090070

We propose to complete a unique XMM study of 7 galaxy groups selected by UV absorption in HST/COS spectra of background quasars. Combining X-ray and UV observations of these groups will yield new constraints on the state and locations of the systems. baryons. The groups are similar in velocity dispersion (virgul300-500 km/s) and richness. All have broad Ly-alpha absorption and but only 4 have detectable OVI absorption. XMM observations show that 2 with OVI are associated with clear X-ray dominant groups while the other observed 3 lacking OVI are not. We are proposing to observe the remaining two OVI-absorbing systems. We will test predictions from current numerical simulations for thermodynamic properties of multiphase gas feedback mechanisms merger history and star formation history. [truncated! Please see actual data for full text]