086108

We propose a unique XMM study of 7 galaxy groups selected by UV absorption in HST-COS spectra. Combining XMM observations and UV absorption spectroscopy of these group will yield new constraints on the state of the intra-group medium. The targets are similar in velocity dispersion openParsigmavirgul300-500km-sclosePar and richness. All have broad Ly-a absorption comma and but only 4 have detectable OVI absorption. The 3 groups with XMM observations show that two with OVI are associated with clear X-ray dominant groups comma while the other with no OVI is not. We will test the ideas from numerical simulations comma where the relationships between thermodynamic properties of the hot gas and the presence of multiphase gas depend significantly on feedback mechanisms comma merger history comma and star formation history.