The age-velocity dispersion relation of the Galactic discs from LAMOST-Gaia data
文献类型：期刊论文
| 作者 | Yu, Jincheng; Liu, Chao
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2018-03-01 |
| 卷号 | 475期号:1页码:1093-1103 |
| 关键词 | Galaxy: disc Galaxy: evolution Galaxy: kinematics and dynamics solar neighbourhood |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/stx3204 |
| 英文摘要 | We present the age-velocity dispersion relation (AVR) in three dimensions in the solar neighbourhood using 3564 commonly observed sub-giant/red giant branch stars selected from The Large Sky Area Multi-Object Fiber Spectroscopic Telescope, which gives the age and radial velocity, and Gaia, which measures the distance and proper motion. The stars are separated into metal-poor ([Fe/H] < -0.2 dex and metal-rich ([Fe/H] > -0.2 dex) groups, so that the metal-rich stars are mostly alpha-poor, while the metal-poor group are mostly contributed by a-enhanced stars. Thus, the old and metal-poor stars likely belong to the chemically defined thick disc population, while the metal-rich sample is dominated by the thin disc. The AVR for the metal-poor sample shows an abrupt increase at greater than or similar to 7 Gyr, which is contributed by the thick disc component. On the other hand, most of the thin disc stars with [Fe/H] > -0.2 dex display a power-law-like AVR with indices of about 0.3-0.4 and 0.5 for the in-plane and vertical dispersions, respectively. This is consistent with the scenario that the disc is gradually heated by the spiral arms and/or the giant molecular clouds. Moreover, the older thin disc stars (> 7 Gyr) have a rounder velocity ellipsoid, i.e. sigma(phi)/sigma(z), is close to 1.0, probably due to the more efficient heating in vertical direction. Particularly for the old metal-poor sample located with vertical bar z vertical bar > 270 pc, the vertical dispersion is even larger than its azimuthal counterpart. Finally, the vertex deviations and the tilt angles are plausibly around zero with large uncertainties. |
| WOS关键词 | MILKY-WAY DISC ; GENEVA-COPENHAGEN SURVEY ; RADIAL MIGRATION ; DYNAMICAL EVOLUTION ; SOLAR NEIGHBORHOOD ; CHEMICAL EVOLUTION ; TELESCOPE LAMOST ; SPIRAL GALAXIES ; THICK DISCS ; KINEMATICS |
| 资助项目 | National Key Basic Research Program of China[2014CB845700] ; National Natural Science Foundation of China (NSFC)[11373032] ; National Natural Science Foundation of China (NSFC)[11333003] ; National Development and Reform Commission |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000427144200084 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/37150]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Yu, Jincheng; Liu, Chao |
| 作者单位 | Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Jincheng,Liu, Chao. The age-velocity dispersion relation of the Galactic discs from LAMOST-Gaia data[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,475(1):1093-1103. |
| APA | Yu, Jincheng,&Liu, Chao.(2018).The age-velocity dispersion relation of the Galactic discs from LAMOST-Gaia data.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,475(1),1093-1103. |
| MLA | Yu, Jincheng,et al."The age-velocity dispersion relation of the Galactic discs from LAMOST-Gaia data".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 475.1(2018):1093-1103. |
入库方式： OAI收割
来源：国家天文台
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