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B.R. McNamara, A. Vikhlinin (SAO), A. Hornstrup (DSRI), W Forman, C. Jones (SAO), H. Quintana (Pontificia Universidad Catolica)
We have measured galaxy surface density profiles and X-ray luminosities for 15, X-ray selected clusters with redshifts between z=0.5-0.7, and X-ray luminosities between Lx(0.5-2)=0.5-4.5x1044 erg s-1. The sample was selected from the CfA-Rosat survey of distant galaxy clusters (Vikhlinin et al. 1998). The cluster galaxy counts within 3h-1 Mpc, after correcting for incompleteness, range between ~20-100 cluster members within two magnitudes of the third brightest cluster galaxy. The counts are consistent with the sample being primarily Abell richness class 0 and 1 clusters. Two or three systems may be richness class 2 clusters, but only after large incompleteness corrections are applied. The Lx-Richness relation for our sample of distant clusters is similar to that for nearby clusters.