The Rotation Curve, Mass Distribution, and Dark Matter Content of the Milky Way from Classical Cepheids
文献类型：期刊论文
| 作者 | Ablimit, Iminhaji1,3; Zhao, Gang3 ; Flynn, Chris2; Bird, Sarah A.3
|
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2020-05-01 |
| 卷号 | 895期号:1页码:8 |
| 关键词 | Dark matter density Galaxy mass distribution Milky Way dark matter halo Milky Way dynamics Cepheid variable stars Galaxy rotation curves Dark matter |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/ab8d45 |
| 英文摘要 | With the increasing number of large stellar survey projects, the quality and quantity of excellent tracers for studying the Milky Way are rapidly growing, one of which is the classical Cepheids. Classical Cepheids are high-precision standard candles with very low typical uncertainties (<3%) available via the mid-infrared period-luminosity relation. About 3500 classical Cepheids identified from the Optical Gravitational Lensing Experiment, All-Sky Automated Survey for Supernova, Gaia, Wide-field Infrared Survey Explorer, and Zwicky Transient Facility survey data have been analyzed in this work, and their spatial distributions show a clear signature of Galactic warp. Two kinematical methods are adopted to measure the Galactic rotation curve (RC) in the Galactocentric distance range of 4 less than or similar to R-GC less than or similar to 19 kpc. Gently declining RCs are derived by both the proper motion (PM) method and three-dimensional velocity vector (3DV) method. The largest sample of classical Cepheids with the most accurate 6D phase-space coordinates available to date are modeled in the 3DV method, and the resulting RC is found to decline at the relatively smaller gradient of (-1.33 +/- 0.1) km s(-1) kpc(-1). Comparing to results from the PM method, a higher rotation velocity ((232.5 +/- 0.83) km s(-1)) is derived at the position of the Sun in the 3DV method. The virial mass and local dark matter density are estimated from the 3DV method, which is the more reliable method, M-vir = (0.822 +/- 0.052) x 10(12) M-circle dot and rho(DM,circle dot) = 0.33 +/- 0.03 GeV, respectively. |
| WOS关键词 | TO-LIGHT RATIO ; RADIAL-VELOCITIES ; GALACTIC HALO ; RR LYRAE ; KINEMATICS ; GALAXY ; DISK ; DENSITY ; MODELS ; STARS |
| 资助项目 | National Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11890694] ; National Key R&D Program of China[2019YFA0405502] ; National Aeronautics and Space Administration ; National Development and Reform Commission |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000536868100001 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/54862]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Ablimit, Iminhaji |
| 作者单位 | 1.Kyoto Univ, Dept Astron, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan 2.Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ablimit, Iminhaji,Zhao, Gang,Flynn, Chris,et al. The Rotation Curve, Mass Distribution, and Dark Matter Content of the Milky Way from Classical Cepheids[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,895(1):8. |
| APA | Ablimit, Iminhaji,Zhao, Gang,Flynn, Chris,&Bird, Sarah A..(2020).The Rotation Curve, Mass Distribution, and Dark Matter Content of the Milky Way from Classical Cepheids.ASTROPHYSICAL JOURNAL LETTERS,895(1),8. |
| MLA | Ablimit, Iminhaji,et al."The Rotation Curve, Mass Distribution, and Dark Matter Content of the Milky Way from Classical Cepheids".ASTROPHYSICAL JOURNAL LETTERS 895.1(2020):8. |
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来源：国家天文台
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