2017 Fiscal Year Final Research Report
Study of cosmic-ray acceleration and propagation processes in star-forming regions using high energy X rays and soft gamma rays
| Project/Area Number |
26800160
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Nagoya University (2016-2017)
Japan Aerospace EXploration Agency (2014-2015) |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Keywords | 水素原子ガス / 光学的厚さ / 宇宙線スペクトル / 軟ガンマ線検出器 |
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| Outline of Final Research Achievements |
This study aimed to reveal cosmic-ray acceleration and propagation processes in the local interstellar medium using X-ray and gamma-ray data. Due to an incident of the Hitomi satellite, we could not perform analyses using X-ray and soft gamma-ray data, but we succeeded to accurately measure the mass of the atomic hydrogen for a local molecular cloud complex, Chamaeleon region, through comparing GeV gamma rays obtained by Fermi with a gas column density model based on dust optical depth estimated from the Planck dust emission model. The obtained hydrogen column density is 1.3-1.5 times larger than that measured by previous estimates. Based on this column density model, we derived a cosmic-ray spectrum in the Chamaeleon region, which suggests a uniform cosmic-ray density in the vicinity of the solar system.
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| Free Research Field |
ガンマ線天文学
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