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Ding, Yu-Chen; Li, Nan; Wei, Chun-Cheng; Wu, Yue-Liang; Zhou, Yu-Feng
Implications of a possible TeV break in the cosmic-ray electron and positron flux
Source PublicationPHYSICAL REVIEW D
AbstractA TeV spectral break in the total flux of cosmic-ray electrons and positrons (CREs) at which the spectral power index softens from similar to 3 to similar to 4 has been observed by H.E.S.S. and recently confirmed by DAMPE with a high significance of 6.6 sigma. Such an observation is apparently inconsistent with the data from other experiments such as Fermi-LAT, AMS-02, and CALET. We perform a global analysis on the latest CRE data including Fermi-LAT, AMS-02, CALET, DAMPE, and H.E.S.S., with energy scale uncertainties taken into account to improve the consistency between the datasets. The fit result strongly favors the existence of the break at similar to 1 TeV with an even higher statistical significance of 13.3 sigma. In view of the tentative CRE break, we revisit a number of models of nearby sources, such as a single generic pulsar wind nebula (PWN), known multiple PWNe from the ATNF catalog, and their combinations with either an additional dark matter (DM) component or a supernova remnant (SNR). We show that the CRE break at similar to 1 TeV, together with the known CR positron excess, points towards the possibility that the nearby sources should be highly charge asymmetric. Among the models under consideration, the one with a PWN plus a SNR is the most favored by the current data. The favored distances and ages of the PWN and SNR sources are both within 0.6 kpc and around 10(5) yr, respectively. Possible candidate sources include PSR J0954-5430, Vela and the Monogem ring, etc. We find that for the models under consideration, the additional DM component is either unnecessary or predicts too much photon emission in tension with the H.E.S.S. data of gamma-rays from the direction of the Galactic Center. We also show that the current measurement of the anisotropies in the arrival direction of the CRE can be useful in determining the properties of the sources.
Cooperation Status国内
Subject AreaAstronomy & Astrophysics ; Physics
MOST Discipline CatalogueAstronomy & Astrophysics ; Physics, Particles & Fields
Indexed BySCIE
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Document Type期刊论文
Affiliation1.[Ding, Yu-Chen
2.Li, Nan
3.Wei, Chun-Cheng
4.Wu, Yue-Liang
5.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
7.[Wu, Yue-Liang
8.UCAS, Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, Hangzhou 310024, Peoples R China
9.Int Ctr Theoret Phys Asia Pacific, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Ding, Yu-Chen,Li, Nan,Wei, Chun-Cheng,et al. Implications of a possible TeV break in the cosmic-ray electron and positron flux[J]. PHYSICAL REVIEW D,2021,103(11):115010.
APA Ding, Yu-Chen,Li, Nan,Wei, Chun-Cheng,Wu, Yue-Liang,&Zhou, Yu-Feng.(2021).Implications of a possible TeV break in the cosmic-ray electron and positron flux.PHYSICAL REVIEW D,103(11),115010.
MLA Ding, Yu-Chen,et al."Implications of a possible TeV break in the cosmic-ray electron and positron flux".PHYSICAL REVIEW D 103.11(2021):115010.
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