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The spatial distribution of dark matter annihilation originating from a gamma-ray line signal
Lu, Tong-Suo1,2; Dong, Tie-Kuang1; Wu, Jian1
2014-05-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume14Issue:5Pages:520-526
AbstractThe GeV - TeV gamma-ray line signal is the smoking gun signature of dark matter annihilation or decay. The detection of such a signal is one of the main targets of some space-based telescopes, including Fermi-LAT and the upcoming missions CALET, DAMPE and Gamma-400. An important feature of gamma-ray line photons that originate from dark-matter-annihilation is that they are concentrated at the center of the Galaxy. So far, no reliable gamma-ray line has been detected by Fermi-LAT, and the upper limits on the cross section of annihilation into gamma-rays have been reported. We use these upper limits to estimate the "maximal" number of gamma-ray line photons detectable for Fermi-LAT, DAMPE and Gamma-400, and then investigate the spatial distribution of these photons. We show that the center of the distribution will usually be offset from the Galactic center (Sgr A*) due to the limited statistics. Such a result is almost independent of models of the dark matter distribution, and will render the reconstruction of the dark matter distribution with the gamma-ray line signal very challenging for foreseeable space-based detectors.
KeywordCosmology: Observations Cosmology: Dark Matter Galaxy: Center Instrumentation: Detectors
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/1674-4527/14/5/002
WOS KeywordGALAXY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000335513000002
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10561
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.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Lu, Tong-Suo,Dong, Tie-Kuang,Wu, Jian. The spatial distribution of dark matter annihilation originating from a gamma-ray line signal[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2014,14(5):520-526.
APA Lu, Tong-Suo,Dong, Tie-Kuang,&Wu, Jian.(2014).The spatial distribution of dark matter annihilation originating from a gamma-ray line signal.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,14(5),520-526.
MLA Lu, Tong-Suo,et al."The spatial distribution of dark matter annihilation originating from a gamma-ray line signal".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 14.5(2014):520-526.
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