The structure of galaxy clusters in different cosmologies
Abstract
We investigate the internal structure of clusters of galaxies in high-resolution N-body simulations of 4 different cosmologies. There is a higher proportion of disordered clusters in critical-density than in low-density universes, although the structure of relaxed clusters is very similar in each. Crude measures of substructure, such as the shift in the position of the centre-of-mass as the density threshold is varied, can distinguish the two in a sample of just 20 or so clusters; it is harder to differentiate between clusters in open and flat models with the same density parameter. Most clusters are in a quasi-steady state within the virial radius and are well-described by the density profile of Navarro, Frenk & White (1995).
Cite
@article{arxiv.astro-ph/9707018,
title = {The structure of galaxy clusters in different cosmologies},
author = {Virgo Consortium and : and Peter A. Thomas and J. M. Colberg and H. M. P. Couchman and G. P. Efstathiou and C. S. Frenk and A. R. Jenkins and A. H. Nelson and R. M. Hutchings and J. A. Peacock and F. R. Pearce and S. D. M. White},
journal= {arXiv preprint arXiv:astro-ph/9707018},
year = {2012}
}
Comments
12 page file, MNRAS format including 15 eps figures. Also available from ftp://star.maps.susx.ac.uk/pub/papers/pat/clusters.ps.Z . Submitted to MNRAS