Astrophys. J., 652, 232-248 (2006/November-3)
Multiwavelength mass comparisons of the z∼0.3 CNOC cluster sample.
HICKS A.K., ELLINGSON E., HOEKSTRA H. and YEE H.K.C.
Abstract (from CDS):
Result. 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-β 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 R2500provide temperature, abundance, and luminosity information. Under assumptions of hydrostatic equilibrium and spherical symmetry, we derive gas and total masses within R2500 and R200. We find an average gas mass fraction of fgas(R200)=0.092±0.004 h–3/270, resulting in Ωm=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 weak-lensing mass estimates of a subset of our sample, resulting in a weighted average of Mlens/MX 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)–1LX-TXslope of 2.4±0.2 and an E(z)M2500-TXslope of 1.7±0.1. Relationships between red-sequence optical richness (Bgc,red) and global cluster X-ray properties (TX, LX, and M2500) are also examined and fitted.
Cosmology: Observations - Galaxies: Clusters: General - X-Rays: Galaxies: Clusters
erratum vol. 672, p.1293 (2008)
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