Multiwavelength mass comparisons of the z ∼ 0.3 CNOC cluster sample

Results are presented from a detailed analysis of optical and X- ray observations of moderate- redshift galaxy clusters from the Canadian Network for Observational Cosmology ( CNOC) subsample of the EMSS. The combination of extensive optical and deep X- ray observations of these clusters make them ideal candidates for multiwavelength mass comparison studies. X- ray surface brightness profiles of 14 clusters with 0: 17 < z < 0: 55 are constructed from Chandra observations and fit to single- and double-beta models. Spatially resolved temperature analysis is performed, indicating that five of the clusters in this sample exhibit temperature gradients within their inner 60-200 kpc. Integrated spectra extracted within R-2500 provide temperature, abundance, and luminosity information. Under assumptions of hydrostatic equilibrium and spherical symmetry, we derive gas and totalmasses within R-2500 and R-200. We find an average gas mass fraction of f(gas)(R-200) 0:092 +/- 0:004 h(70)(-3/2), resulting in Omega(m) 0:42 +/- 0:02 ( formal error). We also derive dynamical masses for these clusters to R200. We find no systematic bias between X- ray and dynamical methods across the sample, with an average Mdyn/MX 0:97 +/- 0:05. We also compare X- ray masses to weaklensing mass estimates of a subset of our sample, resulting in a weighted average of M-dyn/M-X of 0:99 +/- 0: 07. We investigate X-ray- scaling relationships and find power- law slopes that are slightly steeper than the predictions of self-similar models, with an E(z)(-1) L-X-T-X slope of 2:4 +/- 0:2 and an E(z) M-2500- T-X slope of 1:7 +/- 0:1. Relationships between red- sequence optical richness ( B-gc,B- red) and global cluster X- ray properties (T-X, L-X, and M-2500) are also examined and fitted.