On the Kinematic Signature of the Galactic Warp As Revealed By the LAMOST-TGAS Data
文献类型：期刊论文
| 作者 | Huang, Y.1,2; Schonrich, R.3; Liu, X. -W.1; Chen, B. -Q.1; Zhang, H. -W.2,4; Yuan, H. -B.5; Xiang, M. -S.6; Wang, C.2; Tian, Z. -J.2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018-09-10 |
| 卷号 | 864期号:2页码:7 |
| 关键词 | Galaxy: kinematics and dynamics Galaxy: structure solar neighborhood stars: distances stars: kinematics and dynamics |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aad285 |
| 英文摘要 | Using a sample of about 123,000 stars with accurate 3D velocity measurements from the LAMOST-TGAS data, we confirm the kinematic signature of the Galactic warp recently found by Schonrich & Dehnen. The data reveal a clear trend of increasing mean vertical velocity (V-z) over bar as a function of absolute vertical angular momentum L-z and azimuthal velocity V-phi for guiding center radius R-g between 6.0 and 10.5 kpc. The trend is consistent with a large-scale Galactic warp. Similar to Schonrich & Dehnen, we also find a wave-like pattern of (V-z) over bar versus L-z with an amplitude of similar to 0.9 km s(-1) on a scale of similar to 2.0 kpc, which could arise from bending waves or a winding warp. Finally, we confirm a prominent, localized peak in (V-z) over bar near L-z similar to 2150 kpc km s(-1) (corresponding to R-g similar to 9 kpc and V-phi similar to 255 km s(-1)). The additional line-of-sight velocity information from LAMOST reveals that stars in this feature have a large, inward radial velocity of V-R similar to -13.33 +/- 0.59 km s(-1) and a small radial velocity dispersion of sigma(R)similar to 25.27 +/- 0.89 km s(-1), suggesting that a stellar stream gives rise to this feature. |
| WOS关键词 | MILKY-WAY ; SPIRAL GALAXIES ; LOCAL STANDARD ; STARS ; DISKS ; MASS ; HIPPARCOS ; ROTATION ; REGIONS ; ORIGIN |
| 资助项目 | National Development and Reform Commission ; Special fund for Advanced Users ; Royal Society University Research Fellowship ; National Key Basic Research Program of China[2014CB845700] ; China Postdoctoral Science Foundation[2016M600849] ; National Natural Science Foundation of China[U1531244] ; National Natural Science Foundation of China[11473001] ; National Natural Science Foundation of China[11811530289] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000444073900005 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | National Development and Reform Commission ; National Development and Reform Commission ; Special fund for Advanced Users ; Special fund for Advanced Users ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; Special fund for Advanced Users ; Special fund for Advanced Users ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; Special fund for Advanced Users ; Special fund for Advanced Users ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; Special fund for Advanced Users ; Special fund for Advanced Users ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/23161]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Huang, Y. |
| 作者单位 | 1.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China 2.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 3.Rudolf Peierls Ctr Theoret Phys, 1 Keble Rd, Oxford OX1 3NP, England 4.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 5.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 6.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, Y.,Schonrich, R.,Liu, X. -W.,et al. On the Kinematic Signature of the Galactic Warp As Revealed By the LAMOST-TGAS Data[J]. ASTROPHYSICAL JOURNAL,2018,864(2):7. |
| APA | Huang, Y..,Schonrich, R..,Liu, X. -W..,Chen, B. -Q..,Zhang, H. -W..,...&Tian, Z. -J..(2018).On the Kinematic Signature of the Galactic Warp As Revealed By the LAMOST-TGAS Data.ASTROPHYSICAL JOURNAL,864(2),7. |
| MLA | Huang, Y.,et al."On the Kinematic Signature of the Galactic Warp As Revealed By the LAMOST-TGAS Data".ASTROPHYSICAL JOURNAL 864.2(2018):7. |
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来源：国家天文台
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