X-ray Mass Estimates at $z\sim 0.3$ for the CNOC Cluster Sample

Abstract

Results are presented from the analysis of ROSAT HRI and PSPC observations of the CNOC subsample of the EMSS high redshift galaxy clusters. X-ray surface brightness profiles of 14 clusters with $0.17<z<0.55$ are constructed and fit to isothermal $\beta$ models. Where possible, we use both the HRI and PSPC data to constrain the fit. Under the assumptions of isothermality, hydrostatic equilibrium, and spherical symmetry, we derive total X-ray masses within a range of radii from 141 to $526h_{100}^{-1}$ kpc. These masses are compared with both the dynamical masses obtained from galaxy velocities and the projected masses from published gravitational lensing studies. We find no systematic bias between X-ray and dynamical methods across the sample, with an average $M_{Dyn}/M_X=1.04\pm 0.07$, although individual clusters exhibit mass discrepancies up to a factor of 2. We estimate that the systematic effects due to cooling flows, non-equilibrium systems and temperature gradients affect the average mass ratio by no more than $15-20$. Weak gravitational lensing masses appear to be systematically higher than X-ray results by factors of $\sim 50$, while strong lensing estimates show larger discrepancies (factors of $\sim 2.5$). However, these comparisons are complicated by the need to extrapolate the X-ray data to larger or smaller radii. X-ray derived cluster gas masses are calculated, from which we obtain a cluster baryon fraction of $\sim 5$, yielding ${\Omega }_0\sim 0.3h_{100}^{-1/2}$.

39 pages, AASTex 4.0, 11 figures, postscript. Accepted for publication in the Astrophysical Journal

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