JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
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titleCosmic-Ray Positrons from Astrophysical Sources: GRBs, Pulsars and SNRs
Author(jpn)井岡, 邦仁; 川中, 宣太; 野尻, 美保子; 藤田, 裕; 郡, 和範; 山崎, 了
Author(eng)Ioka, Kunihito; Kawanaka, Norita; Nojiri, Mihoko M.; Fujita, Yutaka; Kohri, Kazunori; Yamazaki, Ryo; Meszaros, Peter
Author Affiliation(jpn)高エネルギー加速器研究機構(KEK)素粒子原子核研究所理論部門 : 総合研究大学院大学; 高エネルギー加速器研究機構(KEK)素粒子原子核研究所理論部門 : 総合研究大学院大学; 高エネルギー加速器研究機構(KEK)素粒子原子核研究所理論部門 : 総合研究大学院大学; 大阪大学大学院理学研究科宇宙地球科学専攻; 東北大学大学院理学研究科物理学専攻; 広島大学理学部物理学科
Author Affiliation(eng)KEK Theory Center and the Graduate University for Advanced Studies (Sokendai); KEK Theory Center and the Graduate University for Advanced Studies (Sokendai); KEK Theory Center and the Graduate University for Advanced Studies (Sokendai); Department of Earth and Space Science, Graduate School of Science, Osaka University; Department of Physics, Tohoku University; Department of Physical Science, Hiroshima University; Center for Particle Astrophysics, Department of Astronomy and Astrophysics, Department of Physics, Pennsylvania State University
Issue Date2010-02-26
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構特別資料:
JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H
Start page14
End page17
Publication date2010-02-26
AbstractWe discuss that a nearby astrophysical source, such as pulsar, supernova remnant or gamma-ray burst (GRB), about 10(exp 5-6) years ago may be responsible for the excesses of cosmic-ray positrons and electrons recently observed by the PAMELA, ATIC/PPB-BETS, Fermi and HESS experiments. We can reproduce the smooth Fermi/HESS spectra as well as the spiky ATIC/PPB-BETS spectra. The spectra can possess a sharp cutoff that is similar to the dark matter predictions since higher energy cosmic-rays cool faster where the cutoff energy marks the source age. A burst-like astrophysical source is expected to have a small but finite spread in the cutoff as well as anisotropy in the cosmic-ray and diffuse gamma-ray flux, providing a method for the Fermi and future CALET experiments to discriminate between dark matter and astrophysical origins and also to constrain the source duration. Whether the source is leptonic or hadronic may be probed by the antiprotons. Such GRB-like sources may leave remnants observed as mysterious TeV unidentified sources.
DescriptionMeeting Information: The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan
Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science
Keywordscosmic rays - diffusion - gamma rays: bursts - gamma rays: theory - pulsars: general - radiation mechanism: non-thermal
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-09-008E

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