The structure of galaxy clusters in different cosmologies

Details The structure of galaxy clusters in different cosmologies The structure of galaxy clusters in different cosmologies

1997-07-02

arxiv.org/abs/astro-ph/9707018v1

Astronomy and Astrophysics

Astrophysics

12 page file, MNRAS format including 15 eps figures. Also available from ftp://star.maps.susx.ac.uk/pub/papers/pat/clusters.ps

Scientific paper

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).

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