The evolution of groups and clusters
Astrophysics
2007-05-23 v1
Abstract
Using high resolution N-body simulations we have studied the formation and evolution of clusters and groups in a LCDM cosmological model. Groups of galaxies have been formed already before z=4. The total number of small bound systems and the total number of galaxies in these small systems rapidly decreases after z=1.5. The fraction of isolated galaxies remains approximately constant after z =1, whereas the fraction of galaxies in groups decreases. Merging of groups and accretion leads to cluster formation at z < 2. Some of the groups merge into large isolated halos.
Cite
@article{arxiv.astro-ph/9909185,
title = {The evolution of groups and clusters},
author = {S. Gottloeber and A. Klypin and A. V. Kravtsov and V. Turchaninov},
journal= {arXiv preprint arXiv:astro-ph/9909185},
year = {2007}
}
Comments
6 pages, 3 figures, Contribution to the IAU Colloquium 174 on "Small Galaxy Groups" Turku, Finland, June 1999