Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-04-10
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
14 pages, 10 figures (caption for figure 10 fixed). Accepted for publication in ApJ
Scientific paper
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. (2009) 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.
Mo Hou-Jun
van den Bosch Frank C.
Yang Xiaohu
Zhang Youcai
No associations
LandOfFree
An analytical model for the accretion of dark matter subhalos does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An analytical model for the accretion of dark matter subhalos, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An analytical model for the accretion of dark matter subhalos will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-316310