Mapping the Milky Way with LAMOST - II. The stellar halo

doi:10.1093/mnras/stx2361

	Mapping the Milky Way with LAMOST - II. The stellar halo
	Hou, Yonghui 1; Carlin, Jeffrey L.4; Li, Jing 5; Zhang, Yong 1; Newberg, Heidi Jo 3; Xue, Xiang-Xiang 2; Liu, Chao2 ; Xu, Yan2 ; Cao, Zihuang2 ; Wang, Yuefei 1
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018
卷号	473 期号:1 页码:1244-1257
关键词	Galaxy: Fundamental Parameters Galaxy: Halo Galaxy: Structure
DOI	10.1093/mnras/stx2361
文献子类	Article
英文摘要	The radial number density and flattening of the Milky Way's stellar halo is measured with 5351 metal-poor ([Fe/H] < -1) K giants from The Large sky Area Multi-Object fiber Spectroscopic Telescope Data Release 3 (LAMOST DR3), using a non-parametric method, which is model independent and largely avoids the influence of halo substucture. The number density profile is well described by a single power law with index 5.03(-0.64)(+0.64) and flattening that varies with radius. The stellar halo traced by LAMOST K giants is more flattened at smaller radii, and becomes nearly spherical at larger radii. The flattening, q, is about 0.64, 0.8 and 0.96 at r = 15, 20 and 30 kpc (where r = root R-2 + [Z/q (r)](2)), respectively. Moreover, the leading arm of the Sagittarius dwarf galaxy tidal stream in the north, and the trailing arm in the south, is significant in the residual map of density distribution. In addition, an unknown overdensity is identified in the residual map at (R, Z) = (30, 15) kpc.
WOS关键词	RR-LYRAE STARS ; TELESCOPE LAMOST ; GALACTIC HALO ; STRIPE 82 ; COUNTS ; GALAXY ; SAGITTARIUS ; KINEMATICS ; TEMPLATES ; DISTANCE
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000415653600093
资助机构	Chinese Academy of Sciences(XDB09000000) ; Chinese Academy of Sciences(XDB09000000) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; National Natural Science Foundation of China(11373032 ; National Natural Science Foundation of China(11373032 ; NSFC(11233004 ; NSFC(11233004 ; "Recruitment Program of Global Youth Experts" of China ; "Recruitment Program of Global Youth Experts" of China ; US NSF(AST 16-15688) ; US NSF(AST 16-15688) ; National Development and Reform Commission ; National Development and Reform Commission ; 11333003) ; 11333003) ; 11390371) ; 11390371) ; Chinese Academy of Sciences(XDB09000000) ; Chinese Academy of Sciences(XDB09000000) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; National Natural Science Foundation of China(11373032 ; National Natural Science Foundation of China(11373032 ; NSFC(11233004 ; NSFC(11233004 ; "Recruitment Program of Global Youth Experts" of China ; "Recruitment Program of Global Youth Experts" of China ; US NSF(AST 16-15688) ; US NSF(AST 16-15688) ; National Development and Reform Commission ; National Development and Reform Commission ; 11333003) ; 11333003) ; 11390371) ; 11390371)
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/20287]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Da Tun Rd 20A, Beijing 100012, Peoples R China 3.Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Tory, NY 12180 USA 4.LSST, 950 North Cherry Ave, Tucson, AZ 85719 USA 5.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Galaxies & Cosmol, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Hou, Yonghui,Carlin, Jeffrey L.,Li, Jing,et al. Mapping the Milky Way with LAMOST - II. The stellar halo[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,473(1):1244-1257.
APA	Hou, Yonghui.,Carlin, Jeffrey L..,Li, Jing.,Zhang, Yong.,Newberg, Heidi Jo.,...&Deng, Li-Cai.(2018).Mapping the Milky Way with LAMOST - II. The stellar halo.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,473(1),1244-1257.
MLA	Hou, Yonghui,et al."Mapping the Milky Way with LAMOST - II. The stellar halo".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473.1(2018):1244-1257.