期刊
ASTROPHYSICAL JOURNAL
卷 741, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/741/1/13
关键词
dark matter; galaxies: formation; galaxies: halos
资金
- 973 Program [2007CB815402]
- CAS [KJCX2-YW-T05, KJCX2-YW-T23]
- NSFC [10821302, 10925314]
- NSF [AST-0908334]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [908334] Funding Source: National Science Foundation
An analytical model is developed for the mass function of cold dark matter subhalos at the time of accretion and for the distribution of their accretion times. Our model is based on the model of Zhao et al. for the median assembly histories of dark matter halos, combined with a simple log-normal distribution to describe the scatter in the main-branch mass at a given time for halos of the same final mass. Our model is simple, and can be used to predict the un-evolved subhalo mass function, the mass function of subhalos accreted at a given time, the accretion-time distribution of subhalos of a given initial mass, and the frequency of major mergers as a function of time. We test our model using high-resolution cosmological N-body simulations and find that our model predictions match the simulation results remarkably well. Finally, we discuss the implications of our model for the evolution of subhalos in their hosts and for the construction of a self-consistent model to link galaxies and dark matter halos at different cosmic times.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据