Characterizing the X-Ray Properties of Galaxy Clusters at z virgul 0.75

We propose to compare Xray luminosities and temperatures of a sample ofconfirmed opticallyselected z virgul 0.7 clusters to welldetermined velocitydispersions and weak lensing maps. The use of nonXray selected clustersenables us to search for large deviations in the Xray properties relative toother mass tracers. Our extensive VLT, HST, and NTT observational program hasprovided velocity measurements for between 30 and 60 cluster members per clusterand weak lensing maps augmented with photometric redshifts for six of the mostoptically luminous clusters at z virgul 0.75 in the Las Campanas Distant ClusterSurvey. Here we propose to complete this study by observing the remaining threeclusters from this sample. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]