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A 2-3 billion year old major merger paradigm for the Andromeda galaxy and its outskirts
Hammer, F.1; Yang, Y. B.1; Wang, J. L.1,2; Ibata, R.3; Flores, H.1; Puech, M.1
2018-04-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume475Issue:2Pages:2754-2767
AbstractRecent 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.
Keywordgalaxies: formation galaxies: haloes galaxies: individual: M31 galaxies: kinematics and dynamics Local Group
Funding OrganizationRegion 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
DOI10.1093/mnras/stx3343
WOS KeywordSTAR-FORMATION HISTORY ; GIANT SOUTHERN STREAM ; DWARF GALAXIES ; MILKY-WAY ; COSMOLOGICAL SIMULATIONS ; TIDAL STREAMS ; OUTER DISC ; LAMBDA-CDM ; THIN PLANE ; M31
Language英语
Funding ProjectRegion 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]
Funding OrganizationRegion 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
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000427345900092
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/37267
Collection中国科学院国家天文台
Corresponding AuthorHammer, F.; Yang, Y. B.; Ibata, R.
Affiliation1.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
Recommended Citation
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.
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