New picture of high-energy astronomical phenomena with turbulence acceleration of particles
| Project/Area Number |
16K05291
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Asano Katsuaki 東京大学, 宇宙線研究所, 准教授 (80399279)
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| Co-Investigator(Kenkyū-buntansha) |
寺木 悠人 旭川工業高等専門学校, 一般理数科, 講師 (40733093)
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| Research Collaborator |
Hayashida Masaaki
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 粒子加速 / 乱流 / ガンマ線バースト / 活動銀河核ジェット / ブレーザー / パルサー星雲 / 非熱的放射 / プラズマ乱流 / 理論天文学 |
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| Outline of Final Research Achievements |
The standard model of the particle acceleration in high-energy objects is the shock acceleration process. However, we propose a new model, the turbulence acceleration model, which agrees with the observed photon spectra of blazars and so on. We find that the most preferable model is the hard-sphere acceleration, in which the acceleration timescale is independent of particle energy. We also show that the hard-sphere acceleration is realized by large-scale turbulence via tes particle simulations in MHD waves.
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| Academic Significance and Societal Importance of the Research Achievements |
従来の衝撃波加速モデルでは、粒子のエネルギー分布をうまく説明できなかった。これに代わって近年活発に議論されている磁気再結合モデルは、強い磁場が要求される。しかし、観測は弱い磁場を示唆していた。我々の乱流モデルは、弱い磁場と高エネルギー粒子の分布を自然に両立させることに成功した。宇宙での粒子加速の描像を大きく変更するものである。このモデルを第一原理的なシミュレーションで実証したことも意義深い。
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Report
(4 results)
Research Products
(54 results)
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[Journal Article] Late engine activity of GRB161017A revealed by early optical observations2018
Author(s)
Tachibana Yutaro , Arimoto Makoto , Asano Katsuaki , Harita Shohei , Fujiwara Taichi , Yoshii Taketoshi , Itoh Ryosuke , Murata Katsuhiro L , Yatsu Yoichi , Morita Kotaro , et al.
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 70
Issue: 5
Pages: 92-92
DOI
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Peer Reviewed / Int'l Joint Research
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[Journal Article] Minute-timescale >100 MeV γ-Ray Variability during the Giant Outburst of Quasar 3C 279 Observed by Fermi-LAT in 2015 June2016
Author(s)
Ackermann, M.,Anantua, R.,,,Hayashida,M.,,,et al (Fermi-LAT Collaboration, alphabetical order)
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Journal Title
The Astrophysical Journal Letters
Volume: 824
Issue: 2
Pages: L20-L20
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] CALET Upper Limits on X-Ray and Gamma-Ray Counterparts of GW1512262016
Author(s)
O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, T. Sakamoto, H. Tomida, et al.
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Journal Title
The Astrophysical Journal
Volume: 829
Issue: 1
Pages: 20-24
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Wide-Band Spectra of Giant Radio Pulses from the Crab Pulsar2016
Author(s)
Ryo Mikami, Katsuaki Asano, Shuta J. Tanaka, Shota Kisaka, Mamoru Sekido, Kazuhiro Takefuji, Hiroshi Takeuchi, Hiroaki Misawa, Fuminori Tsuchiya, Hajime Kita, Yoshinori Yonekura, Toshio Terasawa
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Journal Title
The Astrophysical Journal
Volume: 832
Issue: 2
Pages: 212-212
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Book] ガンマ線バースト2019
Author(s)
河合誠之、浅野勝晃
Total Pages
304
Publisher
日本評論社
ISBN
9784535607446
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