Hot Gas in Low Redshift comma Massive OVI+Ly-Alpha Absorption-Line Systems

We propose a unique XMM study of 7 galaxy groups selected by UV absorption inHST/COS spectra. Combining XMM observations and UV absorption spectroscopy ofthese group will yield new constraints on the state of the intragroup medium.The targets are similar in velocity dispersion (sigmavirgul300500km/s) and richness.All have broad Lya absorption, and but only 4 have detectable OVI absorption.The 3 groups with XMM observations show that two with OVI are associated withclear Xray dominant groups, while the other with no OVI is not. We will testthe ideas from numerical simulations, where the relationships betweenthermodynamic properties of the hot gas and the presence of multiphase gasdepend significantly on feedback mechanisms, merger history, and star formation history. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]