Journal
ASTROPHYSICAL JOURNAL
Volume 741, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/741/1/13
Keywords
dark matter; galaxies: formation; galaxies: halos
Categories
Funding
- 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
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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.
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