The biggest splash
文献类型：期刊论文
| 作者 | Belokurov, Vasily2; Sanders, Jason L.2; Fattahi, Azadeh4; Smith, Martin C.5; Deason, Alis J.4; Evans, N. Wyn2; Grand, Robert J. J.1,3,6 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2020-05-01 |
| 卷号 | 494期号:3页码:3880-3898 |
| 关键词 | Galaxy: formation Galaxy: halo galaxies: dwarf Local Group |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/staa876 |
| 英文摘要 | Using a large sample of bright nearby stars with accurate Gala Data Release 2 astrometry and auxiliary spectroscopy we map out the properties of the principle Galactic components such as the 'thin' and 'thick' discs and the halo. We confirm previous claims that in the Solar neighbourhood, there exists a large population of metal-rich ([Fe/H] > -0.7) stars on highly eccentric orbits. By studying the evolution of elemental abundances, kinematics, and stellar ages in the plane of azimuthal velocity v(phi) and metallicity [Fe/H], we demonstrate that this metal-rich halo-like component, which we dub the Splash, is linked to the alpha-rich (or 'thick') disc. Splash stars have little to no angular momentum and many are on retrograde orbits. They are predominantly old, but not as old as the stars deposited into the Milky Way (MW) in the last major merger. We argue, in agreement with several recent studies, that the Splash stars may have been born in the MW's protodisc prior to the massive ancient accretion event which drastically altered their orbits. We cannot, however, rule out other (alternative) formation channels. 'raking advantage of the causal connection between the merger and the Splash, we put constraints of the epoch of the last massive accretion event to have finished 9.5 Gyr ago. The link between the local metal-rich and metal-poor retrograde stars is confirmed using a large suite of cutting-edge numerical simulations of the MW's formation. |
| WOS关键词 | PARSEC EVOLUTIONARY TRACKS ; MILKY-WAY ; STELLAR HALOES ; STAR-FORMATION ; GALACTIC HALO ; GAIA DR2 ; ACCRETION EVENTS ; ASSEMBLY HISTORY ; GALAXY FORMATION ; MASSIVE STARS |
| 资助项目 | Science & Technology Facilities Council (STFC) ; European Research Council (ERC) ; BIS National E-infrastructure capital grant[ST/K00042X/1] ; STFC[ST/H008519/1] ; STFC DiRAC Operations grant[ST/K003267/1] ; Durham University ; National Key Basic Research and Development Program of China[2018YFA0404501] ; NSFC[11673083] ; Royal Society University Research Fellowship ; European Union COFUND/Durham Junior Research Fellowship (under EU)[609412] ; Royal Society |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000535882100062 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | Science & Technology Facilities Council (STFC) ; Science & Technology Facilities Council (STFC) ; European Research Council (ERC) ; European Research Council (ERC) ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; STFC ; STFC ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; Durham University ; Durham University ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; European Union COFUND/Durham Junior Research Fellowship (under EU) ; European Union COFUND/Durham Junior Research Fellowship (under EU) ; Royal Society ; Royal Society ; Science & Technology Facilities Council (STFC) ; Science & Technology Facilities Council (STFC) ; European Research Council (ERC) ; European Research Council (ERC) ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; STFC ; STFC ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; Durham University ; Durham University ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; European Union COFUND/Durham Junior Research Fellowship (under EU) ; European Union COFUND/Durham Junior Research Fellowship (under EU) ; Royal Society ; Royal Society ; Science & Technology Facilities Council (STFC) ; Science & Technology Facilities Council (STFC) ; European Research Council (ERC) ; European Research Council (ERC) ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; STFC ; STFC ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; Durham University ; Durham University ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; European Union COFUND/Durham Junior Research Fellowship (under EU) ; European Union COFUND/Durham Junior Research Fellowship (under EU) ; Royal Society ; Royal Society ; Science & Technology Facilities Council (STFC) ; Science & Technology Facilities Council (STFC) ; European Research Council (ERC) ; European Research Council (ERC) ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; STFC ; STFC ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; Durham University ; Durham University ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; European Union COFUND/Durham Junior Research Fellowship (under EU) ; European Union COFUND/Durham Junior Research Fellowship (under EU) ; Royal Society ; Royal Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/54755]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Belokurov, Vasily |
| 作者单位 | 1.Heidelberg Univ, Astron Rech Inst, Zentrum Astron, Monchhofstr 12-14, D-69120 Heidelberg, Germany 2.Inst Astron, Madingley Rd, Cambridge CB3 0HA, England 3.Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany 4.Univ Durham, Inst Computat Cosmol, Dept Phys, South Rd, Durham DH1 3LE, England 5.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 6.Heidelberger Inst Theoret Studien, Schloss Wolfsbrunnenweg 35, D-69118 Heidelberg, Germany |
| 推荐引用方式 GB/T 7714 | Belokurov, Vasily,Sanders, Jason L.,Fattahi, Azadeh,et al. The biggest splash[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,494(3):3880-3898. |
| APA | Belokurov, Vasily.,Sanders, Jason L..,Fattahi, Azadeh.,Smith, Martin C..,Deason, Alis J..,...&Grand, Robert J. J..(2020).The biggest splash.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,494(3),3880-3898. |
| MLA | Belokurov, Vasily,et al."The biggest splash".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 494.3(2020):3880-3898. |
入库方式： OAI收割
来源：国家天文台
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