Faculty Profiles - TAJIMA, Hiroyasu

Papers - TAJIMA, Hiroyasu

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Prospects for Cherenkov Telescope Array Observations of the Young Supernova Remnant RX J1713.7-3946 Reviewed International coauthorship

Acero F., Aloisio R., Amans J., Amato E., Antonelli L. A., Aramo C., Armstrong T., Arqueros F., Asano K., Ashley M., Backes M., Balazs C., Balzer A., Bamba A., Barkov M., Barrio J. A., Benbow W., Bernloehr K., Beshley V., Bigongiari C., Biland A., Bilinsky A., Bissaldi E., Biteau J., Blanch O., Blasi P., Blazek J., Boisson C., Bonanno G., Bonardi A., Bonavolonta C., Bonnoli G., Braiding C., Brau-Nogue S., Bregeon J., Brown A. M., Bugaev V., Bulgarelli A., Bulik T., Burton M., Burtovoi A., Busetto G., Bottcher M., Cameron R., Capalbi M., Caproni A., Caraveo P., Carosi R., Cascone E., Cerruti M., Chaty S., Chen A., Chen X., Chernyakova M., Chikawa M., Chudoba J., Cohen-Tanugi J., Colafrancesco S., Conforti V., Contreras J. L., Costa A., Cotter G., Covino S., Covone G., Cumani P., Cusumano G., D'Ammando F., D'Urso D., Daniel M., Dazzi F., De Angelis A., De Cesare G., De Franco A., De Frondat F., Dal Pino E. M. de Gouveia, De Lisio C., Lopez R. de los Reyes, De Lotto B., de Naurois M., De Palma F., Del Santo M., Delgado C., della Volpe D., Di Girolamo T., Di Giulio C., Di Pierro F., Di Venere L., Doro M., Dournaux J., Dumas D., Dwarkadas V., Diaz C., Ebr J., Egberts K., Einecke S., Elsaesser D., Eschbach S., Falceta-Goncalves D., Fasola G., Fedorova E., Fernandez-Barral A., Ferrand G., Fesquet M., Fiandrini E., Fiasson A., Filipovic M. D., Fioretti V., Font L., Fontaine G., Franco F. J., Freixas Coromina L., Fujita Y., Fukui Y., Funk S., Forster A., Gadola A., Lopez R. Garcia, Garczarczyk M., Giglietto N., Giordano F., Giuliani A., Glicenstein J., Gnatyk R., Goldoni P., Grabarczyk T., Graciani R., Graham J., Grandi P., Granot J., Green A. J., Griffiths S., Gunji S., Hakobyan H., Hara S., Hassan T., Hayashida M., Heller M., Helo J. C., Hinton J., Hnatyk B., Huet J., Huetten M., Humensky T. B., Hussein M., Horandel J., Ikeno Y., Inada T., Inome Y., Inoue S., Inoue T., Inoue Y., Ioka K., Iori M., Jacquemier J., Janecek P., Jankowsky D., Jung I., Kaaret P., Katagiri H., Kimeswenger S., Kimura S., Knodlseder J., Koch B., Kocot J., Kohri K., Komin N., Konno Y., Kosack K., Koyama S., Kraus M., Kubo H., Mezek G. Kukec, Kushida J., La Palombara N., Lalik K., Lamanna G., Landt H., Lapington J., Laporte P., Lee S., Lees J., Lefaucheur J., Lenain J. -P., Leto G., Lindfors E., Lohse T., Lombardi S., Longo F., Lopez M., Lucarelli F., Luque-Escamilla P. L., Lopez-Coto R., Maccarone M. C., Maier G., Malaguti G., Mandat D., Maneva G., Mangano S., Marcowith A., Marti J., Martinez M., Martinez G., Masuda S., Maurin G., Maxted N., Melioli C., Mineo T., Mirabal N., Mizuno T., Moderski R., Mohammed M., Montaruli T., Moralejo A., Mori K., Morlino G., Morselli A., Moulin E., Mukherjee R., Mundell C., Muraishi H., Murase K., Nagataki S., Nagayoshi T., Naito T., Nakajima D., Nakamori T., Nemmen R., Niemiec J., Nieto D., Nievas-Rosillo M., Nikolajuk M., Nishijima K., Noda K., Nogues L., Nosek D., Novosyadlyj B., Nozaki S., Ohira Y., Ohishi M., Ohm S., Okumura A., Ong R. A., Orito R., Orlati A., Ostrowski M., Oya I., Padovani M., Palacio J., Palatka M., Paredes J. M., Pavy S., Pe'er A., Persic M., Petrucci P., Petruk O., Pisarski A., Pohl M., Porcelli A., Prandini E., Prast J., Principe G., Prouza M., Pueschel E., Puelhofer G., Quirrenbach A., Rameez M., Reimer O., Renaud M., Ribo M., Rico J., Rizi V., Rodriguez J., Fernandez G. Rodriguez, Rodriguez Vazquez J. J., Romano P., Romeo G., Rosado J., Rousselle J., Rowell G., Rudak B., Sadeh I., Safi-Harb S., Saito T., Sakaki N., Sanchez D., Sangiorgi P., Sano H., Santander M., Sarkar S., Sawada M., Schioppa E. J., Schoorlemmer H., Schovanek P., Schussler F., Sergijenko O., Servillat M., Shalchi A., Shellard R. C., Siejkowski H., Sillanpaa A., Simone D., Sliusar V., Sol H., Stanic S., Starling R., Stawarz L., Stefanik S., Stephan M., Stolarczyk T., Szanecki M., Szepieniec T., Tagliaferri G., Tajima H., Takahashi M., Takeda J., Tanaka M., Tanaka S., Tejedor L. A., Telezhinsky I., Temnikov P., Terada Y., Tescaro D., Teshima M., Testa V., Thoudam S., Tokanai F., Torres D. F., Torresi E., Tosti G., Townsley C., Travnicek P., Trichard C., Trifoglio M., Tsujimoto S., Vagelli V., Vallania P., Valore L., van Driel W., van Eldik C., Vandenbroucke J., Vassiliev V., Vecchi M., Vercellone S., Vergani S., Vigorito C., Vorobiov S., Vrastil M., Vazquez Acosta M. L., Wagner S. J., Wagner R., Wakely S. P., Walter R., Ward J. E., Watson J. J., Weinstein A., White M., White R., Wierzcholska A., Wilcox P., Williams D. A., Wischnewski R., Wojcik P., Yamamoto T., Yamamoto H., Yamazaki R., Yanagita S., Yang L., Yoshida T., Yoshida M., Yoshiike S., Yoshikoshi T., Zacharias M., Zampieri L., Zanin R., Zavrtanik M., Zavrtanik D., Zdziarski A., Zech A., Zechlin H., Zhdanov V., Ziegler A., Zorn J.

ASTROPHYSICAL JOURNAL Vol. 840 ( 2 ) 2017.5

The Fermi Galactic Center GeV Excess and Implications for Dark Matter Reviewed International coauthorship

Fermi LAT collaboration

ASTROPHYSICAL JOURNAL Vol. 840 ( 1 ) 2017.5

Cosmic-ray electron-positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope Reviewed International coauthorship

Abdollahi S., Ackermann M., Ajello M., Atwood W. B., Baldini L., Barbiellini G., Bastieri D., Bellazzini R., Bloom E. D., Bonino R., Brandt T. J., Bregeon J., Bruel P., Buehler R., Cameron R. A., Caputo R., Caragiulo M., Castro D., Cavazzuti E., Cecchi C., Chekhtman A., Ciprini S., Cohen-Tanugi J., Costanza F., Cuoco A., Cutini S., D'Ammando F., de Palma F., Desiante R., Digel S. W., Di Lalla N., Di Mauro M., Di Venere L., Drell P. S., Drlica-Wagner A., Favuzzi C., Focke W. B., Funk S., Fusco P., Gargano F., Gasparrini D., Giglietto N., Giordano F., Giroletti M., Green D., Guillemot L., Guiriec S., Harding A. K., Jogler T., Johannesson G., Kamae T., Kuss M., La Mura G., Latronico L., Longo F., Loparco F., Lubrano P., Maldera S., Malyshev D., Manfreda A., Mazziotta M. N., Michelson P. F., Mirabal N., Mitthumsiri W., Mizuno T., Moiseev A. A., Monzani M. E., Morselli A., Moskalenko I. V., Negro M., Nuss E., Orlando E., Paneque D., Perkins J. S., Pesce-Rollins M., Piron F., Pivato G., Porter T. A., Principe G., Raino S., Rando R., Razzano M., Reimer A., Reimer O., Sgro C., Simone D., Siskind E. J., Spada F., Spandre G., Spinelli P., Tajima H., Thayer J. B., Tibaldo L., Torres D. F., Troja E., Wood M., Worley A., Zaharijas G., Zimmer S.

PHYSICAL REVIEW D Vol. 95 ( 8 ) 2017.4

Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data Reviewed International coauthorship

Abdollahi S., Ackermann M., Ajello M., Albert A., Atwood W. B., Baldini L., Barbiellini G., Bellazzini R., Bissaldi E., Bloom E. D., Bonino R., Bottacini E., Brandt T. J., Bruel P., Buson S., Caragiulo M., Cavazzuti E., Chekhtman A., Ciprini S., Costanza F., Cuoco A., Cutini S., D'Ammando F., de Palma F., Desiante R., Digel S. W., Di Lalla N., Di Mauro M., Di Venere L., Donaggio B., Drell P. S., Favuzzi C., Focke W. B., Fukazawa Y., Funk S., Fusco P., Gargano F., Gasparrini D., Giglietto N., Giordano F., Giroletti M., Green D., Guiriec S., Harding A. K., Jogler T., Johannesson G., Kamae T., Kuss M., Larsson S., Latronico L., Li J., Longo F., Loparco F., Lubrano P., Magill J. D., Malyshev D., Manfreda A., Mazziotta M. N., Meehan M., Michelson P. F., Mitthumsiri W., Mizuno T., Moiseev A. A., Monzani M. E., Morselli A., Negro M., Nuss E., Ohsugi T., Omodei N., Paneque D., Perkins J. S., Pesce-Rollins M., Piron F., Pivato G., Principe G., Raino S., Rando R., Razzano M., Reimer A., Reimer O., Sgro C., Simone D., Siskind E. J., Spada F., Spandre G., Spinelli P., Strong A. W., Tajima H., Thayer J. B., Torres D. F., Troja E., Vandenbroucke J., Zaharijas G., Zimmer S.

PHYSICAL REVIEW LETTERS Vol. 118 ( 9 ) 2017.3

Hitomi Constraints on the 3.5 keV Line in the Perseus Galaxy Cluster Reviewed International coauthorship

Aharonian F. A., Akamatsu H., Akimoto F., Allen S. W., Angelini L., Arnaud K. A., Audard M., Awaki H., Axelsson M., Bamba A., Bautz M. W., Blandford R. D., Bulbul E., Brenneman L. W., Brown G. V., Cackett E. M., Chernyakova M., Chiao M. P., Coppi P., Costantini E., de Plaa J., den Herder J. -W., Done C., Dotani T., Ebisawa K., Eckart M. E., Enoto T., Ezoe Y., Fabian A. C., Ferrigno C., Foster A. R., Fujimoto R., Fukazawa Y., Furuzawa A., Galeazzi M., Gallo L. C., Gandhi P., Giustini M., Goldwurm A., Gu L., Guainazzi M., Haba Y., Hagino K., Hamaguchi K., Harrus I., Hatsukade I., Hayashi K., Hayashi T., Hayashida K., Hiraga J., Hornschemeier A. E., Hoshino A., Hughes J. P., Ichinohe Y., Iizuka R., Inoue H., Inoue S., Inoue Y., Ishibashi K., Ishida M., Ishikawa K., Ishisaki Y., Itoh M., Iwai M., Iyomoto N., Kaastra J. S., Kallman T., Kamae T., Kara E., Kataoka J., Katsuda S., Katsuta J., Kawaharada M., Kawai N., Kelley R. L., Khangulyan D., Kilbourne C. A., King A. L., Kitaguchi T., Kitamoto S., Kitayama T., Kohmura T., Kokubun M., Koyama S., Koyama K., Kretschmar P., Krimm H. A., Kubota A., Kunieda H., Laurent P., Lebrun F., Lee S. -H., Leutenegger M. A., Limousin O., Loewenstein M., Long K. S., Lumb D. H., Madejski G. M., Maeda Y., Maier D., Makishima K., Markevitch M., Matsumoto H., Matsushita K., McCammon D., McNamara B. R., Mehdipour M., Miller E. D., Miller J. M., Mineshige S., Mitsuda K., Mitsuishi I., Miyazawa T., Mizuno T., Mori H., Mori K., Moseley H., Mukai K., Murakami H., Murakami T., Mushotzky R. F., Nakagawa T., Nakajima H., Nakamori T., Nakano T., Nakashima S., Nakazawa K., Nobukawa K., Nobukawa M., Noda H., Nomachi M., O'Dell S. L., Odaka H., Ohashi T., Ohno M., Okajima T., Ota N., Ozaki M., Paerels F., Paltani S., Parmar A., Petre R., Pinto C., Pohl M., Porter F. S., Pottschmidt K., Ramsey B. D., Reynolds C. S., Russell H. R., Safi-Harb S., Saito S., Sakai K., Sameshima H., Sasaki T., Sato G., Sato K., Sato R., Sawada M., Schartel N., Serlemitsos P. J., Seta H., Shidatsu M., Simionescu A., Smith R. K., Soong Y., Stawarz L., Sugawara Y., Sugita S., Szymkowiak A. E., Tajima H., Takahashi H., Takahashi T., Takeda S., Takei Y., Tamagawa T., Tamura K., Tamura T., Tanaka T., Tanaka Yasuo, Tanaka Yasuyuki, Tashiro M., Tawara Y., Terada Y., Terashima Y., Tombesi F., Tomida H., Tsuboi Y., Tsujimoto M., Tsunemi H., Tsuru T., Uchida H., Uchiyama H., Uchiyama Y., Ueda S., Ueda Y., Ueno S., Uno S., Urry C. M., Ursino E., de Vries C. P., Watanabe S., Werner N., Wik D. R., Wilkins D. R., Williams B. J., Yamada S., Yamaguchi H., Yamaoka K., Yamasaki N. Y., Yamauchi M., Yamauchi S., Yaqoob T., Yatsu Y., Yonetoku D., Yoshida A., Zhuravleva I., Zoghbi A.

ASTROPHYSICAL JOURNAL LETTERS Vol. 837 ( 1 ) 2017.3

Operating performance of the gamma-ray Cherenkov telescope: An end-to-end Schwarzschild-Couder telescope prototype for the Cherenkov Telescope Array Reviewed International coauthorship

Dournaux J. L., De Franco A., Laporte P., White R., Greenshaw T., Sol H., Abchiche A., Allan D., Amans J. P., Armstrong T. P., Balzer A., Berge D., Boisson C., Bousquet J. J., Brown A. M., Bryan M., Buchholtz G., Chadwick P. M., Costantini H., Cotter G., Daniel M., De Frondat F., Dumas D., Ernenwein J. P., Fasola G., Funk S., Gaudemard J., Graham J. A., Gironnet J., Hervet O., Hidaka N., Hinton J. A., Huet J. M., Jegouzo I., Jogler T., Kawashima T., Kraus M., Lapington J. S., Lefaucheur J., Markoff S., Melse T., Morhrmann L., Molnyeux P., Nolan S. J., Okumura A., Parsons R. D., Ross D., Rowell G., Sato Y., Sayede F., Schmoll J., Schoorlemmer H., Servillat M., Stamatescu V., Stephan M., Stuik R., Sykes J., Tajima H., Thornhill J., Tibaldo L., Trichard C., Vinkh J., Watson J., Yamane N., Zech A., Zink A.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 845 page： 355 - 358 2017.2

Fermi-LAT Observations of High-energy Behind-the-limb Solar Flares Reviewed International coauthorship

Ackermann M., Allafort A., Baldini L., Barbiellini G., Bastieri D., Bellazzini R., Bissaldi E., Bonino R., Bottacini E., Bregeon J., Bruel P., Buehler R., Cameron R. A., Caragiulo M., Caraveo P. A., Cavazzuti E., Cecchi C., Charles E., Ciprini S., Costanza F., Cutini S., D'Ammando F., de Palma F., Desiante R., Digel S. W., Di Lalla N., Di Mauro M., Di Venere L., Drell P. S., Favuzzi C., Fukazawa Y., Fusco P., Gargano F., Giglietto N., Giordano F., Giroletti M., Grenier I. A., Guillemot L., Guiriec S., Jogler T., Johannesson G., Kashapova L., Krucker S., Kuss M., La Mura G., Larsson S., Latronico L., Li J., Liu W., Longo F., Loparco F., Lubrano P., Magill J. D., Maldera S., Manfreda A., Mazziotta M. N., Mitthumsiri W., Mizuno T., Monzani M. E., Morselli A., Moskalenko I. V., Negro M., Nuss E., Ohsugi T., Omodei N., Orlando E., Pal'shin V., Paneque D., Perkins J. S., Pesce-Rollins M., Petrosian V., piron F., Principe G., Raino S., Rando R., Razzano M., Reimer O., da Costa F. Rubio, Sgro C., Simone D., Sisikind E. J., Sapada F., Spandre G., Spinelli P., Tajima H., Thayer J. B., Torres D. F., Troja E., Vianello G.

ASTROPHYSICAL JOURNAL Vol. 835 ( 2 ) 2017.2

SEARCHING THE GAMMA-RAY SKY FOR COUNTERPARTS TO GRAVITATIONAL WAVE SOURCES: FERMI GAMMA-RAY BURST MONITOR. AND LARGE AREA TELESCOPE OBSERVATIONS OF LVT151012 AND GW151226 Reviewed International coauthorship

Fermi GBM and LAT collaborations

ASTROPHYSICAL JOURNAL Vol. 835 ( 1 ) 2017.1

Inauguration and First Light of the GCT-M Prototype for the Cherenkov Telescope Array Reviewed International coauthorship

Watson J. J., De Franco A., Abchiche A., Allan D., Amans J. -P., Armstrong T. P., Balzer A., Berge D., Boisson C., Bousquet J. -J., Brown A. M., Bryan M., Buchholtz G., Chadwick P. M., Costantini H., Cotter G., Daniel M. K., De Frondat F., Dournaux J. -L., Dumas D., Ernenwein J. -P., Fasola G., Funk S., Gironnet J., Graham J. A., Greenshaw T., Hervet O., Hidaka N., Hinton J. A., Huet J. -M., Jegouzo I., Jogler T., Kraus M., Lapington J. S., Laporte P., Lefaucheur J., Markoff S., Melse T., Mohrmann L., Molyneux P., Nolan S. J., Okumura A., Osborne J. P., Parsons R. D., Rosen S., Ross D., Rowell G., Rulten C. B., Sato Y., Sayede F., Schmoll J., Schoorlemmer H., Servillat M., Sol H., Stamatescu V., Stephan M., Stuik R., Sykes J., Tajima H., Thornhill J., Tibaldo L., Trichard C., Vink J., White R., Yamane N., Zech A., Zink A., Zorn J.

HIGH ENERGY GAMMA-RAY ASTRONOMY Vol. 1792 2017

TARGET: A Digitizing And Trigger ASIC For The Cherenkov Telescope Array Reviewed International coauthorship

Funk S., Jankowsky D., Katagiri H., Kraus M., Okumura A., Schoorlemmer H., Shigenaka A., Tajima H., Tibaldo L., Varner G., Zink A., Zorn J.

HIGH ENERGY GAMMA-RAY ASTRONOMY Vol. 1792 2017

The Gamma-ray Cherenkov Telescope for the Cherenkov Telescope Array Reviewed International coauthorship

Tibaldo L., Abchiche A., Allan D., Amans J. -P., Armstrong T. P., Balzer A., Bergey D., Boisson C., Bousquet J. -J., Brown A. M., Bryan M., Buchholtz G., Chadwick P. M., Costantini H., Cotter G., Daniels M. K., De Franco A., De Frondat F., Dournaux J. -L., Dumas D., Ernenwein J. -P., Fasola G., Funk S., Gironnet J., Graham J. A., Greenshaws T., Hervet O., Hidaka N., Hintoni J. A., Huet J. -M., Jankowsky D., Jegouzo I., Jogler T., Kraus M., Lapington J. S., Laporte P., Lefaucheur J., Markoff S., Melse T., Mohrmann L., Molyneux P., Nolan S. J., Okumura A., Osborne J. P., Parsons R. D., Rosen S., Ross D., Rowell G., Rulten C. B., Sato Y., Sayede F., Schmoll J., Schoorlemmer H., Servillat M., Sol H., Stamatescu V., Stephan M., Stuik R., Sykes J., Tajima H., Thornhill J., Trichard C., Vink J., Watson J. J., White R., Yamane N., Zech A., Zink A., Zorn J.

HIGH ENERGY GAMMA-RAY ASTRONOMY Vol. 1792 2017

Study of the polarimetric performance of a Si/CdTe semiconductor Compton camera for the Hitomi satellite Reviewed International coauthorship

J. Katsuta et al.

Nuclear Inst. and Methods in Physics Research, A Vol. 840 page： 51-58 2016.12

The quiescent intracluster medium in the core of the Perseus cluster Reviewed International coauthorship

Hitomi collaboration

Nature Vol. 535 ( 7610 ) page： 117-121 2016.7

The First Fermi LAT Supernova Remnant Catalog Reviewed International coauthorship

Fermi LAT collaboration

The Astrophysical Journal Supplement Series Vol. 224 ( 1 ) page： article id. 8 2016.5

Fermi-LAT Observations of High-Energy Gamma-Ray Emission toward the Galactic Center Reviewed International coauthorship

Fermi LAT collaboration

The Astrophysical Journal Vol. 819 ( 1 ) page： article id. 44 2016.3

The first demonstration of the concept of "narrow-FOV Si/CdTe semiconductor Compton camera" Reviewed International coauthorship

Y. Ichinohe, et al.

Nuclear Inst. and Methods in Physics Research, A Vol. 806 page： 5-13 2016.1

Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data Reviewed International coauthorship

Fermi LAT collaboration

Physical Review Letters Vol. 115 page： 231301 2015.11

Language：English Publishing type：Research paper (scientific journal)

The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some of the most dark matter (DM) dominated objects known. We report on gamma-ray observations of Milky Way dSphs based on six years of Fermi Large Area Telescope data processed with the new Pass8 event-level analysis. None of the dSphs are significantly detected in gamma rays, and we present upper limits on the DM annihilation cross section from a combined analysis of 15 dSphs. These constraints are among the strongest and most robust to date and lie below the canonical thermal relic cross section for DM of mass <100 GeV annihilating via quark and tau-lepton channels.

DOI： 10.1103/PhysRevLett.115.231301

First Images from the Focusing Optics X-Ray Solar Imager Reviewed International coauthorship

FOXSI collaboration

The Astrophysical Journal Letters Vol. 793 page： L32 2014.9

Language：English Publishing type：Research paper (scientific journal)

The Focusing Optics X-ray Solar Imager (FOXSI) sounding rocket payload flew for the first time on 2012 November 2, producing the first focused images of the Sun above 5 keV. To enable hard X-ray (HXR) imaging spectroscopy via direct focusing, FOXSI makes use of grazing-incidence replicated optics combined with fine-pitch solid-state detectors. On its first flight, FOXSI observed several targets that included active regions, the quiet Sun, and a GOES-class B2.7 microflare. This Letter provides an introduction to the FOXSI instrument and presents its first solar image. These data demonstrate the superiority in sensitivity and dynamic range that is achievable with a direct HXR imager with respect to previous, indirect imaging methods, and illustrate the technological readiness for a spaceborne mission to observe HXRs from solar flares via direct focusing optics.

DOI： 10.1088/2041-8205/793/2/L32

Introducing the CTA concept Reviewed International coauthorship

CTA consortium

Astroparticle Physics Vol. 43 page： 3-18 2013.3

Language：English Publishing type：Research paper (scientific journal)

The Cherenkov Telescope Array (CTA) is a new observatory for very high-energy (VHE) gamma rays. CTA has ambitions science goals, for which it is necessary to achieve full-sky coverage, to improve the sensitivity by about an order of magnitude, to span about four decades of energy, from a few tens of GeV to above 100 TeV with enhanced angular and energy resolutions over existing VHE gamma-ray observatories. An international collaboration has formed with more than 1000 members from 27 countries in Europe, Asia, Africa and North and South America. In 2010 the CTA Consortium completed a Design Study and started a three-year Preparatory Phase which leads to production readiness of CTA in 2014. In this paper we introduce the science goals and the concept of CTA, and provide an overview of the project.

DOI： 10.1016/j.astropartphys.2013.01.007

Detection of the Characteristic Pion-Decay Signature in Supernova Remnants Reviewed International coauthorship

Fermi LAT collaboration

Science Vol. 339 page： 807-811 2013.2

Language：English Publishing type：Research paper (scientific journal)

Cosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.

DOI： 10.1126/science.1231160

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Papers - TAJIMA, Hiroyasu