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Mapping the Milky Way with LAMOST - II. The stellar halo
Xu, Yan1; Liu, Chao1; Xue, Xiang-Xiang1; Newberg, Heidi Jo2; Carlin, Jeffrey L.3; Xia, Qi-Ran1; Deng, Li-Cai1; Li, Jing4; Zhang, Yong5; Hou, Yonghui5; Wang, Yuefei5; Cao, Zihuang1
2018
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume473Issue:1Pages:1244-1257
AbstractThe 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.
SubtypeArticle
KeywordGalaxy: Fundamental Parameters Galaxy: Halo Galaxy: Structure
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationChinese 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)
DOI10.1093/mnras/stx2361
WOS KeywordRR-LYRAE STARS ; TELESCOPE LAMOST ; GALACTIC HALO ; STRIPE 82 ; COUNTS ; GALAXY ; SAGITTARIUS ; KINEMATICS ; TEMPLATES ; DISTANCE
Indexed BySCI
Language英语
Funding OrganizationChinese 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)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000415653600093
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20279
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Da Tun Rd 20A, Beijing 100012, Peoples R China
2.Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Tory, NY 12180 USA
3.LSST, 950 North Cherry Ave, Tucson, AZ 85719 USA
4.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Galaxies & Cosmol, Shanghai 200030, Peoples R China
5.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Xu, Yan,Liu, Chao,Xue, Xiang-Xiang,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 Xu, Yan.,Liu, Chao.,Xue, Xiang-Xiang.,Newberg, Heidi Jo.,Carlin, Jeffrey L..,...&Cao, Zihuang.(2018).Mapping the Milky Way with LAMOST - II. The stellar halo.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,473(1),1244-1257.
MLA Xu, Yan,et al."Mapping the Milky Way with LAMOST - II. The stellar halo".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473.1(2018):1244-1257.
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