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题名: An improved model for the dynamical evolution of dark matter subhaloes
作者: Gan, JianLing1, 2, 3; Kang Xi(康熙)2, 4; van den Bosch, Frank C.5; Hou, JinLiang1
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2010-11-11
卷号: 408, 期号:4, 页码:2201-2212
关键词: methods: numerical ; galaxies: haloes ; galaxies: luminosity function, mass function ; dark matter
DOI: 10.1111/j.1365-2966.2010.17266.x
文章类型: Article
英文摘要: Using an analytical model, we study the evolution of subhalo, including its mass, angular momentum and merging time-scale. This model considers the dominant processes governing subhalo evolution, such as dynamical friction, tidal stripping and tidal heating. We find that in order to best match the evolution of angular momentum measured from N-body simulation, mass stripping by tidal force should become inefficient after subhalo has experienced a few passages of pericentre. It is also found that the often used Coulomb logarithm ln M/m has to be revised to best fit the merging time-scales from simulation. Combining the analytical model with the extended Press-Schechter (EPS) based merger trees, we study the subhalo mass function, and their spatial distribution in a Milky Way (MW) type halo. By tuning the tidal stripping efficiency, we can gain a better match to the subhalo mass function from simulation. The predicted distribution of subhaloes is found to agree with the distribution of MW satellites, but is more concentrated than the simulation results. The radial distribution of subhaloes depends weakly on subhaloes mass at both present day and the time of accretion, but strongly on the accretion time. Using the improved model, we measure the second moment of the subhalo occupation distribution, and it agrees well with the results of Kravtsov et al. and Zheng et al.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: MILKY-WAY SATELLITES ; HALO OCCUPATION DISTRIBUTION ; N-BODY SIMULATIONS ; GALAXY FORMATION ; RADIAL-DISTRIBUTION ; CLUSTER HALOES ; SPATIAL-DISTRIBUTION ; ORBITAL PARAMETERS ; SINKING SATELLITES ; DWARF SPHEROIDALS
收录类别: SCI
语种: 英语
WOS记录号: WOS:000283712700016
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15944
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.Max Planck Inst Astron, D-69117 Heidelberg, Germany
3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
4.Purple Mt Observ, Nanjing 210008, Peoples R China
5.Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA
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