CONSTRAINING THE DISTRIBUTION OF DARK MATTER IN THE INNER GALAXY WITH AN INDIRECT DETECTION SIGNAL: THE CASE OF A TENTATIVE 130 GeV gamma-RAY LINE

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	CONSTRAINING THE DISTRIBUTION OF DARK MATTER IN THE INNER GALAXY WITH AN INDIRECT DETECTION SIGNAL: THE CASE OF A TENTATIVE 130 GeV gamma-RAY LINE
	Yang, Rui-Zhi 1,2; Feng, Lei 1; Li, Xiang 1,2; Fan, Yi-Zhong1
刊名	ASTROPHYSICAL JOURNAL
	2013-06-20
卷号	770 期号:2 页码:0
关键词	dark matter galaxies: structure gamma rays: general
ISSN号	0004-637X
通讯作者	Yang, RZ (reprint author), Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China. Email: yzfan@pmo.ac.cn
英文摘要	Dark matter distribution in the very inner region of our Galaxy is still debated. In N-body simulations, a cuspy dark matter halo density profile is favored. Several dissipative baryonic processes, however, are found to be able to significantly flatten dark matter distribution, and a cored dark matter halo density profile is possible. Baryons dominate the gravitational potential in the inner Galaxy, hence a direct constraint on the abundance of dark matter particles is rather challenging. Recently, a few groups have identified a tentative 130 GeV line signal in the Galactic center, which could be interpreted as the signal of dark matter annihilation. Using current 130 GeV line data and adopting the generalized Navarro-Frenk-White profile of the dark matter halo-local dark matter density rho(0) = 0.4 GeV cm(-3) and r(s) = 20 kpc-we obtain a 95% confidence level lower (upper) limit on the inner slope of dark matter density distribution, alpha = 1.06 (the cross section of dark matter annihilation into gamma-rays (xx -> gamma gamma) = 1.3 x 10(-27) cm(3) s(-1)). Such a slope is consistent with the results of some N-body simulations and, if the signal is due to dark matter, suggests that baryonic processes may be unimportant.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	HALOS ; CONDENSATION ; CONTRACTION ; FEEDBACK ; CUSPS ; CORES ; MILKY
收录类别	SCI
语种	英语
WOS记录号	WOS:000320111200045
公开日期	2014-01-08
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/9887]
专题	紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组
作者单位	1.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 100012, Peoples R China
推荐引用方式 GB/T 7714	Yang, Rui-Zhi,Feng, Lei,Li, Xiang,et al. CONSTRAINING THE DISTRIBUTION OF DARK MATTER IN THE INNER GALAXY WITH AN INDIRECT DETECTION SIGNAL: THE CASE OF A TENTATIVE 130 GeV gamma-RAY LINE[J]. ASTROPHYSICAL JOURNAL,2013,770(2):0.
APA	Yang, Rui-Zhi,Feng, Lei,Li, Xiang,&Fan, Yi-Zhong.(2013).CONSTRAINING THE DISTRIBUTION OF DARK MATTER IN THE INNER GALAXY WITH AN INDIRECT DETECTION SIGNAL: THE CASE OF A TENTATIVE 130 GeV gamma-RAY LINE.ASTROPHYSICAL JOURNAL,770(2),0.
MLA	Yang, Rui-Zhi,et al."CONSTRAINING THE DISTRIBUTION OF DARK MATTER IN THE INNER GALAXY WITH AN INDIRECT DETECTION SIGNAL: THE CASE OF A TENTATIVE 130 GeV gamma-RAY LINE".ASTROPHYSICAL JOURNAL 770.2(2013):0.