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'Excess' of primary cosmic ray electrons
Li, Xiang1,2; Shen, Zhao-Qiang1,2; Lu, Bo-Qiang1,3; Dong, Tie-Kuang1; Fan, Yi-Zhong1,4; Feng, Lei1; Liu, Si-Ming1; Chang, Jin1,4
2015-10-07
Source PublicationPHYSICS LETTERS B
Volume749Pages:267-271
AbstractWith the accurate cosmic ray (CR) electron and positron spectra (denoted as Phi(e-) and Phi(e+), respectively) measured by AMS-02 Collaboration, the difference between the electron and positron fluxes (i.e., Delta Phi = Phi(e-) - Phi(e+)), dominated by the propagated primary electrons, can be reliably inferred. In the standard model, the spectrum of propagated primary CR electrons at energies = 30 GeV softens with the increase of energy. The absence of any evidence for such a continuous spectral softening in Delta Phi strongly suggests a significant 'excess' of primary CR electrons and at energies of 100-400 GeV the identified excess component has a flux comparable to that of the observed positron excess. Middle-age but 'nearby' supernova remnants (e.g., Monogem and Geminga) are favored sources for such an excess. (C) 2015 The Authors. Published by Elsevier B.V.
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.physletb.2015.08.001
WOS KeywordSUPERNOVA-REMNANTS ; POSITRON FRACTION ; DARK-MATTER ; SPECTRA ; PROPAGATION ; PULSARS ; LOOP ; CONSTRAINTS ; ENERGIES ; MODELS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields
WOS IDWOS:000361562900037
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16072
Collection暗物质和空间天文实验室
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100012, Peoples R China
3.Nanjing Univ, Sch Phys, Nanjing 210092, Jiangsu, Peoples R China
4.Nanjing Univ, Collaborat Innovat Ctr Modern Astron & Space Expl, Nanjing 210046, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Li, Xiang,Shen, Zhao-Qiang,Lu, Bo-Qiang,et al. 'Excess' of primary cosmic ray electrons[J]. PHYSICS LETTERS B,2015,749:267-271.
APA Li, Xiang.,Shen, Zhao-Qiang.,Lu, Bo-Qiang.,Dong, Tie-Kuang.,Fan, Yi-Zhong.,...&Chang, Jin.(2015).'Excess' of primary cosmic ray electrons.PHYSICS LETTERS B,749,267-271.
MLA Li, Xiang,et al."'Excess' of primary cosmic ray electrons".PHYSICS LETTERS B 749(2015):267-271.
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