Updated on 2021/12/03

写真a

 
TAKAHASHI Mitsunari
 
Organization
Institute for Space-Earth Environmental Research Division for Cosmic Ray Research Designated assistant professor
Title
Designated assistant professor

Degree 1

  1. Doctor of Philosophy ( 2018.9 ) 

 

Papers 16

  1. Broadband characterisation of the very intense TeV flares of the blazar 1ES 1959+650 in 2016 Reviewed International coauthorship

    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   Vol. 638   2020.6

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:{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 Reviewed

    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   Vol. 894   page: 1 - 7   2018.6

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.nima.2018.03.034

  3. 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   Vol. 575 ( 7783 ) page: 459 - 463   2019.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    DOI: 10.1038/s41586-019-1754-6

  4. 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   Vol. 845   page: 603 - 606   2017.2

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.nima.2016.06.080

  5. A Technique for Estimating the Absolute Gain of a Photomultiplier Tube

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

    Meeting Abstracts of the Physical Society of Japan   Vol. 72 ( 0 ) page: 60 - 60   2017

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.72.2.0_60

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

    Takahashi Mitsunari, Caputo Regina, Longo Francesco, Paneque David, Sgrò Carmelo, Fermi LAT Collaboration Collaboration

    Meeting Abstracts of the Physical Society of Japan   Vol. 72 ( 0 ) page: 462 - 462   2017

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    Language:Japanese   Publisher:The Physical Society of Japan  

    <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

  7. 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   Vol. 824   page: 640 - 641   2016.7

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.nima.2015.08.030

  8. CTA Report 111: Evaluation results of 7-dynode PMTs for improvement of CTA Large-Sized Telescope

    Takahashi M., Kubo H., Kushida J., Gunji S., Koyama S., Konno Y., Saito T., Takeda J., Tanaka M., Tanigawa S., Tsujimoto S., Nagayoshi T., Teshima M., Terada Y., Tomono Y., Nakajima D., Nakamori T., Nishijima K., Nozaki S., Hayashida M., Bamba A., Masuda S., Ishio K., Yamamoto T., Yoshida T., Tan Dang Viet, Hadasch Daniela, Mazin Daniel, CTA-Japan consortium, Inome Y., Ohoka H., Okumura A., Orito R., Katagiri H., Kishida S.

    Meeting Abstracts of the Physical Society of Japan   Vol. 71 ( 0 ) page: 324 - 324   2016

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.71.2.0_324

  9. 22aAT-5 CTA Report 106 : Camera test for the first unit of the CTA Large-Sized Telescope

    Inome Y., Kushida J., Kubo H., Gunji S., Koyama S., Konno Y., Saito T., Takahashi M., Takeda J., Tanaka M., Tanigawa S., Ishio K., Tsujimoto S., Teshima M., Tomono Y., Nakajima D., Nakamori T., Nagayoshi T., Nishijima K., Hatanaka K., Hayashida M., Masuda S., Umetsu Y., Matsuoka S., Yamamoto T., Yoshida T., TAN DANG VIET, Hadasch Daniela, Mazin Daniel, CTA-Japan consortium, Ohoka H., Okumura A., Ono S., Orito R., Katagiri H., Kamon H.

    Meeting Abstracts of the Physical Society of Japan   Vol. 71 ( 0 )   2016

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.71.1.0_526

  10. 22aAT-11 The development, performance and impact of the Calorimeter-onlyanalysis of the Fermi-LAT

    Takahashi Mitsunari

    Meeting Abstracts of the Physical Society of Japan   Vol. 71 ( 0 )   2016

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.71.1.0_531

  11. 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   Vol. 787   page: 280 - 283   2015.7

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.nima.2014.12.070

  12. 21pDD-4 CTA Report 89 : Calibration system and results of Photomultiplier Tubes for CTA first Large-Sized Telescope

    Nagayoshi Tsutomu, Gunji Shuichi, Koyama Shu, Sawada Makoto, Takahashi Mitsunari, Tsujimoto Shimpei, Tsubone Yoshio, Teshima Masahiro, Terada Yukikatsu, Tomono Yayoi, Nakajima Daisuke, Inome Yusuke, Nishijima Kyoshi, Hanabata Yoshitaka, Hayashida Masaaki, Bamba Aya, Matsuoka Shunsuke, Yamamoto Tokonatsu, CTA consortium, Umetsu Yohei, Ohoka Hideyuki, Orito Reiko, Katagiri Hideaki, Kushida Junko, Kubo Hidetoshi

    Meeting Abstracts of the Physical Society of Japan   Vol. 70 ( 0 )   2015

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.70.1.0_409

  13. 27pSJ-3 CTA Report 98 : Result of characterization of PMTs for the first Large-Sized Telescope of CTA

    Takahashi Mitsunari, Koyama Shu, Sawada Makoto, Tsujimoto Shimpei, Teshima Masahiro, Terada Yukikatsu, Tomono Yayoi, Nakajima Daisuke, Nagayoshi Tsutomu, Nishijima Kyoshi, Hayashida Masaaki, Inome Yusuke, Bamba Aya, Matsuoka Shunsuke, Yamamoto Tokonatsu, CTA-Japan Consortium, Umetsu Yohei, Ohoka Hideyuki, Orito Reiko, Katagiri Hideaki, Kushida Junko, Kubo Hidetoshi, Gunji Shuichi

    Meeting Abstracts of the Physical Society of Japan   Vol. 70 ( 0 )   2015

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.70.2.0_392

  14. 21pDD-5 CTA Report 90 : High precision measurement of PMTs for the first Large-Sized Telescope of CTA

    Takahashi Mitsunari, Gunji Shuichi, Koyama Shu, Sawada Makoto, Tsujimoto Shimpei, Tsubone Yoshio, Teshima Masahiro, Terada Yukikatsu, Tomono Yayoi, Nakajima Daisuke, Nagayoshi Tsutomu, Inome Yusuke, Nishijima Kyoshi, Hanabata Yoshitaka, Hayashida Masaaki, Bamba Aya, Matsuoka Shunsuke, Yamamoto Tokonatsu, CTA-Japan consortium, Umetsu Yohei, Ohoka Hideyuki, Ogino Momoko, Orito Reiko, Katagiri Hideaki, Kushida Junko, Kubo Hidetoshi

    Meeting Abstracts of the Physical Society of Japan   Vol. 70 ( 0 )   2015

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.70.1.0_410

  15. 18pSB-8 CTA Report 80 : Calibration of PMTs for the CTA Large-Sized Telescopes

    Takahashi Mitsunari, Gunji Shuichi, Koyama Shu, Sawada Makoto, Tsujimoto Shimpei, Tsubone Yoshio, Teshima Masahiro, Terada Yukikatsu, Tomono Yayoi, Nakajima Daisuke, Nagayoshi Tsutomu, Inome Yusuke, Nishijima Kyoshi, Hanabata Yoshitaka, Hayashida Masaaki, Bamba Aya, Matsuoka Shunsuke, Yamamoto Tokonatsu, CTA-Japan Consortium, Umetsu Yohei, Ohoka Hideyuki, Ogino Momoko, Orito Reiko, Katagiri Hideaki, Kushida Junko, Kubo Hidetoshi

    Meeting Abstracts of the Physical Society of Japan   Vol. 69 ( 0 )   2014

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.69.2.1.0_33_3

  16. 27pTS-3 The optimisation and estimation of the photomultiplier

    Takahashi M., Gunji S., Koyama S., Sasaki H., Sawada M., Tanaka S., Teshima M., Tsujimoto S., Tsubone Y., Terada Y., Nakajima D., Inome Y., Nagayoshi T., Nishijima K., Hanabata Y., Hayashida M., Bamba A., Yamamoto T., CTA-Japan Consortium, Ueno H., Ohoka H., Ogino M., Orito R., Katagiri H., Kusida J., Kubo H.

    Meeting Abstracts of the Physical Society of Japan   Vol. 69 ( 0 )   2014

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.69.1.1.0_116_4

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Presentations 5

  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  2019.7.25 

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    Event date: 2019.7 - 2019.8

    Language:English   Presentation type:Oral presentation (general)  

  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  2019.7.29 

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    Event date: 2019.7 - 2019.8

    Language:English   Presentation type:Oral presentation (general)  

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

    M. Takahashi

    The extreme Universe viewed in very-high-energy gamma rays 2018  2018.10.12 

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    Event date: 2018.10

    Language:English   Presentation type:Oral presentation (invited, special)  

  4. 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  2017.7 

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    Event date: 2017.7

    Language:English   Presentation type:Oral presentation (general)  

  5. Calorimeter-only analysis of the Fermi Large Area Telescope

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

    Fifth International Fermi Symposium  2014.10 

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    Event date: 2014.10

    Language:English   Presentation type:Poster presentation  

KAKENHI (Grants-in-Aid for Scientific Research) 2

  1. Research of transient objects and dark matter with large-sized Cherenkov telescopes

    Grant number:20KK0067  2020.10 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

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    Authorship:Coinvestigator(s) 

  2. Calibration of the absolute energy scale of gamma-ray telescopes with balloon toward dark matter detection

    Grant number:20K14484  2020.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists  Grant-in-Aid for Early-Career Scientists

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    Authorship:Principal investigator 

    Grant amount:\3120000 ( Direct Cost: \2400000 、 Indirect Cost:\720000 )