The mass of the Galactic dark matter halo from similar to 9000 LAMOST DR5 K giants

doi:10.1088/1674-4527/18/9/113

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	The mass of the Galactic dark matter halo from similar to 9000 LAMOST DR5 K giants
	Zhai, Meng 1,2; Xue, Xiang-Xiang 1; Zhang, Lan 1; Li, Cheng-Dong 1,2; Zhao, Gang 1,2; Yang, Cheng-Qun 1,2
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2018-08-01
卷号	18 期号:9 页码:12
关键词	dark matter Galaxy: halo stars: kinematics and dynamics
ISSN号	1674-4527
DOI	10.1088/1674-4527/18/9/113
英文摘要	We constrain the mass of the Milky Way's dark matter halo, based on the kinematics of 9627 K giants at Galactocentric distances ranging over 5 kpc < r < 120 kpc drawn from LAMOST DR5. The substructure in this sample has been identified and removed carefully to enable construction of the underlying line-of-sight velocity dispersion at different radii from the Galactic center. We interpret the radial profile of the line-of-sight velocity dispersion using a spherical Jeans equation under the assumptions of anisotropy/isotropy and that radial velocity dispersion is approximately equal to line-of-sight velocity dispersion sigma(r)(r) approximate to sigma(los)(r). If we assume that the dark matter halo follows an NFW profile and the stellar halo is isotropic (beta = 0), then sigma(los)(r) can be directly used to estimate the virial mass of the Galactic dark matter halo, M-vir = 1.08(-0.14)(+0.17) x 10(12) M-circle dot, and concentration parameter c = 18.5(-2.9)(+3.6). In case that the stellar halo is anisotropic, we cannot avoid differentiation of sparse velocity dispersions according to the Jeans equation, which may cause overestimation of the mass. We use an isotropic case to test and find that d ln(sigma(2)(los)(r))/d ln r overestimates the virial mass by 15% but within 1-sigma error. We use d ln(sigma(2)(los)(r))/d ln r to fit the NFW profile and get M-vir = 1.11(-0.20)(+0.24) x 10(12) M-circle dot and c = 13.8(-2.2)(+3.0) in case of beta = 0.3.
资助项目	National Natural Science Foundation of China[11390371/2] ; National Natural Science Foundation of China[11573032] ; National Natural Science Foundation of China[11773033] ; "Recruitment Program of Global Youth Experts" of China ; National Development and Reform Commission
WOS关键词	TRACING GALAXY FORMATION ; MILKY-WAY HALO ; ROTATION CURVE ; SPECTROSCOPIC SURVEY ; TELESCOPE LAMOST ; KINEMATICS ; STARS ; SUBSTRUCTURE ; SATELLITES ; ABUNDANCE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号	WOS:000445688500009
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; "Recruitment Program of Global Youth Experts" of China ; "Recruitment Program of Global Youth Experts" of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "Recruitment Program of Global Youth Experts" of China ; "Recruitment Program of Global Youth Experts" of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "Recruitment Program of Global Youth Experts" of China ; "Recruitment Program of Global Youth Experts" of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "Recruitment Program of Global Youth Experts" of China ; "Recruitment Program of Global Youth Experts" of China ; National Development and Reform Commission ; National Development and Reform Commission
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/22716]
专题	中国科学院国家天文台
通讯作者	Xue, Xiang-Xiang
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhai, Meng,Xue, Xiang-Xiang,Zhang, Lan,et al. The mass of the Galactic dark matter halo from similar to 9000 LAMOST DR5 K giants[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(9):12.
APA	Zhai, Meng,Xue, Xiang-Xiang,Zhang, Lan,Li, Cheng-Dong,Zhao, Gang,&Yang, Cheng-Qun.(2018).The mass of the Galactic dark matter halo from similar to 9000 LAMOST DR5 K giants.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(9),12.
MLA	Zhai, Meng,et al."The mass of the Galactic dark matter halo from similar to 9000 LAMOST DR5 K giants".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.9(2018):12.