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题名: Morphology of gamma-ray emission induced by e(+/-) from annihilating self-interacting dark matter
作者: Cui, Ming-Yang1, 2; Zhang, Cun1, 2; Zong, Hong-Shi1
刊名: PHYSICAL REVIEW D
出版日期: 2016-06-13
卷号: 93, 期号:12
DOI: 10.1103/PhysRevD.93.123516
文章类型: Article
英文摘要: With 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标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]: Astronomy & Astrophysics ; Physics
关键词[WOS]: FERMI-LAT OBSERVATIONS ; GALACTIC-CENTER ; EXCESS ; CONSTRAINTS ; PROPAGATION ; CANDIDATES ; ELECTRONS ; ENERGIES ; HALOES ; SIGNAL
收录类别: SCI
项目资助者: National Natural Science Foundation of China(11275097 ; 11475085 ; 11535005)
语种: 英语
WOS记录号: WOS:000377805500003
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16252
Appears in Collections:暗物质和空间天文实验室_期刊论文

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作者单位: 1.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
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