PANORAMIC VIEWS OF GALAXY CLUSTER EVOLUTION: GALAXY ECOLOGY

Redshift Evolution of Galaxy Cluster

The number of rich galaxy clusters per unit volume is a strong function of , the cosmological density parameter, and 8 , the linear extrapolation to z = 0 of the density contrast in 8h ?1 Mpc spheres. The CNOC cluster redshift survey provides a sample of clusters whose average mass prooles are accurately known, which enables a secure association between cluster numbers and the ltered density pe...

The Interplay of Cluster and Galaxy Evolution

We review here the interplay of cluster and galaxy evolution. As a case study, we consider the Butcher–Oemler effect and propose that it is the result of the changing rate of cluster merger events in a hierarchical universe. This case study highlights the need for new catalogs of clusters and groups that possess quantified morphologies. We present such a sample here, namely the Sloan Digital Sk...

Redshift Evolution of Galaxy Cluster Densities

The number of rich galaxy clusters per unit volume is a strong function of V, the cosmological density parameter, and s8, the linear extrapolation to z 5 0 of the density contrast in 8 h Mpc spheres. The Canadian Network for Observational Cosmology (CNOC) cluster redshift survey provides a sample of clusters, the average mass profiles of which are accurately known, which enables a secure associ...

Galaxy Cluster Abundance Evolution and Cosmological Parameters

We use the observed evolution of the galaxy cluster X-ray integral temperature distribution function between z = 0.05 and z = 0.32 in an attempt to constrain the value of the density parameter, Ω0, for both open and spatially-flat universes. We conclude that when all the most important sources of possible error, both in the observational data and in the theoretical modelling, are taken into acc...

Galaxy Evolution