Virgo Clusters at Redshift 0.35

The cluster Xray LT relationship is sensitive to feedback processes. Because Land T are used as surrogates for the cluster virial mass M, understanding theLT and the LTM relations and their scatter is critical for clusterconstraints on cosmological models, as well as models of galaxy and clusterevolution. We originally proposed to measure Lx and Tx for a representativesample of 13 lowLx, lowT (22.6 keV) clusters at z0.320.38, selected fromthe ROSAT 160SD survey. We will show the LTM relation for 6 of these clusterswith weaklensing masses obtained with HST. These clusters span the mass rangebetween rich clusters and groups, where feedback processes play an increasinglydominant role. This is a resubmission of an accepted proposal, to repeat 2 of 8 observations. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]