Abundance of Rich Clusters of Galaxies: A Test for Cosmological Parameters
Abstract
The Press-Schechter formalism for deriving distribution functions for mass and X-ray temperature (or velocity dispersion) of rich clusters of galaxies in hierarchical clustering scenarios is extended to general cosmologies with arbitrary values of cosmological density parameter and cosmological constant. These distribution functions are shown to provide important diagnostics for both the fluctuation spectrum and for the fundamental cosmological parameters. The distribution functions for low- density CDM models fall less steeply off at the high end compared with the "standard" CDM model. This brings them closer to the observational results. However, CDM models with {OMEGA}_0_=0.2 and H_0_=100 km s^-1^Mpc^-1^ might need an antibias of the galaxy fluctuations relative to the mass fluctuations to reproduce the X- ray temperature function of Henry & Arnaud in the 3-10 keV range.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1992
- DOI:
- 10.1086/186286
- Bibcode:
- 1992ApJ...386L..33L
- Keywords:
-
- Abundance;
- Computational Astrophysics;
- Galactic Clusters;
- Mass Distribution;
- Astronomical Models;
- Cosmology;
- Dark Matter;
- Distribution Functions;
- X Ray Spectra;
- Astrophysics;
- COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE;
- GALAXIES: CLUSTERING;
- X-RAYS: GALAXIES