The opening of gamma ray astronomy above 100 TeV energy region

• Project/Area Number: 15H03655
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: Ohnishi Munehiro 東京大学, 宇宙線研究所, 助教 (10260514)
• Research Collaborator: Takita Masato ; Sako Takashi K. ; Kawata Kazumasa
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000); Fiscal Year 2017: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2016: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000); Fiscal Year 2015: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
• Keywords: 宇宙線 / ガンマ線天文学

Outline of Final Research Achievements

This study is to observe cosmic gamma rays above 100 TeV energy region with very high signal-to-noise ratio and wide field of view using the Tibet air shower array with the underground water-Cherenkov-type muon detector array.
We observed highest energy gamma rays above 100 TeV from the Crab Nebula by these arrays. We also detected above 100 TeV gamma rays from MGRO J1908+06. These results give the new important knowledge to the cosmic ray physics, and we succeeded to open the gamma ray astronomy above 100 TeV energy region.

Academic Significance and Societal Importance of the Research Achievements

本研究では、今まで誰も検出することができなかった100 TeV (10の14乗 電子ボルト) を超える最高エネルギーの宇宙ガンマ線を観測することに成功した。100 TeVを超える高いエネルギーのガンマ線を観測した本研究は、物理学的には未だ解明されていない宇宙線の起源と加速に重要な知見を与えるとともに、天文学的には新しいエネルギー領域のガンマ線天文学を切り開くものである。

Research Products

• [Int'l Joint Research] 中国科学院高脳物理研究所/中国科学院国家天文台/西藏大学(中国)
• [Int'l Joint Research] 中国科学院高能物理研究所/中国科学院国家天文台/西藏大学(中国)
• [Int'l Joint Research] 中国科学院高能物理研究所/中国科学院国家天文台/西藏大学(中国)
• [Journal Article] Evaluation of the Interplanetary Magnetic Field Strength Using the Cosmic-Ray Shadow of the Sun (2018)
  • Author(s): M. Amenomori et al.
  • Journal Title: Physical Review Letters Volume: 120 Issue: 3
  • DOI: 10.1103/physrevlett.120.031101
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Influence of Earth-directed Coronal Mass Ejections on the Sun’s Shadow Observed by the Tibet-III Air Shower Array (2018)
  • Author(s): M. Amenomori et al.
  • Journal Title: The Astrophysical Journal Volume: 860 Issue: 1 Pages: 13-13
  • DOI: 10.3847/1538-4357/aac2e6
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Northern sky Galactic Cosmic Ray anisotropy between 10 and 1000 TeV with the Tibet Air Shower Array (2017)
  • Author(s): M. Amenomori, D. Chen, S. W. Cui, Danzengluobu, J. Huang, H. Y. Jia, K. Kawata, M. Ohnishi, T. K. Sako, M. Takita, X. Y. Zhang et al.
  • Journal Title: The Astrophysical Journal Volume: 836 Issue: 2 Pages: 153-153
  • DOI: 10.3847/1538-4357/836/2/153
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Search for Gamma Rays above 100 TeV from the Crab Nebula with the Tibet Air Shower Array and 100 m2 Muon Detector (2015)
  • Author(s): M. Amenomori, K. Kawata, et al.
  • Journal Title: The Astrophysical Journal Volume: 813 Issue: 2 Pages: 98-102
  • DOI: 10.1088/0004-637x/813/2/98
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 100 TeV Gamma-Ray Observation of the Crab Nebula with the Tibet Air Shower Array (2019)
  • Author(s): K. Kawata
  • Organizer: 36th International Cosmic Ray Conference
  • Int'l Joint Research
• [Presentation] Observation of gamma-ray emission above 10 TeV from the super nova remnant G106.3+2.7 (2019)
  • Author(s): T. K. Sako
  • Organizer: 36th International Cosmic Ray Conference
  • Int'l Joint Research
• [Presentation] Extended Gamma-Ray Emission beyond 10 TeV from Geminga with the Tibet AS+MD array (2019)
  • Author(s): Y. Katayose
  • Organizer: 36th International Cosmic Ray Conference
  • Int'l Joint Research
• [Presentation] Search for pulsed gamma-ray emission in the 100 TeV region from several pulsars with the Tibet AS+ MD array (2019)
  • Author(s): K. Hibino
  • Organizer: 36th International Cosmic Ray Conference
  • Int'l Joint Research
• [Presentation] A northern sky survey for 100TeV gamma-ray sources using the Tibet air shower array and muon detector array (2019)
  • Author(s): Xu Chen
  • Organizer: 36th International Cosmic Ray Conference
  • Int'l Joint Research
• [Presentation] On the spectrum of gamma-rays ranging from 1 TeV to 200 TeV, emitted from the MGRO J1908+06 and observed by the Tibet air shower array and muon detector array (2019)
  • Author(s): Ding Chen
  • Organizer: 36th International Cosmic Ray Conference
  • Int'l Joint Research
• [Presentation] Cosmic-ray Anisotropy Observed with the Tibet AS+MD Array (2019)
  • Author(s): M. Ohnishi
  • Organizer: Asia Oceania Geosciences Society (AOGS) 16th Annual Meeting
  • Int'l Joint Research
• [Presentation] チベット空気シャワー観測装置による超高エネルギーガンマ線源の観測 (1) (2019)
  • Author(s): 佐古崇志
  • Organizer: 日本物理学会 第74回年次大会
• [Presentation] チベット空気シャワー観測装置による超高エネルギーガンマ線源の観測 (2) (2019)
  • Author(s): 川田和正
  • Organizer: 日本物理学会 第74回年次大会
• [Presentation] チベット空気シャワー観測装置におけるガンマ線起源空気シャワーの再構成 (2018)
  • Author(s): 川田和正
  • Organizer: 日本物理学会 2018年秋季大会
• [Presentation] Observation of high-energy cosmic rays with the Tibet air shower array (2018)
  • Author(s): 瀧田正人
  • Organizer: 日本物理学会 2018年秋季大会
  • Invited
• [Presentation] チベット空気シャワーアレイにおける100TeV領域ガンマ線のエネルギー決定方法 (2017)
  • Author(s): 川田和正
  • Organizer: 日本物理学会 第72回年次大会 (2017年)
  • Place of Presentation: 大阪大学
  • Year and Date: 2017-03-17
• [Presentation] The Tibet AS+MD Project; status report 2017 (2017)
  • Author(s): M. Takita
  • Organizer: 35th International Cosmic Ray Conference
  • Int'l Joint Research
• [Presentation] The ALPACA experiment (2016)
  • Author(s): Takashi K. Sako
  • Organizer: 7th Workshop on Air Shower Detection at High Altitude
  • Place of Presentation: Trino, Italy
  • Year and Date: 2016-11-30
  • Int'l Joint Research / Invited
• [Presentation] ALPACA実験1: ALPACA実験計画概要 (2016)
  • Author(s): 大西宗博
  • Organizer: 日本天文学会 2016年秋季年会
  • Place of Presentation: 愛媛大学
  • Year and Date: 2016-09-14
• [Presentation] The ALPACA Project (2016)
  • Author(s): Masato Takita
  • Organizer: 19th International Symposium on Very High Energy Cosmic Ray Interactions
  • Place of Presentation: Moscow, Russia
  • Year and Date: 2016-08-22
  • Int'l Joint Research / Invited
• [Presentation] The TIBET AS+MD Project; progress report 2015 (2015)
  • Author(s): Masato Takita
  • Organizer: 34th International Cosmic Ray Conference
  • Place of Presentation: The Hague, The Netherlands
  • Year and Date: 2015-07-30
  • Int'l Joint Research
• [Presentation] Search for gamma rays above 100 TeV from the Crab Nebula using the Tibet air shower array and the 100 m2 muon detector (2015)
  • Author(s): Takashi K. Sako
  • Organizer: 34th International Cosmic Ray Conference
  • Place of Presentation: The Hague, The Netherlands
  • Year and Date: 2015-07-30
  • Int'l Joint Research