Origin of cosmic ray electrons and positrons | |
Shi, Zhao-Dong1,2; Liu, Siming1,2 | |
刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
2019-05-01 | |
卷号 | 485期号:3页码:3869-3875 |
关键词 | diffusion cosmic rays supernova remnants pulsars: general |
ISSN号 | 0035-8711 |
DOI | 10.1093/mnras/stz684 |
通讯作者 | Shi, Zhao-Dong(shizd@pmo.ac.cn) ; Liu, Siming(liusm@pmo.ac.cn) |
英文摘要 | With experimental results of AMS on the spectra of cosmic ray (CR) e(-), e(+), e(-) + e(+) and positron fraction, as well as new measurements of CR e(-) + e(+) flux by HESS, one can better understand the CR lepton (e(-) and e(+)) spectra and the puzzling electron-positron excess above similar to 10 GeV. In this article, spectra of CR e(-) and e(+) are fitted with a physically motivated simple model, and their injection spectra are obtained with a 1D propagation model including the diffusion and energy loss processes. Our results show that the electron-positron excess can be attributed to uniformly distributed sources that continuously inject into the galactic disc electron-positron with a power-law spectrum cutting off near 1 TeV and a triple power-law model is needed to fit the primary CR electron spectrum. The lower energy spectral break can be attributed to propagation effects giving rise to a broken power-law injection spectrum of primary CR electrons with a spectral hardening above similar to 40 GeV. |
WOS关键词 | GAMMA |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | OXFORD UNIV PRESS |
WOS记录号 | WOS:000474902000067 |
内容类型 | 期刊论文 |
源URL | [http://libir.pmo.ac.cn/handle/332002/27403] |
专题 | 中国科学院紫金山天文台 |
通讯作者 | Shi, Zhao-Dong; Liu, Siming |
作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210034, Jiangsu, Peoples R China 2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China |
推荐引用方式 GB/T 7714 | Shi, Zhao-Dong,Liu, Siming. Origin of cosmic ray electrons and positrons[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,485(3):3869-3875. |
APA | Shi, Zhao-Dong,&Liu, Siming.(2019).Origin of cosmic ray electrons and positrons.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,485(3),3869-3875. |
MLA | Shi, Zhao-Dong,et al."Origin of cosmic ray electrons and positrons".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 485.3(2019):3869-3875. |
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