| Project/Area Number |
16K17685
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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 | The University of Tokyo |
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Principal Investigator |
Kido Eiji 東京大学, 宇宙線研究所, 特任助教 (00633778)
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| Research Collaborator |
Kalashev O.
Thomson G.
Tinyakov P.
NAGATAKI Shigehiro
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | UHECR / 超高エネルギー宇宙線 / 大規模構造 / 宇宙線 / 宇宙物理 |
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| Outline of Final Research Achievements |
We fit the energy spectra observed by the Telescope Array (TA) and Telescope Array Low Energy extension (TALE) experiment using phenomenological extragalactic cosmic ray proton source model assuming some models of galactic cosmic rays. The fit range is from about 30 PeV to 10 EeV including the energy region known as “second knee” and “ankle”. We assume the following conditions of the sources. The energy spectrum of cosmic ray protons is power law and the power index is -α at the source. The cosmic ray source density per comoving unit volume is the power law of (1 + z) and the power index is m until z = Zc and constant for the sources at z > Zc. α=2.38+0.04-0.04，m=3.6+0.2-0.3 is obtained by the fitting. The constraint of Zc is obtained assuming some models of cosmological magnetic fields.
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