A 2-3 billion year old major merger paradigm for the Andromeda galaxy and its outskirts
文献类型：期刊论文
| 作者 | Hammer, F.1; Yang, Y. B.1; Wang, J. L.1,2; Ibata, R.3; Flores, H.1; Puech, M.1 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2018-04-01 |
| 卷号 | 475期号:2页码:2754-2767 |
| 关键词 | galaxies: formation galaxies: haloes galaxies: individual: M31 galaxies: kinematics and dynamics Local Group |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/stx3343 |
| 英文摘要 | Recent observations of our neighbouring galaxy M31 have revealed that its disc was shaped by widespread events. The evidence for this includes the high dispersion (V/sigma <= 3) of stars older than 2 Gyr, and a global star formation episode, 2-4 Gyr ago. Using the modern hydrodynamical code, GIZMO, we have performed 300 high-resolution simulations to explore the extent to which these observed properties can be explained by a single merger. We find that the observed M31 disc resembles models having experienced a 4:1 merger, in which the nuclei coalesced 1.8-3 Gyr ago, and where the first passage took place 7-10 Gyr ago at a large pericentre distance (32 kpc). We also show that within a family of orbital parameters, the Giant Stream (GS) can be formed with various merger mass ratios, from 2:1 to 300:1. A recent major merger may be the only way to create the very unusual age-dispersion relation in the disc. It reproduces and explains the long-lived 10 kpc ring, the widespread and recent star formation event, the absence of a remnant of the GS progenitor, the apparent complexity of the 3D spatial distribution of the GS, the NE and G Clumps and their formation process, and the observed slope of the halo profile. These modelling successes lead us to propose that the bulk of the substructure in the M31 halo, as well as the complexity of the inner galaxy, may be attributable to a single major interaction with a galaxy that has now fully coalesced with Andromeda. |
| WOS关键词 | STAR-FORMATION HISTORY ; GIANT SOUTHERN STREAM ; DWARF GALAXIES ; MILKY-WAY ; COSMOLOGICAL SIMULATIONS ; TIDAL STREAMS ; OUTER DISC ; LAMBDA-CDM ; THIN PLANE ; M31 |
| 资助项目 | Region Ile de France ; project Equip@Meso of the program 'Investissements d Avenir[ANR-10-EQPX-29-01] ; China-France International Associated Laboratory 'Origins' ; China Scholarship Council[201604910336] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000427345900092 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | Region Ile de France ; Region Ile de France ; project Equip@Meso of the program 'Investissements d Avenir ; project Equip@Meso of the program 'Investissements d Avenir ; China-France International Associated Laboratory 'Origins' ; China-France International Associated Laboratory 'Origins' ; China Scholarship Council ; China Scholarship Council ; Region Ile de France ; Region Ile de France ; project Equip@Meso of the program 'Investissements d Avenir ; project Equip@Meso of the program 'Investissements d Avenir ; China-France International Associated Laboratory 'Origins' ; China-France International Associated Laboratory 'Origins' ; China Scholarship Council ; China Scholarship Council ; Region Ile de France ; Region Ile de France ; project Equip@Meso of the program 'Investissements d Avenir ; project Equip@Meso of the program 'Investissements d Avenir ; China-France International Associated Laboratory 'Origins' ; China-France International Associated Laboratory 'Origins' ; China Scholarship Council ; China Scholarship Council ; Region Ile de France ; Region Ile de France ; project Equip@Meso of the program 'Investissements d Avenir ; project Equip@Meso of the program 'Investissements d Avenir ; China-France International Associated Laboratory 'Origins' ; China-France International Associated Laboratory 'Origins' ; China Scholarship Council ; China Scholarship Council |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/37266]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Hammer, F.; Yang, Y. B.; Ibata, R. |
| 作者单位 | 1.PSL Res Univ, CNRS, Observ Paris, GEPI, Pl Jules Janssen, F-92190 Meudon, France 2.Chinese Acad Sci, NAOC, A20 Datun Rd, Beijing 100012, Peoples R China 3.Univ Strasbourg, CNRS, Observ Astron, 11 Rue Univ, F-67000 Strasbourg, France |
| 推荐引用方式 GB/T 7714 | Hammer, F.,Yang, Y. B.,Wang, J. L.,et al. A 2-3 billion year old major merger paradigm for the Andromeda galaxy and its outskirts[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,475(2):2754-2767. |
| APA | Hammer, F.,Yang, Y. B.,Wang, J. L.,Ibata, R.,Flores, H.,&Puech, M..(2018).A 2-3 billion year old major merger paradigm for the Andromeda galaxy and its outskirts.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,475(2),2754-2767. |
| MLA | Hammer, F.,et al."A 2-3 billion year old major merger paradigm for the Andromeda galaxy and its outskirts".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 475.2(2018):2754-2767. |
入库方式： OAI收割
来源：国家天文台
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