Diagonal Ridge Pattern of Different Age Populations Found in Gaia-DR2 with LAMOST Main-sequence Turnoff and OB-type Stars
文献类型：期刊论文
| 作者 | Wang,H.-F.4; Huang,Y.4; Zhang,H.-W.5,8; López-Corredoira,M.1,6; Cui,W.-Y.7; Chen,B.-Q.4; Guo,R.2; Chang,J.3 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-10-01 |
| 卷号 | 902期号:1 |
| 关键词 | Milky Way disk Milky Way dynamics Milky Way evolution Milky Way formation the Milky Way |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/abb3c8 |
| 英文摘要 | Abstract We revisit the diagonal ridge feature (diagonal distributions in the R, v? plane) found in Gaia and present a timing analysis for it between Galactocentric distances of R?=?7.5 and 12 kpc, using main-sequence turnoff and OB stars selected from the LAMOST Galactic spectroscopic surveys. We recover the ridge pattern in the R–v? plane color coded by mean radial velocity and find that this feature is presented from very young (OB stars, few hundred megayears) to very old populations (τ?=?9–14 Gyr). Meanwhile, some ridge features are also revealed in the metallicity [Fe/H], [α/Fe], and vz distributions. In the LZ, v? plane, one of the ridge patterns, with constant angular momentum per unit mass, shows variations with different age populations compared. However, the remaining two are relatively stable, implying there might be two kinds of ridge patterns with different dynamical origins and evolutions. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-902-1-ABB3C8 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/62026]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Wang,H.-F. |
| 作者单位 | 1.Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain 2.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China 3.Purple Mountain Observatory, the Partner Group of MPI für Astronomie, 2 West Beijing Road, Nanjing 210008, 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, yanghuang@ynu.edu.cn 5.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China 6.Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain 7.Department of Physics, Hebei Normal University, Shijiazhuang 050024, People’s Republic of China 8.Department of Astronomy, Peking University, Beijing 100871, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Wang,H.-F.,Huang,Y.,Zhang,H.-W.,et al. Diagonal Ridge Pattern of Different Age Populations Found in Gaia-DR2 with LAMOST Main-sequence Turnoff and OB-type Stars[J]. The Astrophysical Journal,2020,902(1). |
| APA | Wang,H.-F..,Huang,Y..,Zhang,H.-W..,López-Corredoira,M..,Cui,W.-Y..,...&Chang,J..(2020).Diagonal Ridge Pattern of Different Age Populations Found in Gaia-DR2 with LAMOST Main-sequence Turnoff and OB-type Stars.The Astrophysical Journal,902(1). |
| MLA | Wang,H.-F.,et al."Diagonal Ridge Pattern of Different Age Populations Found in Gaia-DR2 with LAMOST Main-sequence Turnoff and OB-type Stars".The Astrophysical Journal 902.1(2020). |
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