The Density Profile and Kinematics of the Milky Way with RR Lyrae Stars
文献类型：期刊论文
| 作者 | Ablimit, Iminhaji1,2; Zhao, Gang1
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018-03-10 |
| 卷号 | 855期号:2页码:4 |
| 关键词 | Galaxy: disk Galaxy: general Galaxy: halo stars: variables: RR Lyrae |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aaac7f |
| 英文摘要 | Most of the known RR Lyraes are type ab RR Lyraes (RRLab), and they are an excellent tool to map the Milky Way and its substructures. We find that 1148 RRLab stars determined by Drake et al. have been observed by spectroscopic surveys of SDSS and LAMOST. We derived the radial velocity dispersion, circular velocity, and mass profile from 860 halo tracers in Paper I. Here we present the stellar densities and radial velocity distributions of the thick disk and halo of the Milky Way. The 288 RRLab stars located in the thick disk have the mean metallicity of [Fe/H] = -1.02. Three thick disk tracers have a radial velocity lower than 215 km s(-1). With 860 halo tracers, which have a mean metallicity of [Fe/H] = -1.33, we find a double power law of n(r) proportional to r(-2.8) and n(r) proportional to r(-4.8) with a break distance of 21 kpc to express the halo stellar density profile. The radial velocity dispersion at 50 kpc is around 78 km s(-1). |
| WOS关键词 | DIGITAL SKY SURVEY ; STELLAR HALO ; GALACTIC HALO ; STRIPE 82 ; LAMOST ; SUBSTRUCTURE ; GALAXY ; VIEW ; SDSS ; DISC |
| 资助项目 | JSPS Postdoctoral fellowship of Japan[P17022] ; JSPS KAKENHI[17F17022] ; National Natural Science Foundation of China[11390371] ; National Natural Science Foundation of China[11233004] ; National Development and Reform Commission |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000427634000004 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | JSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission ; JSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission ; JSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission ; JSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/35656]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Ablimit, Iminhaji |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Kyoto Univ, Dept Astron, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan |
| 推荐引用方式 GB/T 7714 | Ablimit, Iminhaji,Zhao, Gang. The Density Profile and Kinematics of the Milky Way with RR Lyrae Stars[J]. ASTROPHYSICAL JOURNAL,2018,855(2):4. |
| APA | Ablimit, Iminhaji,&Zhao, Gang.(2018).The Density Profile and Kinematics of the Milky Way with RR Lyrae Stars.ASTROPHYSICAL JOURNAL,855(2),4. |
| MLA | Ablimit, Iminhaji,et al."The Density Profile and Kinematics of the Milky Way with RR Lyrae Stars".ASTROPHYSICAL JOURNAL 855.2(2018):4. |
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来源：国家天文台
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