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Morphology of gamma-ray emission induced by e(+/-) from annihilating self-interacting dark matter
Cui, Ming-Yang1,2; Zhang, Cun1,2; Zong, Hong-Shi1
2016-06-13
Source PublicationPHYSICAL REVIEW D
Volume93Issue:12
AbstractWith the Fermi-LAT data, quite a few research groups have reported a spatially extended GeV gamma-ray excess surrounding the Galactic center ( GC). The physical origin of such a GeV excess is still unclear, and one interesting possibility is the inverse Compton scattering of the electrons and positrons from annihilation of self-interacting dark matter (SIDM) particles with the interstellar optical photons. In this work, we calculate the morphology of such a gamma-ray emission. For the annihilation channel of (chi) over bar chi -> phi phi -> e(+)e(-)e(+)e(-), the inverse Compton scattering (ICS) dominates over the bremsstrahlung on producing the GeV gamma-ray emission. For the SIDM particles with a rest mass m(chi) similar to tens GeV that may be favored by the modeling of the Galactic GeV excess, the ICS radiation at GeV energies concentrates along the Galactic plane. The degrees of asymmetry high up to >= 0.3 are found in some regions of interest, which in turn proposes a plausible test on the SIDM interpretation of the GeV excess.
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1103/PhysRevD.93.123516
WOS KeywordFERMI-LAT OBSERVATIONS ; GALACTIC-CENTER ; EXCESS ; CONSTRAINTS ; PROPAGATION ; CANDIDATES ; ELECTRONS ; ENERGIES ; HALOES ; SIGNAL
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000377805500003
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16252
Collection暗物质和空间天文实验室
Affiliation1.Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Cui, Ming-Yang,Zhang, Cun,Zong, Hong-Shi. Morphology of gamma-ray emission induced by e(+/-) from annihilating self-interacting dark matter[J]. PHYSICAL REVIEW D,2016,93(12).
APA Cui, Ming-Yang,Zhang, Cun,&Zong, Hong-Shi.(2016).Morphology of gamma-ray emission induced by e(+/-) from annihilating self-interacting dark matter.PHYSICAL REVIEW D,93(12).
MLA Cui, Ming-Yang,et al."Morphology of gamma-ray emission induced by e(+/-) from annihilating self-interacting dark matter".PHYSICAL REVIEW D 93.12(2016).
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