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GeV excess in the Milky Way: The role of diffuse galactic gamma-ray emission templates
Zhou, Bei1,2; Liang, Yun-Feng1,2; Huang, Xiaoyuan1; Li, Xiang1,2; Fan, Yi-Zhong1; Feng, Lei1; Chang, Jin1
2015-06-18
发表期刊PHYSICAL REVIEW D
卷号91期号:12页码:123-010
摘要Several groups have analyzed the publicly available Fermi-LAT data and have reported a spatially extended. ray excess of around 1-3 GeV from the region surrounding the Galactic center that might originate from annihilation of dark-matter particles with a rest mass m(chi) similar to 30-40 GeV. In this work we examine the role of the diffuse galactic gamma-ray emission templates played in suppressing the GeV excess. For such a purpose, we adopt in total 128 background templates that were generated by Ackermann et al. [Astrophys. J. 750, 3 (2012)] in the study of the Fermi-LAT observations of the diffuse gamma-ray emission considering the effects of cosmic rays and the interstellar medium. The possible GeV excess, assumed to follow the spatial distribution of the prompt gamma rays produced in the annihilation of dark-matter particles taking a generalized Navarro-Frenk-White profile with an inner slope alpha=1.2, has been analyzed in some regions of interest. The introduction of such an additional component centered at the Galactic center is found to have improved the goodness of fit to the data significantly in all background template models regardless of whether the excess spectrum is fixed or not. Our results thus suggest that the presence of a statistically significant GeV excess in the inner Galaxy is robust, though its spectrum depends on the diffuse galactic gamma-ray emission model adopted in the analysis. The possible physical origin of the GeV excess component is discussed and, in the dark-matter model, the annihilation cross section of such particles is evaluated.
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
学科领域天文和天体物理
DOI10.1103/PhysRevD.91.123010
关键词[WOS]LARGE-AREA TELESCOPE ; DARK-MATTER ; RADIAL-DISTRIBUTION ; SPACE-TELESCOPE ; SOURCE CATALOG ; COSMIC-RAYS ; PULSARS ; GALAXY ; CONSTRAINTS ; CANDIDATES
收录类别SCI
语种英语
资助项目PMO_LIB-IR
WOS研究方向Astronomy & Astrophysics ; Physics
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000356472500001
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/14798
专题暗物质和空间天文实验室
作者单位1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Zhou, Bei,Liang, Yun-Feng,Huang, Xiaoyuan,et al. GeV excess in the Milky Way: The role of diffuse galactic gamma-ray emission templates[J]. PHYSICAL REVIEW D,2015,91(12):123-010.
APA Zhou, Bei.,Liang, Yun-Feng.,Huang, Xiaoyuan.,Li, Xiang.,Fan, Yi-Zhong.,...&Chang, Jin.(2015).GeV excess in the Milky Way: The role of diffuse galactic gamma-ray emission templates.PHYSICAL REVIEW D,91(12),123-010.
MLA Zhou, Bei,et al."GeV excess in the Milky Way: The role of diffuse galactic gamma-ray emission templates".PHYSICAL REVIEW D 91.12(2015):123-010.
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