Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VI. Evidence for the Long-lived Nonsteady Warp of Nongravitational Scenarios
文献类型：期刊论文
| 作者 | Wang,H.-F.4; López-Corredoira,M.1,9; Huang,Y.4; Chang,J.2; Zhang,H.-W.3,8; Carlin,J. L.5; Chen,X.-D.6,7; Chrobáková,?.1,9; Chen,B.-Q.4 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-07-01 |
| 卷号 | 897期号:2 |
| 关键词 | Milky Way disk Milky Way dynamics Milky Way Galaxy |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab93ad |
| 英文摘要 | Abstract By combining LAMOST DR4 and Gaia DR2 common red clump stars with age and proper motion, we analyze the amplitude evolution of the stellar warp independently of any assumption with a simple model. The greatest height of the warp disk increases with galactocentric distance in different populations and is dependent on age: the younger stellar populations exhibit stronger warp features than the old ones, accompanied by the warp amplitude γ (age) decreasing with age, and its first derivative is different from zero. The azimuth of the line of nodes ?w is stable at ?5° without clear time evolution, which perfectly confirms some previous works. All of this self-consistent evidence supports that our Galactic warp should most likely be a long-lived but nonsteady structure and not a transient one, which is supporting that the warp originated from gas infall onto the disk or other hypotheses that suppose that the warp mainly affects the gas, and consequently, younger populations tracing the gas are stronger than older ones. In other words, the Galactic warp is induced by the nongravitational interaction over the disk models. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-897-2-AB93AD |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/63121]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain 2.Purple Mountain Observatory, the Partner Group of MPI für Astronomie, 2 West Beijing Road, Nanjing 210008, People’s Republic of China 3.Department of Astronomy, Peking University, Beijing 100871, People’s Republic of China 4.South-Western Institute for Astronomy Research, Yunnan University, Kunming, 650500, People’s Republic of China; hfwang@bao.ac.cn 5.LSST, 950 North Cherry Avenue, Tucson, AZ 85719, USA 6.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China 7.Department of Astronomy, China West Normal University, Nanchong 637009, People’s Republic of China 8.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China 9.Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain |
| 推荐引用方式 GB/T 7714 | Wang,H.-F.,López-Corredoira,M.,Huang,Y.,et al. Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VI. Evidence for the Long-lived Nonsteady Warp of Nongravitational Scenarios[J]. The Astrophysical Journal,2020,897(2). |
| APA | Wang,H.-F..,López-Corredoira,M..,Huang,Y..,Chang,J..,Zhang,H.-W..,...&Chen,B.-Q..(2020).Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VI. Evidence for the Long-lived Nonsteady Warp of Nongravitational Scenarios.The Astrophysical Journal,897(2). |
| MLA | Wang,H.-F.,et al."Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VI. Evidence for the Long-lived Nonsteady Warp of Nongravitational Scenarios".The Astrophysical Journal 897.2(2020). |
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来源：国家天文台
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