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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
Source PublicationPHYSICAL REVIEW D
Volume91Issue:12Pages:123-010
AbstractSeveral 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.
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1103/PhysRevD.91.123010
WOS KeywordLARGE-AREA TELESCOPE ; DARK-MATTER ; RADIAL-DISTRIBUTION ; SPACE-TELESCOPE ; SOURCE CATALOG ; COSMIC-RAYS ; PULSARS ; GALAXY ; CONSTRAINTS ; CANDIDATES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000356472500001
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/14798
Collection暗物质和空间天文实验室
Affiliation1.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
Recommended Citation
GB/T 7714
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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