Warm And Hot Gases In And Around Cluster Galaxies At Z=0.1-0.2

We propose a joint HST/XMMNewton observing program to study both warm and hotgases in three opticallyselected galaxy clusters at z0.1170.2108. Eachcluster has a UVbright background QSO projected within the expected strongaccretion shock (< 2r_200). We will observe UV absorption lines of the O VIdoublet, HI Lyalpha and Lybeta, and other ion transitions in the rest frame ofthe clusters, using the HST/COS G130M grating. These absorption lines aresensitive to the thermal, kinetic, and chemical properties of warm (T < 10^6K) gas, associated with the halos of individual galaxies and the intraclustermedium. Chandra/ACIS observations will be used to measure the luminosity,temperature, and morphology of the hot gas component of the clusters. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]