The X-ray-Optical Relations for Nine Clusters at z = 0.7-1.1. (arXiv:1212.4219v1 [astro-ph.CO])

The X-ray-Optical Relations for Nine Clusters at z = 0.7-1.1. (arXiv:1212.4219v1 [astro-ph.CO]):
We use Chandra observations of nine optically and X-ray selected clusters in
five different structures at z ~ 0.7-1.1 from the Observations of Redshift
Evolution in Large-Scale Environments (ORELSE) survey to study diffuse X-ray
emission from galaxy clusters. X-ray gas temperatures and bolometric rest-frame
luminosities are measured for each cluster in the sample. We present new
redshift measurements, derived from dataobtained using the Deep Imaging
Multi-Object Spectrograph on the Keck 10-m telescope, for two clusters in the
RX J0910 supercluster at z ~ 1.1, from which velocity dispersions are measured.
Dispersions for all clusters are combined with X-ray luminosities and gas
temperatures to evaluate how the cluster properties compare to low-redshift
scaling relations. We also measure the degree of substructure in each cluster
by examining the velocity histograms, performing Dressler-Shectman tests, and
computing the offsets between the X-ray emission center and optically-derived
centroids. We find that only two clusters show clear indications of being
unrelaxed, based on their scaling relations and other dynamical state
diagnostics. Using our sample, we evaluate the redshift evolution of the L_x-T
relation and investigate the implications of our results for precision
cosmology surveys.