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Origin of cosmic ray electrons and positrons
Shi, Zhao-Dong1,2; Liu, Siming1,2
2019-05-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume485Issue:3Pages:3869-3875
Corresponding AuthorShi, Zhao-Dong(shizd@pmo.ac.cn) ; Liu, Siming(liusm@pmo.ac.cn)
AbstractWith 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.
Keyworddiffusion cosmic rays supernova remnants pulsars: general
DOI10.1093/mnras/stz684
WOS KeywordGAMMA
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000474902000067
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27404
Collection中国科学院紫金山天文台
Corresponding AuthorShi, Zhao-Dong; Liu, Siming
Affiliation1.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
Recommended Citation
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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