I study the evolution of haloes density profiles as a function of time in the SCDM and LCDM cosmologies. Following Del Popolo et al. (1999), I calculate the concentration parameter c=r_v/a and study its time evolution. For a given halo mass, I find that c(z) ~1/(1+z) both in the LCDM and SCDM cosmology, in agreement with Bullock et al. (1999) analytic model and N-body simulations. In both models, a(z) is roughly constant. The present model predicts a stronger evolution of c(z) with respect to Navarro et al. (1997) model. Finally I show some consequences of the result on galaxy modelling.
@article{arxiv.astro-ph/9908195,
title = {Profiles of dark-matter haloes at high redshift},
author = {A. Del Popolo},
journal= {arXiv preprint arXiv:astro-ph/9908195},
year = {2009}
}
Comments
14 pages, 3 encapsulated figures. Accepted by MNRAS