Galactic Rotation and the Oort Constants in the Solar Vicinity
文献类型：期刊论文
| 作者 | Li,Chengdong1,2; Zhao,Gang1,2 ; Yang,Chengqun1,2
|
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-02-26 |
| 卷号 | 872期号:2 |
| 关键词 | Galaxy: disk Galaxy: fundamental parameters Galaxy: kinematics and dynamics Galaxy: structure solar neighborhood |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab0104 |
| 英文摘要 | Abstract Gaia DR2 data are used to calculate the Oort constants and derive the Galactic rotational properties in this work. We choose the solar vicinity stars with a “clean” sample within 500 pc. The Oort constants are then fitted through the relation between the proper motions as a function of Galactic longitude l. A maximum likelihood method is adopted to obtain the Oort constants and the uncertainties are produced by a Markov Chain Monte Carlo technique with the sample. Our results for the Oort constants are A?=?15.1?±?0.1 km s?1 kpc?1, B?=??13.4?±?0.1 km s?1 kpc?1, C?=??2.7?±?0.1 km s?1 kpc?1, and K?=??1.7?±?0.2 km s?1 kpc?1 respectively. The nonzero values of C and K represent a nonaxisymmetric model for the Galaxy. According to our results, the angular velocity and the circular velocity decreases in solar vicinity. The local radial velocity also decreases along the radial direction due to C?+?K being negative. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-872-2-AB0104 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/25113]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China gzhao@nao.cas.cn |
| 推荐引用方式 GB/T 7714 | Li,Chengdong,Zhao,Gang,Yang,Chengqun. Galactic Rotation and the Oort Constants in the Solar Vicinity[J]. The Astrophysical Journal,2019,872(2). |
| APA | Li,Chengdong,Zhao,Gang,&Yang,Chengqun.(2019).Galactic Rotation and the Oort Constants in the Solar Vicinity.The Astrophysical Journal,872(2). |
| MLA | Li,Chengdong,et al."Galactic Rotation and the Oort Constants in the Solar Vicinity".The Astrophysical Journal 872.2(2019). |
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来源：国家天文台
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