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题名: Modeling the dynamical friction timescale of a sinking satellite
作者: Gan, Jian-Ling1, 3; Kang Xi(康熙)2; Hou, Jin-Liang1; Chang, Rui-Xiang1
刊名: RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期: 2010-12-01
卷号: 10, 期号:12, 页码:1242-1254
关键词: methods analytical ; methods numerical ; galaxies haloes ; galaxies evolution ; galaxies interactions ; cosmology dark matter
文章类型: Article
英文摘要: When a satellite galaxy falls into a massive dark matter halo it suffers from the dynamical friction force which drags it into the halo's center, where it finally merges with the central galaxy The time interval between entry and merger is called the dynamical friction timescale (T-df) Many studies have been dedicated to deriving T-df using analytical models or N-body simulations These studies have obtained qualitative agreements on how T-df depends on the orbital parameters, and the mass ratio between the satellite and the host's halo However, there are still disagreements on deriving an accurate form for T-df We present a semi-analytical model to predict T-df and we focus on interpreting the discrepancies among different studies We find that the treatment of mass loss from the satellite by tidal stripping dominates the behavior of T-df We also identify other model parameters which affect the predicted T-df
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 SUBSTRUCTURE ; GALAXY FORMATION ; DENSITY PROFILES ; INNER STRUCTURE ; POWER SPECTRUM ; GALACTIC DISCS ; DWARF GALAXIES ; MASS-LOSS ; HALOES ; EVOLUTION
收录类别: SCI
语种: 英语
WOS记录号: WOS:000285676800005
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15948
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
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