTERS   125 巻 ( 2 )   2020年7月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER PHYSICAL SOC  

    On January 14, 2019, the Major Atmospheric Gamma Imaging Cherenkov telescopes detected GRB 190114C above 0.2 TeV, recording the most energetic photons ever observed from a gamma-ray burst. We use this unique observation to probe an energy dependence of the speed of light in vacuo for photons as predicted by several quantum gravity models. Based on a set of assumptions on the possible intrinsic spectral and temporal evolution, we obtain competitive lower limits on the quadratic leading order of speed of light modification.

    DOI： 10.1103/PhysRevLett.125.021301

    Web of Science

  22. A search for dark matter in Triangulum II with the MAGIC telescopes 査読有り 国際共著 国際誌

    V.A. Acciari, S. Ansoldi, L.A. Antonelli, A. Arbet Engels, D. Baack, A. Babić, B. Banerjee, U. Barres de Almeida, J.A. Barrio, J. Becerra González, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, Y. Chai, A. Chilingarian, S. Cikota, S.M. Colak, U. Colin, E. Colombo, J.L. Contreras, J. Cortina, S. Covino, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, D. Fidalgo, L. Foffano, M.V. Fonseca, L. Font, C. Fruck, S. Fukami, R.J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinović, D. Green, J.G. Green, D. Guberman, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, D. Kerszberg, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. López, R. López-Coto, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, S. Mićanović, D. Miceli, T. Miener, M. Minev, J.M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, P. Munar-Adrover, V. Neustroev, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogués, S. Nozaki, S. Paiano, J. Palacio, M. Palatiello, D. Paneque, R. Paoletti, J.M. Paredes, P. Peñil, M. Peresano, M. Persic, P.G. Prada Moroni, E. Prandini, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F.G. Saturni, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Somero, A. Stamerra, D. Strom, Y. Suda, T. Surić, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, L. Tosti, V. Vagelli, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, C.F. Vigorito, V. Vitale, I. Vovk, M. Will, D. Zarić

    Physics of the Dark Universe   28 巻   頁： 100529 - 100529   2020年5月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

    DOI： 10.1016/j.dark.2020.100529

  23. The readout system based on the ultra-fast waveform sampler DRS4 for the Large-Sized Telescope of the Cherenkov Telescope Array

    S. Nozaki, O. Blanch, C. Delgado, P. Gliwny, D. Hadasch, Y. Inome, H. Katagiri, H. Kubo, Y. Kobayashi, D. Mazin, A. Moralejo, Y. Nogami, R. Paoletti, T. Saito, S. Sakurai, J. Sitarek, M. Takahashi, M. Teshima, T. Yamamoto

    Journal of Physics: Conference Series   1468 巻 ( 1 )   2020年3月

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    記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：Institute of Physics Publishing  

    The Cherenkov Telescope Array (CTA) is the next-generation ground-based very- high-energy gamma-ray observatory. By using three types of telescopes CTA can cover a wide energy range (20 GeV{300TeV) with an order of magnitude higher sensitivity than the current telescopes. The Large-Sized Telescope (LST) is designed to detect 20 GeV{1TeV gamma rays thanks to the large light collection area, sensitive photosensors, a fast trigger system, and readout electronics. The camera readout system must have a high signal-to-noise ratio and a linear signal sampling with a large dynamic range in order to efficiently detect dim and low- energy atmospheric showers. To meet this requirement we use the Domino Ring Sampler version 4 (DRS4), which also enables ultra-fast sampling with low power consumption. Some of the intrinsic characteristics of DRS4 chips require software corrections. These procedures lower the effect of non-Gaussian noise contribution and improve the timing resolution of the system. In this contribution we discuss the calibration algorithms and the resulting performance.

    DOI： 10.1088/1742-6596/1468/1/012104

    Scopus

  24. MAGIC very large zenith angle observations of the Crab Nebula up to 100 TeV

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, D. Baack, A. Babić, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, Y. Chai, A. Chilingaryan, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, D. Fidalgo, L. Foffano, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, N. Godinović, D. Green, D. Guberman, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, D. Kerszberg, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. López, R. López-Coto, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, S. Mićanović, D. Miceli, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, P. Munar-Adrover, V. Neustroev, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogués, S. Nozaki, S. Paiano, J. Palacio, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, P. Peñil, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Somero, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, L. Tosti, V. Vagelli, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, D. Zarić

    Astronomy & Astrophysics   635 巻   頁： A158 - A158   2020年3月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：EDP Sciences  

    <italic>Aims.</italic> We measure the Crab Nebula <italic>γ</italic>-ray spectral energy distribution in the ~100 TeV energy domain and test the validity of existing leptonic emission models at these high energies.


    <italic>Methods.</italic> We used the novel very large zenith angle observations with the MAGIC telescope system to increase the collection area above 10 TeV. We also developed an auxiliary procedure of monitoring atmospheric transmission in order to assure proper calibration of the accumulated data. This employs recording optical images of the stellar field next to the source position, which provides a better than 10% accuracy for the transmission measurements.


    <italic>Results.</italic> We demonstrate that MAGIC very large zenith angle observations yield a collection area larger than a square kilometer. In only ~ 56 h of observations, we detect the <italic>γ</italic>-ray emission from the Crab Nebula up to 100 TeV, thus providing the highest energy measurement of this source to date with Imaging Atmospheric Cherenkov Telescopes. Comparing accumulated and archival MAGIC and <italic>Fermi</italic>/LAT data with some of the existing emission models, we find that none of them provides an accurate description of the 1 GeV to 100 TeV <italic>γ</italic>-ray signal.

    DOI： 10.1051/0004-6361/201936899

  25. New Hard-TeV Extreme Blazars Detected with the MAGIC Telescopes 査読有り

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, K. Asano, D. Baack, A. Babić, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingaryan, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, D. Fidalgo, L. Foffano, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, N. Godinović, D. Green, D. Guberman, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, D. Kerszberg, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. López, R. López-Coto, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, S. Mićanović, D. Miceli, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, P. Munar-Adrover, V. Neustroev, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogués, S. Nozaki, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, P. Peñil, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Somero, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, L. Tosti, V. Vagelli, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, D. Zarić, C. Arcaro, A. Carosi, F. D’Ammando, F. Tombesi, A. Lohfink

    The Astrophysical Journal Supplement Series   247 巻 ( 1 ) 頁： 16 - 16   2020年2月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Astronomical Society  

    Extreme high-frequency-peaked BL Lac objects (EHBLs) are blazars that exhibit extremely energetic synchrotron emission. They also feature nonthermal gamma-ray emission whose peak lies in the very high-energy (VHE, E > 100 GeV) range, and in some sources exceeds 1 TeV: this is the case for hard-TeV EHBLs such as 1ES 0229+200. With the aim of increasing the EHBL population, 10 targets were observed with the MAGIC telescopes from 2010 to 2017, for a total of 265 hr of good-quality data. The data were complemented by coordinated Swift observations. The X-ray data analysis confirms that all but two sources are EHBLs. The sources show only a modest variability and a harder-when-brighter behavior, typical for this class of objects. At VHE gamma-rays, three new sources were detected and a hint of a signal was found for another new source. In each case, the intrinsic spectrum is compatible with the hypothesis of a hard-TeV nature of these EHBLs. The broadband spectral energy distributions (SEDs) of all sources are built and modeled in the framework of a single-zone, purely leptonic model. The VHE gamma-ray-detected sources were also interpreted with a spine-layer model and a proton synchrotron model. The three models provide a good description of the SEDs. However, the resulting parameters differ substantially in the three scenarios, in particular the magnetization parameter. This work presents the first mini catalog of VHE gamma-ray and multiwavelength observations of EHBLs.

    DOI： 10.3847/1538-4365/ab5b98

    Web of Science

    その他リンク： https://iopscience.iop.org/article/10.3847/1538-4365/ab5b98

  26. Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-energy Emission from Prompt to Afterglow 査読有り 国際共著 国際誌

    M. Ajello, M. Arimoto, M. Axelsson, L. Baldini, G. Barbiellini, D. Bastieri, R. Bellazzini, A. Berretta, E. Bissaldi, R. D. Blandford, R. Bonino, E. Bottacini, J. Bregeon, P. Bruel, R. Buehler, E. Burns, S. Buson, R. A. Cameron, R. Caputo, P. A. Caraveo, E. Cavazzuti, S. Chen, G. Chiaro, S. Ciprini, J. Cohen-Tanugi, D. Costantin, S. Cutini, F. D'Ammando, M. Deklotz, P. De La Torre Luque, F. De Palma, A. Desai, N. Di Lalla, L. Di Venere, F. Fana Dirirsa, S. J. Fegan, A. Franckowiak, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, R. Gill, F. Giordano, M. Giroletti, J. Granot, D. Green, I. A. Grenier, M. H. Grondin, S. Guiriec, E. Hays, D. Horan, G. Jóhannesson, D. Kocevski, M. Kovac'Evic', M. Kuss, S. Larsson, L. Latronico, M. Lemoine-Goumard, J. Li, I. Liodakis, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, S. Maldera, D. Malyshev, A. Manfreda, G. Martí-Devesa, M. N. Mazziotta, J. E. McEnery, I. Mereu, M. Meyer, P. F. Michelson, W. Mitthumsiri, T. Mizuno, M. E. Monzani, E. Moretti, A. Morselli, I. V. Moskalenko, M. Negro, E. Nuss, N. Omodei, M. Orienti, E. Orlando, M. Palatiello, V. S. Paliya, D. Paneque, Z. Pei, M. Persic, M. Pesce-Rollins, V. Petrosian, F. Piron, H. Poon, T. A. Porter, G. Principe, J. L. Racusin, S. Rain, R. Rando, B. Rani, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, F. Ryde, P. M. Saz Parkinson, D. Serini, C. Sgr, E. J. Siskind, G. Spandre, P. Spinelli, H. Tajima, K. Takagi, M. N. Takahashi, D. Tak, J. B. Thayer, D. J. Thompson, D. F. Torres, E. Troja, J. Valverde, B. Van Klaveren, K. Wood, M. Yassine, G. Zaharijas, B. Mailyan, P. N. Bhat, M. S. Briggs, W. Cleveland, M. Giles, A. Goldstein, M. Hui, Christian Malacaria, R. Preece, O. J. Roberts, P. Veres, C. Wilson-Hodge, A. Von Kienlin, S. B. Cenko, P. O'Brien, A. P. Beardmore, A. Lien, J. P. Osborne, A. Tohuvavohu, V. D'Elia, A. D'A, M. Perri, J. Gropp, N. Klingler, M. Capalbi, G. Tagliaferri, M. Stamatikos, M. De Pasquale

    Astrophysical Journal   890 巻 ( 1 )   2020年2月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Institute of Physics Publishing  

    We report on the observations of gamma-ray burst (GRB) 190114C by the Fermi Gamma-ray Space Telescope and the Neil Gehrels Swift Observatory. The prompt gamma-ray emission was detected by the Fermi GRB Monitor (GBM), the Fermi Large Area Telescope (LAT), and the Swift Burst Alert Telescope (BAT) and the long-lived afterglow emission was subsequently observed by the GBM, LAT, Swift X-ray Telescope (XRT), and Swift UV Optical Telescope. The early-time observations reveal multiple emission components that evolve independently, with a delayed power-law component that exhibits significant spectral attenuation above 40 MeV in the first few seconds of the burst. This power-law component transitions to a harder spectrum that is consistent with the afterglow emission observed by the XRT at later times. This afterglow component is clearly identifiable in the GBM and BAT light curves as a slowly fading emission component on which the rest of the prompt emission is superimposed. As a result, we are able to observe the transition from internal-shock- to external-shock-dominated emission. We find that the temporal and spectral evolution of the broadband afterglow emission can be well modeled as synchrotron emission from a forward shock propagating into a wind-like circumstellar environment. We estimate the initial bulk Lorentz factor using the observed high-energy spectral cutoff. Considering the onset of the afterglow component, we constrain the deceleration radius at which this forward shock begins to radiate in order to estimate the maximum synchrotron energy as a function of time. We find that even in the LAT energy range, there exist high-energy photons that are in tension with the theoretical maximum energy that can be achieved through synchrotron emission from a shock. These violations of the maximum synchrotron energy are further compounded by the detection of very high-energy (VHE) emission above 300 GeV by MAGIC concurrent with our observations. We conclude that the observations of VHE photons from GRB 190114C necessitates either an additional emission mechanism at very high energies that is hidden in the synchrotron component in the LAT energy range, an acceleration mechanism that imparts energy to the particles at a rate that is faster than the electron synchrotron energy-loss rate, or revisions of the fundamental assumptions used in estimating the maximum photon energy attainable through the synchrotron process.

    DOI： 10.3847/1538-4357/ab5b05

    Scopus

  27. Testing emission models on the extreme blazar 2WHSP J073326.7+515354 detected at very high energies with the MAGIC telescopes

    V A Acciari, S Ansoldi, L A Antonelli, A Arbet Engels, D Baack, A Babić, B Banerjee, U Barres de Almeida, J A Barrio, J Becerra González, W Bednarek, L Bellizzi, E Bernardini, A Berti, J Besenrieder, W Bhattacharyya, C Bigongiari, A Biland, O Blanch, G Bonnoli, Ž Bošnjak, G Busetto, R Carosi, G Ceribella, M Cerruti, Y Chai, A Chilingaryan, S Cikota, S M Colak, U Colin, E Colombo, J L Contreras, J Cortina, S Covino, V D’Elia, P Da Vela, F Dazzi, A De Angelis, B De Lotto, M Delfino, J Delgado, D Depaoli, F Di Pierro, L Di Venere, E Do Souto Espiñeira, D Dominis Prester, A Donini, D Dorner, M Doro, D Elsaesser, V Fallah Ramazani, A Fattorini, G Ferrara, D Fidalgo, L Foffano, M V Fonseca, L Font, C Fruck, S Fukami, R J García López, M Garczarczyk, S Gasparyan, M Gaug, N Giglietto, F Giordano, N Godinović, D Green, D Guberman, D Hadasch, A Hahn, J Herrera, J Hoang, D Hrupec, M Hütten, T Inada, S Inoue, K Ishio, Y Iwamura, L Jouvin, D Kerszberg, H Kubo, J Kushida, A Lamastra, D Lelas, F Leone, E Lindfors, S Lombardi, F Longo, M López, R López-Coto, A López-Oramas, S Loporchio, B Machado de Oliveira Fraga, C Maggio, P Majumdar, M Makariev, M Mallamaci, G Maneva, M Manganaro, K Mannheim, L Maraschi, M Mariotti, M Martínez, D Mazin, S Mićanović, D Miceli, M Minev, J M Miranda, R Mirzoyan, E Molina, A Moralejo, D Morcuende, V Moreno, E Moretti, P Munar-Adrover, V Neustroev, C Nigro, K Nilsson, D Ninci, K Nishijima, K Noda, L Nogués, S Nozaki, S Paiano, J Palacio, M Palatiello, D Paneque, R Paoletti, J M Paredes, P Peñil, M Peresano, M Persic, P G Prada Moroni, E Prandini, I Puljak, W Rhode, M Ribó, J Rico, C Righi, A Rugliancich, L Saha, N Sahakyan, T Saito, S Sakurai, K Satalecka, K Schmidt, T Schweizer, J Sitarek, I Šnidarić, D Sobczynska, A Somero, A Stamerra, D Strom, M Strzys, Y Suda, T Surić, M Takahashi, F Tavecchio, P Temnikov, T Terzić, M Teshima, N Torres-Albà, L Tosti, V Vagelli, J van Scherpenberg, G Vanzo, M Vazquez Acosta, C F Vigorito, V Vitale, I Vovk, M Will, D Zarić, K Asano, F D’Ammando, R Clavero

    Monthly Notices of the Royal Astronomical Society   490 巻 ( 2 ) 頁： 2284 - 2299   2019年12月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：Oxford University Press (OUP)  

    <title>ABSTRACT</title>
    Extreme high-energy-peaked BL Lac objects (EHBLs) are an emerging class of blazars. Their typical two-hump-structured spectral energy distribution (SED) peaks at higher energies with respect to conventional blazars. Multiwavelength (MWL) observations constrain their synchrotron peak in the medium to hard X-ray band. Their gamma-ray SED peaks above the GeV band, and in some objects it extends up to several TeV. Up to now, only a few EHBLs have been detected in the TeV gamma-ray range. In this paper, we report the detection of the EHBL 2WHSP J073326.7+515354, observed and detected during 2018 in TeV gamma rays with the MAGIC telescopes. The broad-band SED is studied within an MWL context, including an analysis of the Fermi-LAT data over 10 yr of observation and with simultaneous Swift-XRT, Swift-UVOT, and KVA data. Our analysis results in a set of spectral parameters that confirms the classification of the source as an EHBL. In order to investigate the physical nature of this extreme emission, different theoretical frameworks were tested to model the broad-band SED. The hard TeV spectrum of 2WHSP J073326.7+515354 sets the SED far from the energy equipartition regime in the standard one-zone leptonic scenario of blazar emission. Conversely, more complex models of the jet, represented by either a two-zone spine-layer model or a hadronic emission model, better represent the broad-band SED.

    DOI： 10.1093/mnras/stz2725

    その他リンク： http://academic.oup.com/mnras/article-pdf/490/2/2284/30257402/stz2725.pdf

  28. Observation of inverse Compton emission from a long γ-ray burst

    P. Veres, P. N. Bhat, M. S. Briggs, W. H. Clevel, R. Hamburg, C. M. Hui, B. Mailyan, R. D. Preece, O. J. Roberts, A. von Kienlin, C. A. Wilson-Hodge, D. Kocevski, M. Arimoto, D. Tak, K. Asano, M. Axelsson, G. Barbiellini, E. Bissaldi, F. Fana Dirirsa, R. Gill, J. Granot, J. McEnery, N. Omodei, S. Razzaque, F. Piron, J. L. Racusin, D. J. Thompson, S. Campana, M. G. Bernardini, N. P. M. Kuin, M. H. Siegel, S. B. Cenko, P. O'Brien, M. Capalbi, A. Da{\`{\i } }, M. De Pasquale, J. Gropp, N. Klingler, J. P. Osborne, M. Perri, R. L. C. Starling, G. Tagliaferri, A. Tohuvavohu, A. Ursi, M. Tavani, M. Cardillo, C. Casentini, G. Piano, Y. Evangelista, F. Verrecchia, C. Pittori, F. Lucarelli, A. Bulgarelli, N. Parmiggiani, G. E. Anderson, J. P. Anderson, G. Bernardi, J. Bolmer, M. D. Caballero-Garc{\'{\i } }a, I. M. Carrasco, A. Castell{\'{o } }n, N. Castro Segura, A. J. Castro-Tirado, S. V. Cherukuri, A. M. Cockeram, P. D'Avanzo, A. Di Dato, R. Diretse, R. P. Fender, E. Fern{\'{a } }ndez-Garc{\'{\i } }a, J. P. U. Fynbo, A. S. Fruchter, J. Greiner, M. Gromadzki, K. E. Heintz, I. Heywood, A. J. van der Horst, Y.-D. Hu, C. Inserra, L. Izzo, V. Jaiswal, P. Jakobsson, J. Japelj, E. Kankare, D. A. Kann, C. Kouveliotou, S. Klose, A. J. Levan, X. Y. Li, S. Lotti, K. Maguire, D. B. Malesani, I. Manulis, M. Marongiu, S. Martin, A. Mel, ri, M. J. Micha{\l}owski, J. C. A. Miller-Jones, K. Misra, A. Moin, K. P. Mooley, S. Nasri, M. Nicholl, A. Noschese, G. Novara, S. B. P, ey, E. Peretti, C. J. P{\'{e } }rez del Pulgar, M. A. P{\'{e } }rez-Torres, D. A. Perley, L. Piro, F. Ragosta, L. Resmi, R. Ricci, A. Rossi, R. S{\'{a } }nchez-Ram{\'{\i } }rez, J. Selsing, S. Schulze, S. J. Smartt, I. A. Smith, V. V. Sokolov, J. Stevens, N. R. Tanvir, C. C. Thöne, A. Tiengo, E. Tremou, E. Troja, A. de Ugarte Postigo, A. F. Valeev, S. D. Vergani, M. Wieringa, P. A. Woudt, D. Xu, O. Yaron, D. R. Young

    Nature   575 巻 ( 7783 ) 頁： 459 - 463   2019年11月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media {LLC}  

    DOI： 10.1038/s41586-019-1754-6

  29. Teraelectronvolt emission from the gamma-ray burst GRB 190114C 査読有り

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, D. Baack, A. Babic, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Z. Bosnjak, G. Busetto, A. Carosi, R. Carosi, G. Ceribella, Y. Chai, A. Chilingaryan, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D'Amico, D'Elia, V, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espineira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, A. Fernandez-Barral, G. Ferrara, D. Fidalgo, L. Foffano, M. Fonseca, L. Font, C. Fruck, S. Fukami, S. Gallozzi, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, N. Godinovic, D. Green, D. Guberman, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, M. Huetten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, D. Kerszberg, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. Lopez, R. Lopez-Coto, A. Lopez-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martinez, S. Masuda, D. Mazin, S. Micanovic, D. Miceli, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, Moreno, V, E. Moretti, P. Munar-Adrover, Neustroev, V, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogues, M. Noethe, S. Nozaki, S. Paiano, J. Palacio, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, P. Penil, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, Puljak, I, W. Rhode, M. Ribo, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, K. Schmidt, T. Schweizer, J. Sitarek, Snidaric, I, D. Sobczynska, A. Somero, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Suric, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzic, M. Teshima, N. Torres-Alba, L. Tosti, S. Tsujimoto, V. Vagelli, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, C. F. Vigorito, V. Vitale, Vovk, I, M. Will, D. Zaric, L. Nava

    NATURE   575 巻 ( 7783 ) 頁： 455 - +   2019年11月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：NATURE RESEARCH  

    Long-duration gamma-ray bursts (GRBs) are the most luminous sources of electromagnetic radiation known in the Universe. They arise from outflows of plasma with velocities near the speed of light that are ejected by newly formed neutron stars or black holes (of stellar mass) at cosmological distances(1,2). Prompt flashes of megaelectronvoltenergy gamma-rays are followed by a longer-lasting afterglow emission in a wide range of energies (from radio waves to gigaelectronvolt gamma-rays), which originates from synchrotron radiation generated by energetic electrons in the accompanying shock waves(3,4). Although emission of gamma-rays at even higher (teraelectronvolt) energies by other radiation mechanisms has been theoretically predicted(5-8), it has not been previously detected(7,8). Here we report observations of teraelectronvolt emission from the gamma-ray burst GRB 190114C. gamma-rays were observed in the energy range 0.2-1 teraelectronvolt from about one minute after the burst (at more than 50 standard deviations in the first 20 minutes), revealing a distinct emission component of the afterglow with power comparable to that of the synchrotron component. The observed similarity in the radiated power and temporal behaviour of the teraelectronvolt and X-ray bands points to processes such as inverse Compton upscattering as the mechanism of the teraelectronvolt emission(9-11). By contrast, processes such as synchrotron emission by ultrahigh-energy protons(10,12,13) are not favoured because of their low radiative efficiency. These results are anticipated to be a step towards a deeper understanding of the physics of GRBs and relativistic shock waves.

    DOI： 10.1038/s41586-019-1750-x

    Web of Science

  30. Constraints on Gamma-Ray and Neutrino Emission from NGC 1068 with the MAGIC Telescopes

    V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, D. Baack, A. Babić, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, G. Ceribella, Y. Chai, A. Chilingaryan, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, D. Fidalgo, L. Foffano, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, N. Godinović, D. Green, D. Guberman, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, D. Kerszberg, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. López, R. López-Coto, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, S. Mićanović, D. Miceli, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, P. Munar-Adrover, V. Neustroev, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogués, S. Nozaki, S. Paiano, J. Palacio, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, P. Peñil, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Somero, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Surić, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, L. Tosti, V. Vagelli, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, C. F. Vigorito, V. Vitale, I. Vovk, M. Will, D. Zarić, F. Fiore, C. Feruglio, Y. Rephaeli

    The Astrophysical Journal   883 巻 ( 2 ) 頁： 135 - 135   2019年9月

    　詳細を見る

    掲載種別：研究論文（学術雑誌）   出版者・発行元：American Astronomical Society  

    DOI： 10.3847/1538-4357/ab3a51

    その他リンク： https://iopscience.iop.org/article/10.3847/1538-4357/ab3a51

  31. The calibration of the first large-sized telescope of the Cherenkov telescope array

    S. Sakurai, D. Depaoli, R. López-Coto, J. Becerra González, A. Berti, O. Blanch, F. Cassol, A. Chiavassa, D. Corti, A. de Angelis, C. Delgado, C. Díaz, F. Di Pierro, L. Di Venere, M. Doro, A. Fernández-Barral, F. Giordano, S. Griffiths, D. Hadasch, Y. Inome, L. Jouvin, D. Kerszberg, H. Kubo, A. López-Oramas, M. Mallamaci, M. Mariotti, G. Martínez, S. Masuda, D. Mazin, A. Moralejo, E. Moretti, T. Nagayoshi, D. Ninci, L. Nogués, S. Nozaki, A. Okumura, R. Paoletti, P. Penil, R. Pillera, C. Pio, R. Rando, F. Rotondo, A. Rugliancich, T. Saito, Y. Sunada, M. Suzuki, M. Takahashi, L. A. Tejedor, P. Vallania, C. Vigorito, T. Yamamoto, T. Yoshida, for the CTA Consortium

    Proceedings of Science   358 巻   2019年

    　詳細を見る

    記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：Sissa Medialab Srl  

    The Cherenkov Telescope Array (CTA) represents the next generation of very high-energy gamma-ray observatory, which will provide broad coverage of gamma rays from 20 GeV to 300 TeV with unprecedented sensitivity. CTA will employ three different sizes of telescopes, and the Large-Sized Telescopes (LSTs) of 23-m diameter dish will provide the sensitivity in the lowest energies down to 20 GeV. The first LST prototype has been inaugurated in October 2018 at La Palma (Canary Islands, Spain) and has entered the commissioning phase. The camera of the LST consists of 265 PMT modules. Each module is equipped with seven high-quantum-efficiency Photomultiplier Tubes (PMTs), a slow control board, and a readout board. Ensuring high uniformity and precise characterization of the camera is the key aspects leading to the best performance and low systematic uncertainty of the LST cameras. Therefore, prior to the installation on site, we performed a quality check of all PMT modules. Moreover, the absolute calibration of light throughput is essential to reconstruct the amount of light received by the telescope. The amount of light is affected by the atmosphere, by the telescope optical system and camera, and can be calibrated using the ring-shaped images produced by cosmic-ray muons. In this contribution, we will show the results of off-site quality control of PMT modules and on-site calibration using muon rings. We will also highlight the status of the development of Silicon Photomultiplier modules that could be considered as a replacement of PMT modules for further improvement of the camera.

    Scopus

  32. Limits on the flux of tau neutrinos from 1 PeV to 3 EeV with the MAGIC telescopes 査読有り

    M. L. Ahnen, S. Ansoldi, L. A. Antonelli, C. Arcaro, D. Baack, A. Babić, B. Banerjee, P. Bangale, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, E. Bernardini, R.Ch. Berse, A. Berti, W. Bhattacharyya, A. Biland, O. Blanch, G. Bonnoli, R. Carosi, A. Carosi, G. Ceribella, A. Chatterjee, S. M. Colak, P. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, P. Cumani, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, F. Di Pierro, A. Domínguez, D. Dominis Prester, D. Dorner, M. Doro, S. Einecke, D. Elsaesser, V. Fallah Ramazani, A. Fernández-Barral, D. Fidalgo, M. V. Fonseca, L. Font, C. Fruck, D. Galindo, R. J. García López, M. Garczarczyk, M. Gaug, P. Giammaria, N. Godinović, D. Góra, D. Guberman, D. Hadasch, A. Hahn, T. Hassan, M. Hayashida, J. Herrera, J. Hose, D. Hrupec, K. Ishio, Y. Konno, H. Kubo, J. Kushida, D. Kuveždić, D. Lelas, E. Lindfors, S. Lombardi, F. Longo, M. López, C. Maggio, P. Majumdar, M. Makariev, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, S. Masuda, D. Mazin, K. Mielke, M. Minev, J. M. Miranda, R. Mirzoyan, A. Moralejo, V. Moreno, E. Moretti, T. Nagayoshi, V. Neustroev, A. Niedzwiecki, M. Nievas Rosillo, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogués, S. Paiano, J. Palacio, D. Paneque, R. Paoletti, J. M. Paredes, G. Pedaletti, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, I. Puljak, J. R. Garcia, I. Reichardt, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, T. Saito, K. Satalecka, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Stamerra, M. Strzys, T. Surić, M. Takahashi, L. Takalo, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, A. Treves, S. Tsujimoto, G. Vanzo, M. Vazquez Acosta, I. Vovk, J. E. Ward, M. Will, D. Zarić

    Astroparticle Physics   102 巻   頁： 77 - 88   2018年11月

    　詳細を見る

    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier B.V.  

    A search for tau neutrino induced showers with the MAGIC telescopes is presented. The MAGIC telescopes located at an altitude of 2200 m a.s.l. in the Canary Island of La Palma, can point towards the horizon or a few degrees below across an azimuthal range of about 80°. This provides a possibility to search for air showers induced by tau leptons arising from interactions of tau neutrinos in the Earth crust or the surrounding ocean. In this paper we show how such air showers can be discriminated from the background of very inclined hadronic showers by using Monte Carlo simulations. Taking into account the orography of the site, the point source acceptance and the event rates expected have been calculated for a sample of generic neutrino fluxes from photo-hadronic interactions in AGNs. The analysis of about 30 h of data taken towards the sea leads to a 90% C.L. point source limit for tau neutrinos in the energy range from 1.0 × 1015 eV to 3.0 × 1018 eV of about Eντ 2×ϕ(Eντ )&lt
    2.0×10−4 GeV cm−2 s−1 for an assumed power-law neutrino spectrum with spectral index γ=−2. However, with 300 h and in case of an optimistic neutrino flare model, limits of the level down to Eντ 2×ϕ(Eντ )&lt
    8.4×10−6 GeV cm−2 s−1 can be expected.

    DOI： 10.1016/j.astropartphys.2018.05.002

    Web of Science

    Scopus

  33. Gamma-ray flaring activity of NGC 1275 in 2016-2017 measured by MAGIC 国際共著 国際誌

    MAGIC collaboration, S. Ansoldi, L. A. Antonelli, C. Arcaro, D. Baack, A. Babić, B. Banerjee, P. Bangale, U. Barres, de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, E. Bernardini, R. Ch. Berse, A. Berti, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, R. Carosi, G. Ceribella, A. Chatterjee, S. M. Colak, P. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, P. Cumani, V. D'Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, F. Di Pierro, A. Domínguez, D. Dominis Prester, D. Dorner, M. Doro, S. Einecke, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, A. Fernández-Barral, G. Ferrara, D. Fidalgo, L. Foffano, M. V. Fonseca, L. Font, C. Fruck, D. Galindo, S. Gallozzi, R. J, García López, M. Garczarczyk, M. Gaug, P. Giammaria, N. Godinović, D. Gora, D. Guberman, D. Hadasch, A. Hahn, T. Hassan, M. Hayashida, J. Herrera, J. Hoang, J. Hose, D. Hrupec, K. Ishio, Y. Konno, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. López, C. Maggio, P. Majumdar, M. Makariev, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, S. Masuda, D. Mazin, K. Mielke, M. Minev, J. M. Miranda, R. Mirzoyan, A. Moralejo, V. Moreno, E. Moretti, T. Nagayoshi, V. Neustroev, A. Niedzwiecki, M. Nievas Rosillo, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogués, S. Paiano, J. Palacio, D. Paneque, R. Paoletti, J. M. Paredes, G. Pedaletti, P. Peñil, M. Peresano, M. Persic, K. Pfrang, P. G, Prada Moroni, E. Prandini, I. Puljak, J. R. Garcia, I. Reichardt, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, T. Saito, K. Satalecka, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Stamerra, M. Strzys, T. Surić, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, S. Tsujimoto, G. Vanzo, M. Vazquez Acosta, I. Vovk, J. E. Ward, M. Will, D. Zarić, D. Glawion, L. O. Takalo, J. Jormanainen

    A&A 617, A91 (2018)     2018年6月

    　詳細を見る

    掲載種別：研究論文（学術雑誌）  

    We report on the detection of flaring activity from the Fanaroff-Riley I<br />
    radio galaxy NGC 1275 in very-high-energy (VHE, E $&gt;$ 100 GeV) gamma rays with<br />
    the MAGIC telescopes. Observations were performed between 2016 September and<br />
    2017 February as part of a monitoring program. The brightest outburst with<br />
    $\sim1.5$ times the Crab Nebula flux above 100 GeV (C.U.) was observed during<br />
    the night between 2016 December 31 and 2017 January 1 (fifty times higher than<br />
    the mean previously measured in two observational campaigns between 2009 and<br />
    2011). Significant variability of the day-by-day light curve was measured, the<br />
    shortest flux-doubling time-scales was found to be of $(611\pm101)$ min. The<br />
    combined spectrum of the MAGIC data during the strongest flare state and<br />
    simultaneous data from the Fermi-LAT around 2017 January 1 follows a power-law<br />
    with an exponential cutoff at the energy $(492\pm35)$ GeV. Simultaneous optical<br />
    flux density measurements in the R-band obtained with the KVA telescope are<br />
    also presented and the correlation between the optical and gamma-ray emission<br />
    is investigated. Due to possible internal pair-production, the fast flux<br />
    variability constrains the Doppler factor to values which are inconsistent with<br />
    a large viewing angle as observed in the radio band. We investigate different<br />
    scenarios for the explanation of fast gamma-ray variability, namely emission<br />
    from: magnetospheric gaps, relativistic blobs propagating in the jet<br />
    (mini-jets) or external cloud (or star) entering the jet. We find that the only<br />
    plausible model to account for the luminosities here observed would be the<br />
    production of gamma rays in a magnetospheric gap around the central black hole<br />
    only in the eventuality of an enhancement of the magnetic field threading the<br />
    hole from its equipartition value with the gas pressure in the accretion flow.

    DOI： 10.1051/0004-6361/201832895

    arXiv

  34. Indirect dark matter searches in the dwarf satellite galaxy Ursa Major II with the MAGIC telescopes 査読有り 国際共著 国際誌

    M. L. Ahnen, S. Ansoldi, L. A. Antonelli, C. Arcaro, D. Baack, A. Babić, B. Banerjee, P. Bangale, U. Barres De Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, E. Bernardini, R.Ch. Berse, A. Berti, W. Bhattacharyya, A. Biland, O. Blanch, G. Bonnoli, R. Carosi, A. Carosi, G. Ceribella, A. Chatterjee, S. M. Colak, P. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, P. Cumani, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, F. Di Pierro, A. Domínguez, D. Dominis Prester, D. Dorner, M. Doro, S. Einecke, D. Elsaesser, V. Fallah Ramazani, A. Fernández-Barral, D. Fidalgo, M. V. Fonseca, L. Font, C. Fruck, D. Galindo, R.J. García López, M. Garczarczyk, M. Gaug, P. Giammaria, N. Godinović, D. Gora, D. Guberman, D. Hadasch, A. Hahn, T. Hassan, M. Hayashida, J. Herrera, J. Hose, D. Hrupec, K. Ishio, Y. Konno, H. Kubo, J. Kushida, D. Kuveždić, D. Lelas, E. Lindfors, S. Lombardi, F. Longo, M. López, C. Maggio, P. Majumdar, M. Makariev, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, S. Masuda, D. Mazin, K. Mielke, M. Minev, J. M. Miranda, R. Mirzoyan, A. Moralejo, V. Moreno, E. Moretti, T. Nagayoshi, V. Neustroev, A. Niedzwiecki, M. Nievas Rosillo, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogués, S. Paiano, J. Palacio, D. Paneque, R. Paoletti, J. M. Paredes, G. Pedaletti, M. Peresano, M. Persic, P.G. Prada Moroni, E. Prandini, I. Puljak, J. R. Garcia, I. Reichardt, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, T. Saito, K. Satalecka, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Stamerra, M. Strzys, T. Surić, M. Takahashi, L. Takalo, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, A. Treves, S. Tsujimoto, G. Vanzo, M. Vazquez Acosta, I. Vovk, J. E. Ward, M. Will, D. Zarić

    Journal of Cosmology and Astroparticle Physics   2018 巻 ( 3 )   2018年3月

    　詳細を見る

    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Institute of Physics Publishing  

    The dwarf spheroidal galaxy Ursa Major II (UMaII) is believed to be one of the most dark-matter dominated systems among the Milky Way satellites and represents a suitable target for indirect dark matter (DM) searches. The MAGIC telescopes carried out a deep observation campaign on UMaII between 2014 and 2016, collecting almost one hundred hours of good-quality data. This campaign enlarges the pool of DM targets observed at very high energy (E ≳ 50 GeV) in search for signatures of DM annihilation in the wide mass range between ∼100 GeV and ∼100 TeV. To this end, the data are analyzed with the full likelihood analysis, a method based on the exploitation of the spectral information of the recorded events for an optimal sensitivity to the explored DM models. We obtain constraints on the annihilation cross-section for different channels that are among the most robust and stringent achieved so far at the TeV mass scale from observations of dwarf satellite galaxies.

    DOI： 10.1088/1475-7516/2018/03/009

    Web of Science

    Scopus

  35. Evaluation of novel PMTs of worldwide best parameters for the CTA project

    R. Mirzoyan, D. Müller, J. Hose, U. Menzel, D. Nakajima, M. Takahashi, M. Teshima, T. Toyama, T. Yamamoto

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   845 巻   頁： 603 - 606   2017年2月

    　詳細を見る

    掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier {BV}  

    DOI： 10.1016/j.nima.2016.06.080

  36. 光電子増倍管の1光電子信号強度分布の精密測定

    山本 常夏, 中森 健之, 永吉 勤, 西嶋 恭司, 野崎 誠也, Mazin D., 増田 周, Mirzoyan R., 大岡 秀行, 折戸 玲子, 斎藤 隆之, 猪目 祐介, 櫻井 駿介, 高橋 光成, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 吉田 龍生, 吉井 柊, 郡司 修一, Hadasch D., 林田 将明, 片桐 秀明, 今野 裕介, 窪 秀利, 櫛田 淳子

    日本物理学会講演概要集   72 巻 ( 0 ) 頁： 60 - 60   2017年

    　詳細を見る

    記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

    DOI： 10.11316/jpsgaiyo.72.2.0_60

  37. Application of the calorimeter-only photon classes of the Fermi-LAT to GRB studies

    高橋 光成, Caputo Regina, Longo Francesco, Paneque David, Sgrò Carmelo, Fermi LAT Collaboration

    日本物理学会講演概要集   72 巻 ( 0 ) 頁： 462 - 462   2017年

    　詳細を見る

    記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

    <p>The Fermi Large Area Telescope (LAT) has established the existence of emission above tens of GeV from GRBs but the sensitivity is limited by statistics. More data are needed to reveal the mechanism of the temporally extended high-energy emission. The LAT consists of a tracker, a calorimeter and an anti-coincidence detector. The standard event classes require that gamma rays convert in the tracker. To increase statistics above 20 GeV, we have developed the &quot;Calorimeter-only&quot; event classes which recover events without usable tracker information. Additionally, their field of view is broader than the regular one. In this talk, we report the performance of them for GRB photon search. I will present them in two cases, a GRB was being pointed by the telescope or was in the outer region of the field of view where the Calorimeter-only classes have larger effective area than the regular ones.</p>

    DOI： 10.11316/jpsgaiyo.72.1.0_462

  38. Evaluation of Photo Multiplier Tube candidates for the Cherenkov Telescope Array

    R. Mirzoyan, D. Müller, Y. Hanabata, J. Hose, U. Menzel, D. Nakajima, M. Takahashi, M. Teshima, T. Toyama, T. Yamamoto

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   824 巻   頁： 640 - 641   2016年7月

    　詳細を見る

    掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier {BV}  

    DOI： 10.1016/j.nima.2015.08.030

  39. CTA報告 111：CTA大口径望遠鏡の性能向上に向けた7段光電子増倍管の評価結果

    高橋 光成, 窪 秀利, 櫛田 淳子, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 武田 淳希, 田中 真伸, 谷川 俊介, 辻本 晋平, 永吉 勤, 手嶋 政廣, 寺田 幸功, 友野 弥生, 中嶋 大輔, 中森 健之, 西嶋 恭司, 野崎 誠也, 林田 将明, 馬場 彩, 増田 周, 石尾 一馬, 山本 常夏, 吉田 龍生, Tan Dang Viet, Hadasch Daniela, Mazin Daniel, 他CTA-Japan consortium, 猪目 祐介, 大岡 秀行, 奥村 曉, 折戸 玲子, 片桐 秀明, 岸田 柊

    日本物理学会講演概要集   71 巻 ( 0 ) 頁： 324 - 324   2016年

    　詳細を見る

    記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

    <p>CTA大口径望遠鏡はチェレンコフ光密度が低くなる数十GeVのガンマ線を観測するため、高感度かつ低バックグラウンドの光電子増倍管が求められる。2基目以降に向け浜松ホトニクス(株)と共同開発した R12992は、S/N比に影響するパルス幅がダイノードの段数を8段から7段とすることにより初号機用に比べ大きく改善された。また量子効率もピーク値で平均43%にまで上昇した。このR12992の諸特性を測定、評価した結果を報告する。</p>

    DOI： 10.11316/jpsgaiyo.71.2.0_324

  40. 22aAT-5 CTA報告106 : CTA大口径望遠鏡初号機用カメラ試験

    猪目 祐介, 石尾 一馬, 梅津 陽平, 大岡 秀行, 奥村 曉, 小野 祥弥, 折戸 玲子, 片桐 秀明, 掃部 寛隆, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 高橋 光成, 武田 淳希, 田中 真伸, 谷川 俊介, 辻本 晋平, 手嶋 政廣, 友野 弥生, 中嶋 大輔, 中森 健之, 永吉 勤, 西嶋 恭司, 畑中 謙一郎, 林田 将明, 増田 周, 松岡 俊介, 山本 常夏, 吉田 龍生, TAN DANG VIET, Hadasch Daniela, Mazin Daniel, CTA-Japan consortium

    日本物理学会講演概要集   71 巻 ( 0 ) 頁： 526 - 526   2016年

    　詳細を見る

    記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

    DOI： 10.11316/jpsgaiyo.71.1.0_526

    CiNii Books

  41. 22aAT-11 Fermi-LATカロリーメータ単独解析の開発、性能及びインパクト

    高橋 光成, LAT collaboration

    日本物理学会講演概要集   71 巻 ( 0 )   2016年

    　詳細を見る

    記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

    DOI： 10.11316/jpsgaiyo.71.1.0_531

  42. Evaluation of the basic propertied of the novel 1.5 in. size PMTs from Hamamatsu Photonics and Electron Tubes Enterprises

    T. Toyama, Y. Hanabata, J. Hose, U. Menzel, R. Mirzoyan, D. Nakajima, M. Takahashi, M. Teshima, T. Yamamoto

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   787 巻   頁： 280 - 283   2015年7月

    　詳細を見る

    掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier {BV}  

    DOI： 10.1016/j.nima.2014.12.070

  43. 21pDD-4 CTA報告89 : CTA大口径望遠鏡初号機用光電子増倍管の較正試験系と試験結果

    永吉 勤, 猪目 祐介, 梅津 陽平, 大岡 秀行, 荻野 桃子, 折戸 玲子, 片桐 秀明, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 澤田 真理, 高橋 光成, 辻本 晋平, 坪根 善雄, 手嶋 政廣, 寺田 幸功, 友野 弥生, 中嶋 大輔, 西嶋 恭司, 花畑 義隆, 林田 将明, 馬場 彩, 松岡 俊介, 山本 常夏, CTA-Japan Consortium

    日本物理学会講演概要集   70 巻 ( 0 ) 頁： 409 - 409   2015年

    　詳細を見る

    記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

    DOI： 10.11316/jpsgaiyo.70.1.0_409

    CiNii Books

  44. 27pSJ-3 CTA報告98 : CTA大口径望遠鏡用PMT性能評価結果

    高橋 光成, 猪目 祐介, 梅津 陽平, 大岡 秀行, 折戸 玲子, 片桐 秀明, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 澤田 真理, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 友野 弥生, 中嶋 大輔, 永吉 勤, 西嶋 恭司, 林田 将明, 馬場 彩, 松岡 俊介, 山本 常夏, CTA-Japan Consortium

    日本物理学会講演概要集   70 巻 ( 0 ) 頁： 392 - 392   2015年

    　詳細を見る

    記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

    DOI： 10.11316/jpsgaiyo.70.2.0_392

    CiNii Books

  45. 21pDD-5 CTA報告90 : CTA大口径望遠鏡初号機用PMT信号の高精度測定

    高橋 光成, 猪目 祐介, 梅津 陽平, 大岡 秀行, 荻野 桃子, 折戸 玲子, 片桐 秀明, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 澤田 真理, 辻本 晋平, 坪根 善雄, 手嶋 政廣, 寺田 幸功, 友野 弥生, 中嶋 大輔, 永吉 勤, 西嶋 恭司, 花畑 義隆, 林田 将明, 馬場 彩, 松岡 俊介, 山本 常夏, CTA-Japan Consortium

    日本物理学会講演概要集   70 巻 ( 0 ) 頁： 410 - 410   2015年

    　詳細を見る

    記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

    DOI： 10.11316/jpsgaiyo.70.1.0_410

    CiNii Books

  46. Novel 1.5′ Size exceptional PMTs for the CTA project

    Razmik Mirzoyan, Dominik Müller, Takeshi Toyama, Daisuke Nakajima, Uta Menzel, Jürgen Hose, Mitsunari Takahashi, Tokonatsu Yamamoto, Masahiro Teshima

    Proceedings of Science   6-9- 巻   2015年

    　詳細を見る

    記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：Proceedings of Science (PoS)  

    Photo Multiplier Tubes (PMT) are the most wide-spread detectors for measuring fast, faint light signals. About seven years ago we started an improvement program for the PMT candidates for the Cherenkov Telescope Array (CTA) project with the companies Hamamatsu Photonics K.K. (Japan) and Electron Tubes Enterprises Ltd. (England). CTA is the next major Imaging Atmospheric Cherenkov Telescopes array for high energy gamma-ray astrophysics
    about 100 telescopes of sizes of 23m, 12m and 4m in diameter will be built in the Northern and Southern hemispheres. For CTA we need PMTs with the highest possible quantum efficiency, maximized photo electron collection efficiency, short pulse width of a few ns, very low afterpulsing and transit time spread. After several iterations the manufacturers were able to produce 1.5′ PMTs of enhanced peak quantum efficiency of ∼ 40%. These can collect up to 95-98% of photo electrons onto the first dynode for the wavelengths ≥ 400nm. A pulse width of ≤ 3ns has been achieved at the selected operational gain of 40k. The after-pulsing for a threshold of ≥ 4 photo electrons is reduced to the level of 0.02%. We report on the measurements of PMT R12992-100 from Hamamatsu, which is already a commercial product and the PMT D573KFLSB from Electron Tubes Enterprises. The latter is not the final PMT but the latest iteration towards the candidate sensor for the CTA project.

    Scopus

  47. MULTIFREQUENCY STUDIES OF THE PECULIAR QUASAR 4C+21.35 DURING THE 2010 FLARING ACTIVITY 査読有り 国際共著 国際誌

    M. Ackermann, M. Ajello, A. Allafort, E. Antolini, G. Barbiellini, D. Bastieri, R. Bellazzini, E. Bissaldi, E. Bonamente, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, E. Cavazzuti, C. Cecchi, R. C. G. Chaves, A. Chekhtman, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, S. Cutini, F. D'Ammando, F. De Palma, C. D. Dermer, E. do Couto e Silva, D. Donato, P. S. Drell, C. Favuzzi, J. Finke, W. B. Focke, A. Franckowiak, Y. Fukazawa, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, N. Giglietto, F. Giordano, M. Giroletti, G. Godfrey, I. A. Grenier, S. Guiriec, M. Hayashida, J. W. Hewitt, D. Horan, R. E. Hughes, G. Iafrate, A. S. Johnson, J. Knoedlseder, M. Kuss, J. Lande, S. Larsson, L. Latronico, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, M. Mayer, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, T. Mizuno, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, R. Nemmen, E. Nuss, T. Ohsugi, M. Orienti, E. Orlando, J. S. Perkins, M. Pesce-Rollins, F. Piron, G. Pivato, T. A. Porter, S. Raino, M. Razzano, A. Reimer, O. Reimer, D. A. Sanchez, A. Schulz, C. Sgro, E. J. Siskind, G. Spandre, P. Spinelli, L. Stawarz, H. Takahashi, T. Takahashi, J. G. Thayer, J. B. Thayer, D. J. Thompson, M. Tinivella, D. F. Torres, G. Tosti, E. Troja, T. L. Usher, J. Vandenbroucke, V. Vasileiou, G. Vianello, V. Vitale, M. Werner, B. L. Winer, D. L. Wood, K. S. Wood, J. Aleksic, S. Ansoldi, L. A. Antonelli, P. Antoranz, A. Babic, P. Bangale, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, K. Berger, E. Bernardini, A. Biland, O. Blanch, R. K. Bock, S. Bonnefoy, G. Bonnoli, F. Borracci, T. Bretz, E. Carmona, A. Carosi, D. Carreto Fidalgo, P. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, P. Da Vela, F. Dazzi, A. De Angelis, G. De Caneva, B. De Lotto, C. Delgado Mendez, M. Doert, A. Dominguez, D. Dominis Prester, D. Dorner, M. Doro, S. Einecke, D. Eisenacher, D. Elsaesser, E. Farina, D. Ferenc, M. V. Fonseca, L. Font, K. Frantzen, C. Fruck, R. J. Garcia Lopez, M. Garczarczyk, D. Garrido Terrats, M. Gaug, G. Giavitto, N. Godinovic, A. Gonzalez Munoz, S. R. Gozzini, D. Hadasch, A. Herrero, D. Hildebrand, J. Hose, D. Hrupec, W. Idec, V. Kadenius, H. Kellermann, M. L. Knoetig, K. Kodani, Y. Konno, J. Krause, H. Kubo, J. Kushida, A. La Barbera, D. Lelas, N. Lewandowska, E. Lindfors, S. Lombardi, M. Lopez, R. Lopez-Coto, A. Lopez-Oramas, E. Lorenz, I. Lozano, M. Makariev, K. Mallot, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, B. Marcote, M. Mariotti, M. Martinez, D. Mazin, U. Menzel, M. Meucci, J. M. Miranda, R. Mirzoyan, A. Moralejo, P. Munar-Adrover, D. Nakajima, A. Niedzwiecki, K. Nishijima, K. Nilsson, N. Nowak, R. Orito, A. Overkemping, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, X. Paredes-Fortuny, S. Partini, M. Persic, F. Prada, P. G. Prada Moroni, E. Prandini, S. Preziuso, I. Puljak, R. Reinthal, W. Rhode, M. Ribo, J. Rico, J. Rodriguez Garcia, S. Ruegamer, A. Saggion, T. Saito, K. Saito, M. Salvati, K. Satalecka, V. Scalzotto, V. Scapin, C. Schultz, T. Schweizer, S. N. Shore, A. Sillanpaeae, J. Sitarek, I. Snidaric, D. Sobczynska, F. Spanier, V. Stamatescu, A. Stamerra, T. Steinbring, J. Storz, S. Sun, T. Suric, L. Takalo, H. Takami, F. Tavecchio, P. Temnikov, T. Terzic, D. Tescaro, M. Teshima, J. Thaele, O. Tibolla, T. Toyama, A. Treves, P. Vogler, R. M. Wagner, F. Zandanel, R. Zanin, M. F. Aller, E. Angelakis, D. A. Blinov, S. G. Djorgovski, A. J. Drake, N. V. Efimova, M. A. Gurwell, D. C. Homan, B. Jordan, E. N. Kopatskaya, Y. Y. Kovalev, O. M. Kurtanidze, A. Laehteenmaeki, V. M. Larionov, M. L. Lister, E. Nieppola, M. G. Nikolashvili, E. Ros, T. Savolainen, L. A. Sigua, M. Tornikoski

    ASTROPHYSICAL JOURNAL   786 巻 ( 2 )   2014年5月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IOP PUBLISHING LTD  

    The discovery of rapidly variable Very High Energy ( VHE; E &gt; 100 GeV). - ray emission from 4C + 21.35 ( PKS 1222+ 216) by MAGIC on 2010 June 17, triggered by the high activity detected by the Fermi Large Area Telescope ( LAT) in high energy ( HE; E &gt; 100 MeV). - rays, poses intriguing questions on the location of the. - ray emitting region in this flat spectrum radio quasar. We present multifrequency data of 4C + 21.35 collected from centimeter to VHE during 2010 to investigate the properties of this source and discuss a possible emission model. The first hint of detection at VHE was observed by MAGIC on 2010 May 3, soon after a gamma- ray flare detected by Fermi-LAT that peaked on April 29. The same emission mechanism may therefore be responsible for both the HE and VHE emission during the 2010 flaring episodes. Two optical peaks were detected on 2010 April 20 and June 30, close in time but not simultaneous with the two gamma- ray peaks, while no clear connection was observed between the X-ray and gamma- ray emission. An increasing flux density was observed in radio and mm bands from the beginning of 2009, in accordance with the increasing gamma- ray activity observed by Fermi-LAT, and peaking on 2011 January 27 in the mm regime ( 230 GHz). We model the spectral energy distributions ( SEDs) of 4C + 21.35 for the two periods of the VHE detection and a quiescent state, using a one-zone model with the emission coming from a very compact region outside the broad line region. The three SEDs can be fit with a combination of synchrotron self-Compton and external Compton emission of seed photons from a dust torus, changing only the electron distribution parameters between the epochs. The fit of the optical/UV part of the spectrum for 2010 April 29 seems to favor an inner disk radius of &lt; six gravitational radii, as one would expect from a prograde-rotating Kerr black hole.

    DOI： 10.1088/0004-637X/786/2/157

    Web of Science

  48. 18pSB-8 CTA報告80 : CTA大口径望遠鏡PMTキャリブレーション(18pSB 高エネルギーガンマ線(CTA,MAGIC),宇宙線・宇宙物理領域)

    高橋 光成, 郡司 修一, 小山 志勇, 澤田 真理, 辻本 晋平, 坪根 善雄, 手嶋 政廣, 寺田 幸功, 友野 弥生, 中嶋 大輔, 永吉 勤, 猪目 祐介, 西嶋 恭司, 花畑 義隆, 林田 将明, 馬場 彩, 松岡 俊介, 山本 常夏, CTA-Japan Consortium, 梅津 陽平, 大岡 秀行, 荻野 桃子, 折戸 玲子, 片桐 秀明, 櫛田 淳子, 窪 秀利

    日本物理学会講演概要集   69 巻 ( 0 )   2014年

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    記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

    DOI： 10.11316/jpsgaiyo.69.2.1.0_33_3

  49. 27pTS-3 CTA報告69 : CTA大口径望遠鏡の焦点面検出器の開発(27pTS 高エネルギーガンマ線(CTA,MAGIC),宇宙線・宇宙物理領域)

    高橋 光成, 郡司 修一, 小山 志勇, 佐々木 浩人, 澤田 真理, 田中 駿也, 手嶋 政廣, 辻本 晋平, 坪根 善雄, 寺田 幸功, 中嶋 大輔, 猪目 祐介, 永吉 勤, 西嶋 恭司, 花畑 義隆, 林田 将明, 馬場 彩, 山本 常夏, CTA-Japan Consortium, 上野 遥, 大岡 秀行, 荻野 桃子, 折戸 玲子, 片桐 秀明, 櫛田 淳子, 窪 秀利

    日本物理学会講演概要集   69 巻 ( 0 )   2014年

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    記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

    DOI： 10.11316/jpsgaiyo.69.1.1.0_116_4

▼全件表示

論文の先頭へ▲

MISC 4

  1. 宇宙素粒子若手の会

    三木信太郎, 細川佳志, 高橋光成, 中村輝石  

    高エネルギーニュース41 巻 ( 4 ) 頁： 195 - 197   2023年

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    担当区分：責任著者   記述言語：日本語   掲載種別：会議報告等  

  2. ついに捉えた宇宙ガンマ線バーストからのTeVガンマ線放射

    野田浩司, 高橋光成, 深見哲志  

    日本物理学会誌76 巻 ( 5 ) 頁： 278 - 283   2021年5月

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    担当区分：責任著者   記述言語：日本語   掲載種別：記事・総説・解説・論説等（その他）  

  3. ブレーザー1ES 1959+650の2016年TeVフレアの多波長観測

    高橋光成, 稲田知大, 岩村由樹, 齋藤隆之, 櫻井駿介, 野田浩司, HADASCH Daniela, 深見哲志, 手嶋政廣, 手嶋政廣, MAZIN Daniel, MAZIN Daniel, BHATTACHARYYA Wrijupan, 井上進, 櫛田淳子, 辻本晋平, 西嶋恭司, 窪秀利, 野崎誠也, 増田周, 林田将明  

    日本天文学会年会講演予稿集2020 巻   2020年

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  4. GRB 190114CからのTeVガンマ線放射の物理

    井上進, NAVA Lara, 野田浩司, 深見哲志, BERTI Alessio, MICELI Davide, COVINO Stefano, MORETTI Elena, 須田祐介, VOVK Ievgen, 稲田知大, 岩村由樹, 齋藤隆之, 櫻井駿介, 高橋光成, HADASCH Daniela, 手嶋政廣, MAZIN Daniel, 櫛田淳子, 辻本晋平, 西嶋恭司, 窪秀利, 野崎誠也, 増田周  

    日本天文学会年会講演予稿集2019 巻   2019年

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    記述言語：日本語  

    J-GLOBAL

MISCの先頭へ▲

講演・口頭発表等 34

  1. Very-high-energy GRB events in novel Fermi-LAT photon data and their emission mechanism

    Mitsunari Takahashi, Fermi-LAT collaboration

    36th International Cosmic Ray Conference  2019年7月25日 

    　詳細を見る

    開催年月日： 2019年7月 - 2019年8月

    記述言語：英語   会議種別：口頭発表（一般）  

  2. MAGIC observation and broadband characterization of the remarkably bright flares of 1ES 1959+650 in 2016

    W. Bhattacharyya, M. Takahashi, M. Hayashida, Fermi-LAT collaboration, MAGIC collaboration

    36th International Cosmic Ray Conference  2019年7月29日 

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    開催年月日： 2019年7月 - 2019年8月

    記述言語：英語   会議種別：口頭発表（一般）  

  3. Very-high-energy GRB events in novel Fermi-LAT photon data and their emission mechanism 招待有り

    M. Takahashi

    The extreme Universe viewed in very-high-energy gamma rays 2018  2018年10月12日 

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    開催年月日： 2018年10月

    記述言語：英語   会議種別：口頭発表（招待・特別）  

  4. Calorimeter-only analysis of the Fermi Large Area Telescope 国際共著 国際会議

    M. Takahashi, R. Capto, D. Paneque, C. Sgrò

    Fifth International Fermi Symposium  2014年10月 

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    開催年月日： 2014年10月

    記述言語：英語   会議種別：ポスター発表  

  5. TeV Telescopes: technology and science 招待有り 国際会議

    Mitsunari Takahashi

    The 5th KMI International Symposium  2023年2月 

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    記述言語：英語   会議種別：口頭発表（招待・特別）  

  6. Cherenkov Telescope Array: Toward Energetic Universe by Capturing Faint Light 招待有り 国際会議

    Mitsunari Takahashi

    ICHEPAP2023  2023年12月 

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    記述言語：英語   会議種別：口頭発表（招待・特別）  

  7. MAGIC報告70：ブレーザー1ES 1959+650の2016年TeVフレアの多波長観測 国際共著

    高橋 光成, 辻本 晋平, 手嶋 政廣, 西嶋 恭司, 野崎 誠也, 野田 浩司, Hadasch Daniela, 深見 哲志, 増田 周, Mazin Daniel, 他 MAGIC Collaboration, Bhattacharyya Wrijupan, 林田 将明, 他 Fermi-LAT Collaboration, 稲田 知大, 井上 進, 岩村 由樹, 櫛田 淳子, 窪 秀利, 齋藤 隆之, 櫻井 駿介

    日本物理学会講演概要集  2019年  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.74.2.0_363

    CiNii Research

  8. IceCube Search for Neutrinos from 1ES 1959+650: Completing the Picture

    Kintscher, T, Icecube Collaboration, Fact Collaboration, MAGIC Collaboration, Krings, K, Dorner, D, Bhattacharyya, W, Takahashi, M

    35th International Cosmic Ray Conference  2017年7月 

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    開催年月日： 2017年7月

    記述言語：英語   会議種別：口頭発表（一般）  

  9. Simulation and analysis of time-evolutional gamma-ray sources 国際会議

    Mitsunari Takahashi

    The extreme Universe viewed in very-high-energy gamma rays 2023  2024年2月 

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    記述言語：英語   会議種別：口頭発表（一般）  

  10. CTA 報告 223: CTA大口径望遠鏡搭載の焦点面検出器のアフターパルス発生確率の研究

    清本拓人, 高橋光成, 山本常夏, 小林志鳳, 武石隆治, 齊藤隆之, 立石大, 寺田幸功, 糸川拓海, 猪目祐介, 大岡秀行, 岡知彦, 奥村曉, 折戸玲子, 片桐秀明, 櫛田淳子, 窪秀利, 郡司修一, 櫻井駿介, 田島宏康, 田中真伸, 手嶋政廣, 寺内健太, 門叶冬樹, 中森健之, 西嶋恭司, 野崎誠也, 野田浩司, 橋山和明, Daniela Hadasch, Daniel Mazin, 溝手雅也, 他CTA-Japan Consortium

    日本物理学会 2024年春季大会  2024年3月 

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    記述言語：日本語   会議種別：口頭発表（一般）  

  11. CTA大口径望遠鏡搭載の焦点面検出器のアフターパルス発生確率の研究

    清本拓人, 高橋光成, 山本常夏, 小林志鳳, 武石隆治, 齋藤隆之, 立石大, 寺田幸功, 糸川拓海, 猪目祐介, 大岡秀行, 岡知彦, 奥村曉, 折戶玲子, 片桐秀明, 櫛田淳子, 窪秀利, 郡司修一, 櫻井駿介, 田島宏康, 田中真伸, 手嶋政廣, 寺内健太, 門叶冬樹, 中森健之, 嶋恭司, 野崎誠也, 野田浩司, 橋山和明, Daniela Hadasch, Daniel Mazin, 溝手雅也, 他 CTA-Japan Consortium

    第4回 ITDC プラットフォームA （光検出器、シンチレータ）研究会  2024年3月 

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    記述言語：日本語   会議種別：口頭発表（一般）  

  12. Primordial black hole evaporation searches with very-high-energy gamma-ray telescopes 国際会議

    Mitsunari Takahashi

    Focus Week on Primordial Black Holes  2024年1月 

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    記述言語：英語   会議種別：口頭発表（一般）  

  13. 光電子増倍管の1光電子信号強度分布の精密測定 招待有り 国際共著

    山本 常夏, 中森 健之, 永吉 勤, 西嶋 恭司, 野崎 誠也, Mazin D., 増田 周, Mirzoyan R., 大岡 秀行, 折戸 玲子, 斎藤 隆之, 猪目 祐介, 櫻井 駿介, 高橋 光成, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 吉田 龍生, 吉井 柊, 郡司 修一, Hadasch D., 林田 将明, 片桐 秀明, 今野 裕介, 窪 秀利, 櫛田 淳子

    日本物理学会講演概要集  2017年  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.72.2.0_60

    CiNii Research

  14. MAGIC報告71：GRB 190114CからのTeVガンマ線の発見 国際共著

    野田 浩司, Vovk Ievgen, 稲田 知大, 岩村 由樹, 櫛田 淳子, 窪秀 利, 齋藤 隆之, 櫻井 駿介, 高橋 光成, 辻本 晋平, 手嶋 政廣, 井上 進, 西嶋 恭司, 野崎 誠也, Hadasch Daniela, 増田 周, Mazin Daniel, 他MAGIC Collaboration, Berti Alessio, Covino Stefano, 深見 哲志, Miceli Davide, Moretti Elena, Nava Lara, 須田 祐介

    日本物理学会講演概要集  2019年  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.74.2.0_364

    CiNii Research

  15. MAGIC Report 60: Very high energy gamma-ray observations of binary systems with the MAGIC telescopes

    日本物理学会講演概要集  2017年  一般社団法人 日本物理学会

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    記述言語：英語   会議種別：口頭発表（一般）  

    <p>There are several types of Galactic sources that can potentially accelerate charged particles up to GeV and TeV energies.These accelerated particles can produce Very High Energy (VHE, E>100 GeV) gamma-ray emission through different processes like for example inverse Compton scattering of ambient photon fields by accelerated electrons.Here we present the results of observations with the MAGIC telescopes on gamma-ray binaries, microquasars and the subclass of binary systems known as novae. The focus lies on the following sources: LS I +61º303, V404 Cyg, SS433 and several novae.The binary system LS I +61º303 was observed in a long-term monitoring campaign for 8 years. We will show the newest results on our search for superorbital variability also in context with contemporaneous optical observations.Observations on the microquasar V404 Cyg on the other hand were triggered by a series of exceptional X-ray outbursts in June 2015. This strategy is similar to observations of several novae that are triggered through activity in the optical waveband. Results of these observations will be shown here.Furthermore, we will present the results of our studies of the only super-critical accretion system known in our galaxy: SS 433.</p>

    DOI： 10.11316/jpsgaiyo.72.1.0_459

    CiNii Research

  16. CTA報告157：CTA大口径望遠鏡に用いる光電子増倍管の時間応答性能の測定

    砂田 裕志, 猪目 祐介, 岩村 由樹, 大岡 秀行, 岡 知彦, 岡崎 奈緒, 奥村 曉, 折戸 玲子, 梶原 侑貴, 片桐 秀明, 櫛田 淳子, 窪 秀利, 郡司 修一, 小林 志鳳, 齋藤 隆之, 櫻井 駿介, 鈴木 萌, 高橋 光成, 田中 真伸, 田村 謙治, 町支 勇貴, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中森 健之, 永吉 勤, 西嶋 恭司, 野上 優人, 野崎 誠也, 野田 浩司, 林田 将明, 馬場 彩, 平子 丈, 古田 智也, 増田 周, 山本 常夏, 吉田 龍生, 池野 正弘, 内田 智久

    日本物理学会講演概要集  2019年  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.74.2.0_360

    CiNii Research

  17. CTA報告142:CTA大口径望遠鏡初号機の焦点面カメラ統合試験(II)

    砂田裕志, 稲田知大, 猪目祐介, 岩村由樹, 大岡秀行, 岡崎奈緒, 奥村曉, 折戸玲子, 片岡淳, 片桐秀明, 櫛田淳子, 木村颯一朗, 窪秀利, 郡司修一, 小山志勇, 齋藤隆之, 櫻井駿介, 澤田真理, 鈴木萌, 高橋光成, 高原大, 田中真伸, 辻本晋平, 手嶋政廣, 手嶋政廣, 寺田幸功, 門叶冬樹, 中嶋大輔, 中森健之, 永吉勤, 西嶋恭司, 西山楽, 野崎誠也, 林田将明, 馬場彩, 平子丈, 深見哲志, 増田周, 山本常夏, 吉田龍生, HADASCH Daniela, MAZIN Daniel

    日本物理学会講演概要集(CD-ROM)  2018年9月21日  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.73.2.0_191

    CiNii Research

  18. CTA報告134：CTA大口径望遠鏡搭載光電子増倍管の経年変化の研究

    櫻井 駿介, 片岡 淳, 片桐 秀明, 木村 颯一朗, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 澤田 真理, 永吉 勤, 砂田 裕志, 高橋 光成, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中嶋 大輔, 中森 健之, 西嶋 恭司, 西山 楽, 稲田 知大, 野崎 誠也, 林田 将明, 馬場 彩, 平子 丈, 深見 哲志, 増田 周, 山本 常夏, 吉田 龍生, Hadasch D., Mazin D., 猪目 祐介, 他 CTA-Japan consortium, 岩村 由樹, 大岡 秀行, 奥村 曉, 岡崎 奈緒, 折戸 玲子

    日本物理学会講演概要集  2018年  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.73.1.0_417

    CiNii Research

  19. CTA報告133：CTA大口径望遠鏡初号機の焦点面カメラ統合試験

    野崎 誠也, 片桐 秀明, 加藤 翔, 木村 颯一朗, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 櫻井 駿介, 稲田 知大, 澤田 真理, 砂田 裕志, 高橋 光成, 高原 大, 田中 真伸, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中嶋 大輔, 猪目 祐介, 中森 健之, 永吉 勤, 西嶋 恭司, 西山 楽, 林田 将明, 馬場 彩, 平子 丈, 深見 哲志, 増田 周, 山本 常夏, 岩村 由樹, 吉田 龍生, Hadasch D., Mazin D., 他CTA-Japan consortium, 池野 正弘, 内田 智久, 大岡 秀行, 奥村 曉, 岡崎 奈緒, 折戸 玲子, 片岡 淳

    日本物理学会講演概要集  2018年  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.73.1.0_416

    CiNii Research

  20. CTA報告125：CTA大口径望遠鏡初号機の焦点面検出器建設状況

    櫻井 駿介, 折戸 玲子, 片岡 淳, 片桐 秀明, 木村 颯一朗, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 池野 正弘, 澤田 真理, 砂田 裕志, 高橋 光成, 田中 真伸, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中嶋 大輔, 中森 健之, 稲田 知大, 永吉 勤, 西嶋 恭司, 西山 楽, 野崎 誠也, 林田 将明, 馬場 彩, 平子 丈, 深見 哲志, 増田 周, 山本 常夏, 猪目 祐介, 吉田 龍生, Hadasch D., Mazin D., 他CTA-Japan consortium, 岩村 由樹, 内田 智久, 大岡 秀行, 奥村 曉, 岡崎 奈緒

    日本物理学会講演概要集  2017年  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.72.2.0_360

    CiNii Research

  21. CTA報告119：CTA大口径望遠鏡初号機の焦点面カメラのシステム統合試験

    中嶋 大輔, 櫛田 淳子, 郡司 修一, 今野 裕介, 齋藤 隆之, 櫻井 駿介, 高橋 光成, 武田 淳希, 谷川 俊介, Tan D.V., 辻本 晋平, 猪目 祐介, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中森 健之, 永吉 勤, 西嶋 恭司, 西山 楽, 野崎 誠也, 林田 将明, 馬場 彩, 大岡 秀行, 増田 周, 山本 常夏, 吉田 龍生, 吉田 麻佑, Mazine D., Hadasch D., 他CTA-Japan consortium, 奥村 曉, 折戸 玲子, 片桐 秀明, 岸田 柊, 木村 颯一朗, 窪 秀利

    日本物理学会講演概要集  2017年  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    <p>現在スペイン領ラパルマ島においてCTA計画の大口径望遠鏡の建設が進められている。望遠鏡の焦点面検出器は265台のPMTモジュールで構成される。PMTモジュールは7本のPMTと付随するコントロール用回路基板、信号読み出し回路基板で構成される。PMTモジュールのこれらの構成要素は日本グループ中心に開発、量産を行った。本公演では、量産したPMTモジュールを複数台組み込んだ、カメラシステムとしての統合試験の結果を報告する。</p>

    DOI： 10.11316/jpsgaiyo.72.1.0_466

    CiNii Research

  22. CTA報告 111：CTA大口径望遠鏡の性能向上に向けた7段光電子増倍管の評価結果

    高橋 光成, 永吉 勤, 石尾 一馬, 猪目 祐介, 大岡 秀行, 奥村 曉, 折戸 玲子, 片桐 秀明, 岸田 柊, 窪 秀利, 櫛田 淳子, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 武田 淳希, 田中 真伸, 谷川 俊介, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 友野 弥生, 中嶋 大輔, 中森 健之, 西嶋 恭司, 野崎 誠也, 林田 将明, 馬場 彩, 増田 周, 山本 常夏, 吉田 龍生, Tan Dang Viet, Hadasch Daniela, Mazin Daniel, 他CTA-Japan consortium

    日本物理学会講演概要集  2016年  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    <p>CTA大口径望遠鏡はチェレンコフ光密度が低くなる数十GeVのガンマ線を観測するため、高感度かつ低バックグラウンドの光電子増倍管が求められる。2基目以降に向け浜松ホトニクス(株)と共同開発した R12992は、S/N比に影響するパルス幅がダイノードの段数を8段から7段とすることにより初号機用に比べ大きく改善された。また量子効率もピーク値で平均43%にまで上昇した。このR12992の諸特性を測定、評価した結果を報告する。</p>

    DOI： 10.11316/jpsgaiyo.71.2.0_324

    CiNii Research

  23. CTA 報告150：CTA大口径望遠鏡初号機の焦点面カメラ試運転試験

    野崎 誠也, 稲田 知大, 猪目 祐介, 岩村 由樹, 大岡 秀行, 岡崎 奈緒, 岡 知彦, 奥村 曉, 折戸 玲子, 梶原 侑貴, 片桐 秀明, 櫛田 淳子, 木村 颯一朗, 窪 秀利, 郡司 修一, 小山 志勇, 齋藤 隆之, 櫻井 駿介, 澤田 真理, 鈴木 萌, 砂田 裕志, 高橋 光成, 高原 大, 田中 真伸, 田村 謙治, 町支 勇貴, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中森 健之, 永吉 勤, 西嶋 恭司, 西山 楽, 野田 浩司, 林田 将明, 馬場 彩, 平子 丈, 深見 哲志, 古田 智也, 増田 周, 山本 常夏, 吉田 龍生, 他CTA-Japan consortium, 池野 正弘, 内田 智久

    日本物理学会講演概要集  2019年  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.74.1.0_559

    CiNii Research

  24. CTA 報告112：CTA大口径望遠鏡初号機用カメラ試験

    野崎 誠也, 石尾 一馬, 猪目 祐介, 大岡 秀行, 奥村 曉, 折戸 玲子, 片桐 秀明, 岸田 柊, 窪 秀利, 櫛田 淳子, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 高橋 光成, 武田 淳希, 田中 真伸, 谷川 俊介, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 友野 弥生, 中嶋 大輔, 中森 健之, 永吉 勤, 西嶋 恭司, 林田 将明, 馬場 彩, 増田 周, 山本 常夏, 吉田 龍生, Tan Dang Viet, Hadasch Daniela, Mazin Daniel, 他CTA-Japan Consortium, 池野 正弘, 内田 智久

    日本物理学会講演概要集  2016年  一般社団法人 日本物理学会

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    記述言語：日本語   会議種別：口頭発表（一般）  

    <p>Cherenkov Telescope Array(CTA)計画は、口径の異なる複数の望遠鏡を用いて 20GeVから100TeV 以上のガンマ線を従来よりも10倍高い感度で全天観測する望遠鏡 建設計画である。我々は大口径望遠鏡搭載用カメラの試験・ 開発を行っている。本講演では、初号機で用いるPMT、 波形読出し回路それぞれ133本、19個のモジュールから成る試 験用ミニカメラの構成、動作試験の結果、 及び次号機での搭載に向けた、 新版の波形読出し回路基板の設計の概要、 開発状況について報告する。</p>

    DOI： 10.11316/jpsgaiyo.71.2.0_325

    CiNii Research

  25. CTA 報告 126：CTA大口径望遠鏡焦点面検出器の改良と較正

    砂田 裕志, 折戸 玲子, 片岡 淳, 片桐 秀明, 木村 颯一朗, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 池野 正弘, 澤田 真理, 櫻井 駿介, 高橋 光成, 田中 真伸, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中嶋 大輔, 中森 健之, 稲田 知大, 永吉 勤, 西嶋 恭司, 西山 楽, 野崎 誠也, 林田 将明, 馬場 彩, 平子 丈, 深見 哲志, 増田 周, 山本 常夏, 猪目 祐介, 吉田 龍生, Hadasch D., Mazin D., 他CTA-Japan consortium, 岩村 由樹, 内田 智久, 大岡 秀行, 奥村 曉, 岡崎 奈緒

    日本物理学会講演概要集  2017年  一般社団法人 日本物理学会

    　詳細を見る

    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.72.2.0_361

    CiNii Research

  26. Application of the calorimeter-only photon classes of the Fermi-LAT to GRB studies 国際共著

    高橋 光成, Fermi LAT Collaboration

    日本物理学会講演概要集  2017年  一般社団法人 日本物理学会

    　詳細を見る

    記述言語：英語   会議種別：口頭発表（一般）  

    <p>The Fermi Large Area Telescope (LAT) has established the existence of emission above tens of GeV from GRBs but the sensitivity is limited by statistics. More data are needed to reveal the mechanism of the temporally extended high-energy emission. The LAT consists of a tracker, a calorimeter and an anti-coincidence detector. The standard event classes require that gamma rays convert in the tracker. To increase statistics above 20 GeV, we have developed the &quot;Calorimeter-only&quot; event classes which recover events without usable tracker information. Additionally, their field of view is broader than the regular one. In this talk, we report the performance of them for GRB photon search. I will present them in two cases, a GRB was being pointed by the telescope or was in the outer region of the field of view where the Calorimeter-only classes have larger effective area than the regular ones.</p>

    DOI： 10.11316/jpsgaiyo.72.1.0_462

    CiNii Research

  27. 27pTS-3 CTA報告69 : CTA大口径望遠鏡の焦点面検出器の開発(27pTS 高エネルギーガンマ線(CTA,MAGIC),宇宙線・宇宙物理領域)

    高橋 光成, 猪目 祐介, 上野 遥, 大岡 秀行, 荻野 桃子, 折戸 玲子, 片桐 秀明, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 佐々木 浩人, 澤田 真理, 田中 駿也, 手嶋 政廣, 辻本 晋平, 坪根 善雄, 寺田 幸功, 中嶋 大輔, 永吉 勤, 西嶋 恭司, 花畑 義隆, 林田 将明, 馬場 彩, 山本 常夏

    日本物理学会講演概要集  2014年  一般社団法人 日本物理学会

    　詳細を見る

    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.69.1.1.0_116_4

    CiNii Research

  28. 27pSJ-3 CTA報告98 : CTA大口径望遠鏡用PMT性能評価結果

    高橋 光成, 猪目 祐介, 梅津 陽平, 大岡 秀行, 折戸 玲子, 片桐 秀明, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 澤田 真理, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 友野 弥生, 中嶋 大輔, 永吉 勤, 西嶋 恭司, 林田 将明, 馬場 彩, 松岡 俊介, 山本 常夏

    日本物理学会講演概要集  2015年  一般社団法人 日本物理学会

    　詳細を見る

    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.70.2.0_392

    CiNii Research

  29. 27aSJ-10 MAGIC Report 53 : Observations of very distant blazars with MAGIC 国際共著

    日本物理学会講演概要集  2015年  一般社団法人 日本物理学会

    　詳細を見る

    記述言語：英語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.70.2.0_376

    CiNii Research

  30. 22aAT-5 CTA報告106 : CTA大口径望遠鏡初号機用カメラ試験

    猪目 祐介, 石尾 一馬, 梅津 陽平, 大岡 秀行, 奥村 曉, 小野 祥弥, 折戸 玲子, 片桐 秀明, 掃部 寛隆, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 高橋 光成, 武田 淳希, 田中 真伸, 谷川 俊介, 辻本 晋平, 手嶋 政廣, 友野 弥生, 中嶋 大輔, 中森 健之, 永吉 勤, 西嶋 恭司, 畑中 謙一郎, 林田 将明, 増田 周, 松岡 俊介, 山本 常夏, 吉田 龍生

    日本物理学会講演概要集  2016年  一般社団法人 日本物理学会

    　詳細を見る

    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.71.1.0_526

    CiNii Research

  31. 22aAT-11 Fermi-LATカロリーメータ単独解析の開発、性能及びインパクト

    高橋 光成, LAT collaboration

    日本物理学会講演概要集  2016年  一般社団法人 日本物理学会

    　詳細を見る

    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.71.1.0_531

    CiNii Research

  32. 21pDD-5 CTA報告90 : CTA大口径望遠鏡初号機用PMT信号の高精度測定

    高橋 光成, 猪目 祐介, 梅津 陽平, 大岡 秀行, 荻野 桃子, 折戸 玲子, 片桐 秀明, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 澤田 真理, 辻本 晋平, 坪根 善雄, 手嶋 政廣, 寺田 幸功, 友野 弥生, 中嶋 大輔, 永吉 勤, 西嶋 恭司, 花畑 義隆, 林田 将明, 馬場 彩, 松岡 俊介, 山本 常夏, CTA-Japan Consortium

    日本物理学会講演概要集  2015年  一般社団法人 日本物理学会

    　詳細を見る

    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.70.1.0_410

    CiNii Research

  33. 21pDD-4 CTA報告89 : CTA大口径望遠鏡初号機用光電子増倍管の較正試験系と試験結果

    永吉 勤, 猪目 祐介, 梅津 陽平, 大岡 秀行, 荻野 桃子, 折戸 玲子, 片桐 秀明, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 澤田 真理, 高橋 光成, 辻本 晋平, 坪根 善雄, 手嶋 政廣, 寺田 幸功, 友野 弥生, 中嶋 大輔, 西嶋 恭司, 花畑 義隆, 林田 将明, 馬場 彩, 松岡 俊介, 山本 常夏, CTA-Japan Consortium

    日本物理学会講演概要集  2015年  一般社団法人 日本物理学会

    　詳細を見る

    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.70.1.0_409

    CiNii Research

  34. 18pSB-8 CTA報告80 : CTA大口径望遠鏡PMTキャリブレーション(18pSB 高エネルギーガンマ線(CTA,MAGIC),宇宙線・宇宙物理領域)

    高橋 光成, 猪目 祐介, 梅津 陽平, 大岡 秀行, 荻野 桃子, 折戸 玲子, 片桐 秀明, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 澤田 真理, 辻本 晋平, 坪根 善雄, 手嶋 政廣, 寺田 幸功, 友野 弥生, 中嶋 大輔, 永吉 勤, 西嶋 恭司, 花畑 義隆, 林田 将明, 馬場 彩, 松岡 俊介, 山本 常夏

    日本物理学会講演概要集  2014年  一般社団法人 日本物理学会

    　詳細を見る

    記述言語：日本語   会議種別：口頭発表（一般）  

    DOI： 10.11316/jpsgaiyo.69.2.1.0_33_3

    CiNii Research

▼全件表示

講演・口頭発表等の先頭へ▲

科研費 4

  1. CTA-LSTとMAGICのガンマ線ステレオ観測によるハッブル定数の間接測定

    研究課題/研究課題番号：23K22497  2022年4月 - 2025年3月

    科学研究費助成事業  基盤研究(B)

    Mazin Daniel, Vovk Ievgen, 手嶋 政廣, 齋藤 隆之, 高橋 光成

    　 詳細を見る

    担当区分：研究分担者 

    We will take data on flaring AGNs and GRBs with the new trigger system. We will analyse joint CTA-LST and MAGIC data and derive constraints on the extragalactic background light as well as the Hubble Constant H0. We also look into a new technology of Hollow Core Fibers to improve the trigger system.
    The stereo hardware trigger has been installed and validated.
    In particular, we purchased and deployed a new trigger cable between the LST camera and MAGIC counting house shortening the trigger travel time by about 500ns compared to the previous installation. This is important to deliver the LST trigger in time to build a coincidence trigger with the MAGIC telescopes because MAGIC telescopes have a relatively short analog buffer length. We also installed a new firmware in MAGIC trigger system and developed the software code to control and monitor zenith and azimuth dependent trigger delays between LST and MAGIC telescopes. The trigger timing has been adjusted and several test data sets has been taken in hardware stereo mode.
    In the same time work on methodology to derive constraints on the density of the Extragalactic Background Light has been done, which can be directly used to constrain the Hubble constant H0.
    The progress of the project is within the schedule. The hardware part of the project has been designed, deployed and commissioned. The evaluation of the performance is ongoing.
    In FY2023 we will study the actual performance and take data
    on various gamma-ray sources. We expect several trips to La Palma to polish the performance of the trigger and make it to a standard trigger system between LST1 and MAGIC telescopes. We also expect to take first data with hardware stereo trigger on extragalactic sources to derive preliminary limits on the H0 constant.

  2. CTA-LSTとMAGICのガンマ線ステレオ観測によるハッブル定数の間接測定

    研究課題/研究課題番号：22H01226  2022年4月 - 2025年3月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    Mazin Daniel, Vovk Ievgen, 手嶋 政廣, 齋藤 隆之, 高橋 光成

    　 詳細を見る

    担当区分：研究分担者  資金種別：競争的資金

  3. 大口径チェレンコフ望遠鏡による突発天体と暗黒物質の研究

    研究課題/研究課題番号：20KK0067  2020年10月 - 2025年3月

    日本学術振興会  科学研究費助成事業 国際共同研究加速基金(国際共同研究強化(B))  国際共同研究加速基金(国際共同研究強化(B))

    野田 浩司, 齋藤 隆之, 高橋 光成, 中森 健之, 稲田 知大, 齋藤 隆之, 高橋 光成, 中森 健之, 稲田 知大

    　 詳細を見る

    担当区分：研究代表者  資金種別：競争的資金

    配分額：18720000円 （ 直接経費：14400000円 、 間接経費：4320000円 ）

    2021年度もまた、新型コロナウイルス流行の影響により欧州への海外出張に強い制限があり、計画されていた中期出張をキャンセルあるいは短縮せざるをえなかった。CTAの大口径望遠鏡の2-4号基に搭載されるPMTカメラの焦点面モジュールの品質管理測定については、本研究分担者らによってスペインにて2021年度中に行われたが、結果的に短期出張となったこともあり別財源で賄われた。一方、大口径望遠鏡光学系の性能評価（Point Spread Function測定）のためのカメラのレンズとハウジングを購入し、2台目以降の大口径望遠鏡の準備を進めた。ラパルマでは火山の噴火があり、現地渡航が必要なハードウェア作業がスムーズに進まなかった。
    一方で、MAGIC望遠鏡を用いたガンマ線バースト天体の物理を進めた。MAGICではGRB 160821BというShort GRBからの高エネルギーガンマ線放射の兆候を検出し、これを標準的な放射モデルで解釈し難いことを示した。この内容は、研究代表者野田を主著者として2021年2月に出版された。2021年度には同内容を宇宙線国際会議で発表した。さらに野田は、GRB190114CからのVHEガンマ線の発見及びこのGRB160821Bの内容で、2021年12月発表の日本学術振興会賞を受賞した。
    CTA大口径望遠鏡のデータ解析については、GRBグループを宇宙線研究所に立ち上げ、ICRRに滞在しているLAPP研究所のFiasson准教授と学生のDeBony、国内の研究者との共同研究を始めた。暗黒物質については、分担者稲田が日本を離れたため分担から外れ、また分担者高橋も東京大学宇宙線研究所から名古屋大学に移籍した。さらに担当の宇宙線研究所の大学院生も修士学位論文で忙しく、安定した研究活動にならなかった。今後2022年度の様子を見て、研究が滞りなく進むように調整予定である。

  4. 暗黒物質検出に向けたガンマ線望遠鏡の気球による絶対的エネルギー較正

    研究課題/研究課題番号：20K14484  2020年4月 - 2024年3月

    日本学術振興会  科学研究費助成事業 若手研究  若手研究

    高橋 光成

    　 詳細を見る

    担当区分：研究代表者 

    配分額：3120000円 （ 直接経費：2400000円 、 間接経費：720000円 ）

    気球に搭載する光源の設計と地上との通信方法の検討を行った。光源については、計測器開発を行う企業と設計を議論し、ＬＥＤ1個を光らせるドライブ回路を試作してもらった。これを実験室において試験し、パルス発光がチェレンコフ望遠鏡の光検出器である光電子増倍管により検出できていること、ＬＥＤ10個以上を同期させれば高度１０ｋｍに浮かべた場合でも望遠鏡により観測可能な光量があることを確認した。また、光源を一様に光らせるためＬＥＤをディフューザーで覆う。これは紫外線透過アクリルを正二十面体の形に組み合わせ、表面は紫外線を乱反射するようマット加工を施す。このディフューザーについて、企業に製造方法の検討と見積もりを依頼し、不定性があるものの本研究の予算で可能な回答を得られた。地上との通信方法については、高価な地上受信設備を要しないイリジウムショートバースト通信が利用できないか調査検討した。これは気球から位置・気象情報をイリジウム衛星に送信し、インターネットを通じて受け取る案であった。しかし、市販の気象観測ゾンデからイリジウム端末に情報を出力できるようにするには多くの改造コストがかかることが分かり、当初の計画通り市販のゾンデの通信機能を利用することにした。地上受信設備をはじめとしたゾンデ観測システムが高価な事が問題であったが、名古屋大学宇宙地球環境研究所の共同利用機器を借用できる目処がたった。以上の調査研究により問題点の解消が進み具体的な設計を進められる状況になった。

科研費の先頭へ▲