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26 April 2024 |
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A Richness Study of 14 Distant X-ray Clusters From the 160 Square Degree Survey | | B.R. McNamara
; A. Vikhlinin
; A. Hornstrup
; H. Quintana
; K. Whitman
; W. Forman
; & C. Jones
; | | Date: |
14 May 2001 | | Subject: | astro-ph | | Affiliation: | Ohio U.), A. Vikhlinin (IKI & CfA), A. Hornstrup (DSRI), H. Quintana (Catolica), K. Whitman (Cornell), W. Forman (CfA), & C. Jones (CfA | | Abstract: | We have measured the surface density of galaxies toward 14 X-ray-selected cluster candidates at redshifts greater than z=0.46, and we show that they are associated with rich galaxy concentrations. We find that the clusters range between Abell richness classes 0-2, and have a most probable richness class of one. We compare the richness distribution of our distant clusters to those for three samples of nearby clusters with similar X-ray luminosities. We find that the nearby and distant samples have similar richness distributions, which shows that clusters have apparently not evolved substantially in richness since redshift z =0.5. We compare the distribution of distant X-ray clusters in the L_x--richness plane to the distribution of optically-selected clusters from the Palomar Distant Cluster Survey. The optically-selected clusters appear overly rich for their X-ray luminosities when compared to X-ray-selected clusters. Apparently, X-ray and optical surveys do not necessarily sample identical mass concentrations at large redshifts. This may indicate the existence of a population of optically rich clusters with anomalously low X-ray emission. More likely, however, it reflects the tendency for optical surveys to select unvirialized mass concentrations, as might be expected when peering along large-scale filaments. | | Source: | arXiv, astro-ph/0105224 | | Services: | Forum | Review | PDF | Favorites | |
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