Mapping the Milky Way with LAMOST - II. The stellar halo
文献类型：期刊论文
| 作者 | 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 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2018 |
| 卷号 | 473期号:1页码:1244-1257 |
| 关键词 | Galaxy: Fundamental Parameters Galaxy: Halo Galaxy: Structure |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/stx2361 |
| 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研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000415653600093 |
| 出版者 | OXFORD UNIV PRESS |
| 源URL | [http://119.78.226.72/handle/331011/32443]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Xu, Yan; Liu, Chao |
| 作者单位 | 1.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 |
| 推荐引用方式 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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来源：上海天文台
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