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Implications of the AMS-02 positron fraction in cosmic rays
Yuan Q(袁强); Bi XJ(毕效军); Chen GM(陈国明); Guo YQ(郭义庆); Lin SJ(林苏杰); Zhang XM(张新民); Yuan, Q; Bi, XJ; Chen, GM; Guo, YQ; Lin, SJ; Zhang, XM
Corresponding Author毕效军
AbstractThe AMS-02 collaboration has just released its first result of the cosmic positron fraction e(+)/(e(-) + e(+)) with high precision up to similar to 350 GeV. The AMS-02 result shows the same trend with the previous PAMELA result, which requires extra electron/positron sources on top of the conventional cosmic ray background, either from astrophysical sources or from dark matter annihilation/decay. In this paper we try to figure out the nature of the extra sources by fitting to the AMS-02 e(+)/(e(-) + e(+)) data, as well as the electron and proton spectra by PAMELA and the (e(-) + e(+)) spectrum by Fermi and HESS. We adopt the GALPROP package to calculate the propagation of the Galactic cosmic rays and the Markov Chain Monte Carlo sampler to do the fit. We find that under the conventional assumptions about the background and the extra source of the e(-) + e(+), we cannot fit the AMS-02 and Fermi/HESS data well simultaneously. The AMS-02 data require less electrons/positrons from the extra sources than that required by Fermi/HESS. It may indicate that the model needs to be refined or the data between these experiments have systematic uncertainties. The pulsar scenario generally fits the data better than the DM scenario. Furthermore, the constraints from gamma-rays also disfavor the DM scenario to explain the cosmic ray lepton data. (C) 2014 Elsevier B.V. All rights reserved.
KeywordPositron fraction Dark matter AMS02 Pulsar
Subject AreaAstronomy & Astrophysics; Physics
WOS Research AreaAstronomy & Astrophysics ; Physics, Particles & Fields
WOS SubjectAstronomy & Astrophysics ; Physics
WOS IDWOS:000343344700001
ADS Bibcode2015APh....60....1Y
ADS URLhttps://ui.adsabs.harvard.edu/abs/2015APh....60....1Y
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2015APh....60....1Y/citations
Citation statistics
Cited Times:88 [INSPIRE]
Cited Times:86 [ADS]
Document Type期刊论文
Recommended Citation
GB/T 7714
Yuan Q,Bi XJ,Chen GM,et al. Implications of the AMS-02 positron fraction in cosmic rays[J]. ASTROPARTICLE PHYSICS,2015,60:1-12.
APA 袁强.,毕效军.,陈国明.,郭义庆.,林苏杰.,...&Zhang, XM.(2015).Implications of the AMS-02 positron fraction in cosmic rays.ASTROPARTICLE PHYSICS,60,1-12.
MLA 袁强,et al."Implications of the AMS-02 positron fraction in cosmic rays".ASTROPARTICLE PHYSICS 60(2015):1-12.
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