The structure of galaxy clusters in various cosmologies

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

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.296.1061t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 296, Issue 4, pp. 1061-1071.

Astronomy and Astrophysics

Astronomy

125

Galaxies: Clusters: General, Cosmology: Miscellaneous

Scientific paper

We investigate the internal structure of clusters of galaxies in high-resolution N-body simulations of four 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 case. 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.

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