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题名: Semi-analytic model predictions of mass segregation from groups to clusters
作者: Contini, E.1; Kang Xi(康熙)1
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2015-10-11
卷号: 453, 期号:1, 页码:L53-L57
关键词: Galaxy: formation ; galaxies: evolution
学科分类: 天文和天体物理
DOI: 10.1093/mnrasl/slv103
文章类型: Article
英文摘要: Taking advantage of a high-resolution simulation coupled with a state-of-art semi-analytic model of galaxy formation, we probe the mass segregation of galaxies in groups and clusters, focusing on which physical mechanisms are driving it. We find evidence of mass segregation in groups and clusters up to the virial radius, both looking at the galaxy stellar mass and subhalo mass. The physical mechanism responsible for that is consistent with dynamical friction, a drag-force that brings more massive galaxies faster towards the innermost regions of the halo. At odds with observational results, we do not find the inclusion of low-mass galaxies in the samples, down to stellar mass M-* = 10(9) M-aS (TM), to change the overall trend shown by intermediate and massive galaxies. Moreover, stellar stripping as well as the growth of galaxies after their accretion, do not contribute either in shaping mass segregation or mixing the radial mass distribution. Beyond the virial radius we find an 'antimass segregation' in groups that progressively weakens in clusters. The continuous accretion of new objects and recent merger events play a different role depending on the halo mass on to which accreting material is falling.
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 ; DIGITAL SKY SURVEY ; GALAXY FORMATION MODELS ; STAR-FORMATION ; ENVIRONMENTAL DEPENDENCE ; COSMOLOGICAL SIMULATIONS ; INTRACLUSTER LIGHT ; DISC GALAXIES ; STELLAR MASS ; RESOLUTION
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000361300300012
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14858
Appears in Collections:星系宇宙学和暗能量研究团组_期刊论文

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作者单位: 1.MPI Astron, Purple Mt Observ, Partner Grp, Nanjing 210008, Jiangsu, Peoples R China
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