A chronicle of galaxy mass assembly in the EAGLE simulation
文献类型：期刊论文
| 作者 | Qu, Yan1; Helly, John C.2; Bower, Richard G.2; Theuns, Tom2; Crain, Robert A.3; Frenk, Carlos S.2; Furlong, Michelle2; McAlpine, Stuart2; Schaller, Matthieu2; Schaye, Joop4 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2017 |
| 卷号 | 464期号:2页码:1659-1675 |
| 关键词 | galaxies: evolution galaxies: formation galaxies: high-redshift galaxies: interactions galaxies: stellar content |
| 英文摘要 | We analyse the mass assembly of central galaxies in the Evolution and Assembly of Galaxies and their Environments (EAGLE) hydrodynamical simulations. We build merger trees to connect galaxies to their progenitors at different redshifts and characterize their assembly histories by focusing on the time when half of the galaxy stellar mass was assembled into the main progenitor. We show that galaxies with stellar mass M-* < 10(10.5) M-circle dot assemble most of their stellar mass through star formation in the main progenitor ('in situ' star formation). This can be understood as a consequence of the steep rise in star formation efficiency with halo mass for these galaxies. For more massive galaxies, however, an increasing fraction of their stellar mass is formed outside the main progenitor and subsequently accreted. Consequently, while for low-mass galaxies, the assembly time is close to the stellar formation time, the stars in high-mass galaxies typically formed long before half of the present-day stellar mass was assembled into a single object, giving rise to the observed antihierarchical downsizing trend. In a typical present-day M-* >= 10(11) M-circle dot galaxy, around 20 per cent of the stellar mass has an external origin. This fraction decreases with increasing redshift. Bearing in mind that mergers only make an important contribution to the stellar mass growth of massive galaxies, we find that the dominant contribution comes from mergers with galaxies of mass greater than one-tenth of the main progenitor's mass. The galaxy merger fraction derived from our simulations agrees with recent observational estimates. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DARK-MATTER HALOES ; LAMBDA-CDM COSMOLOGY ; STAR-FORMATION HISTORIES ; MAJOR MERGER RATE ; HIERARCHICAL UNIVERSE ; STELLAR MASS ; ILLUSTRIS SIMULATION ; DISTANT GALAXIES ; FORMATION MODELS ; MERGING HISTORY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000393647100029 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8276]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 10012, Peoples R China 2.Univ Durham, Inst Computat Cosmol, South Rd, Durham DH1 3LE, England 3.Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England 4.Leiden Univ, Leiden Observ, Postbus 9513, NL-2300 RA Leiden, Netherlands 5.Max Planck Inst Astrophys, Karl Schwarzschild Strae 1, D-85741 Garching, Germany |
| 推荐引用方式 GB/T 7714 | Qu, Yan,Helly, John C.,Bower, Richard G.,et al. A chronicle of galaxy mass assembly in the EAGLE simulation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,464(2):1659-1675. |
| APA | Qu, Yan.,Helly, John C..,Bower, Richard G..,Theuns, Tom.,Crain, Robert A..,...&White, Simon D. M..(2017).A chronicle of galaxy mass assembly in the EAGLE simulation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,464(2),1659-1675. |
| MLA | Qu, Yan,et al."A chronicle of galaxy mass assembly in the EAGLE simulation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 464.2(2017):1659-1675. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。