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题名: GeV excess in the Milky Way: The role of diffuse galactic gamma-ray emission templates
作者: Zhou, Bei1, 2; Liang YunFeng(梁云峰)1, 2; Huang, Xiaoyuan1; Li, Xiang1, 2; Fan YiZhong(范一中)1; Feng, Lei1; Chang Jin(常进)1
刊名: PHYSICAL REVIEW D
出版日期: 2015-06-18
卷号: 91, 期号:12, 页码:123-010
学科分类: 天文和天体物理
DOI: 10.1103/PhysRevD.91.123010
文章类型: Article
英文摘要: 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.
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]: LARGE-AREA TELESCOPE ; DARK-MATTER ; RADIAL-DISTRIBUTION ; SPACE-TELESCOPE ; SOURCE CATALOG ; COSMIC-RAYS ; PULSARS ; GALAXY ; CONSTRAINTS ; CANDIDATES
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000356472500001
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14798
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.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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