Cosmic-ray hardenings in light of AMS-02 data

被引：36
作者：
Ohira, Yutaka [1 ]
Kawanaka, Norita [2 ]
Ioka, Kunihito [3 ,4 ]
机构：
[1] Aoyama Gakuin Univ, Dept Math & Phys, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 2525258, Japan
[2] Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan
[3] KEK, Inst Particle & Nucl Studies, Theory Ctr, Tsukuba, Ibaraki 3050801, Japan
[4] Grad Univ Adv Studies, SOKENDAI, Dept Particle & Nucl Phys, Tsukuba, Ibaraki 3050801, Japan
来源：
PHYSICAL REVIEW D | 2016年 / 93卷 / 08期
关键词：
SUPERNOVA-REMNANTS; HELIUM SPECTRA; PARTICLE-ACCELERATION; INTERSTELLAR-MEDIUM; OB ASSOCIATIONS; ORIGIN; SUPERBUBBLES; GALAXY; PROTON; EJECTA;
D O I：
10.1103/PhysRevD.93.083001
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Recent precise observations of cosmic rays (CRs) by AMS-02 experiment clearly show (1) harder spectra of helium and carbon compared to protons by alpha R-0.08, and (2) concave breaks in proton and helium spectra at a rigidity R similar to 300 GV. In particular the helium and carbon spectra are exactly similar, pointing to the same acceleration site. We examine possible interpretations of these features and identify a chemically enriched region, that is, superbubbles as the most probable origin of Galactic CRs in high rigidity R > 30 GV. The similar spectra of CR carbon and helium further suggest that the CRs with R > 30 GV originate from the supernova ejecta in the superbubble core, mixed with comparable or less amount of interstellar medium. We predict similar spectra for heavy nuclei.
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页数：7
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