The evolution of groups and clusters

Details The evolution of groups and clusters The evolution of groups and clusters

1999-09-10

arxiv.org/abs/astro-ph/9909185v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, Contribution to the IAU Colloquium 174 on "Small Galaxy Groups" Turku, Finland, June 1999

Scientific paper

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.

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