Velocity Dispersions of CNOC Clusters and the Evolution of the Cluster Abundance

Details Velocity Dispersions of CNOC Clusters and the Evolution of the Cluster Abundance Velocity Dispersions of CNOC Clusters and the Evolution of the Cluster Abundance

1999-07-23

arxiv.org/abs/astro-ph/9907323v2

Astronomy and Astrophysics

Astrophysics

11 pages, 8 figures, 1 table, LateX, uses apj.sty, ApJ, corrected some typos

Scientific paper

10.1086/308130

We present the results of the analysis of the internal velocity dispersions, \sigma_v, for the CNOC sample of distant galaxy clusters, based on an interlopers removal algorithm, which is different from that originally applied by Carlberg et al. (1996, C96). We find that the resulting \sigma_v values are consistent within <10% with the original C96 estimates. This result points in favor of a substantial robustness of currently applied methods for optical studies of the internal cluster dynamics. The resulting distribution of velocity dispersions is used to trace the redshift evolution of the cluster abundance with the aim of constraining the matter density parameter, \Omega_m. We find that constraints on \Omega_m are very sensitive to the adopted value of \sigma_8, as obtainable from the local cluster abundance: as \sigma_8 varies from 0.5 to 0.6 (for Omega_m=1), the best fitting Omega_m varies in the range 0.3-1.0.

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