Common origin for Hercules-Aquila and Virgo Clouds in Gaia DR2
文献类型：期刊论文
| 作者 | Simion, Iulia T.1; Belokurov, Vasily2,3; Koposov, Sergey E.2,4 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2019 |
| 卷号 | 482期号:1页码:921-928 |
| ISSN号 | 0035-8711 |
| 关键词 | Galaxy: formation Galaxy: structure galaxies: individual: Milky Way |
| DOI | 10.1093/mnras/sty2744 |
| 英文摘要 | We use a sample of similar to 350 RR Lyrae stars with radial velocities and Gaia Data Release 2 proper motions to study orbital properties of the Hercules-Aquila Cloud (HAC) and Virgo Over-density (VOD). We demonstrate that both structures are dominated by stars on highly eccentric orbits, with pericentres around similar to 1 kpc and apocentres at 15-25 kpc from the Galactic Centre. Given that the stars in the HAC and the VOD occupy very similar regions in the space spanned by integrals of motion, we conclude that these diffuse debris clouds are part of the same accretion event. More precisely, they likely represent two complementary not-fully mixed portions of an ancient massive merger, which has reshaped our Galaxy. |
| 资助项目 | European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013), ERC[308024] ; PIFI[2018PM0050] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000454575300063 |
| 源URL | [http://119.78.226.72/handle/331011/32025]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Simion, Iulia T. |
| 作者单位 | 1.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Inst Astron, Madingley Rd, Cambridge CB3 0HA, England 3.Flatiron Inst, Ctr Computat Astrophys, 162 5th Ave, New York, NY 10010 USA 4.Carnegie Mellon Univ, Dept Phys, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA |
| 推荐引用方式 GB/T 7714 | Simion, Iulia T.,Belokurov, Vasily,Koposov, Sergey E.. Common origin for Hercules-Aquila and Virgo Clouds in Gaia DR2[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,482(1):921-928. |
| APA | Simion, Iulia T.,Belokurov, Vasily,&Koposov, Sergey E..(2019).Common origin for Hercules-Aquila and Virgo Clouds in Gaia DR2.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,482(1),921-928. |
| MLA | Simion, Iulia T.,et al."Common origin for Hercules-Aquila and Virgo Clouds in Gaia DR2".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 482.1(2019):921-928. |
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来源：上海天文台
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