Deep X-ray Spectroscopy of the Most Distant comma Massive Clusters Known

We propose to observe the six most massive clusters at z>1.2, discovered via theSunyaevZel.dovich (SZ) effect by the South Pole Telescope (SPT). The proposed700 ks program will provide deep Xray spectroscopy for a sample that is alreadyrich in multiwavelength data from a variety of telescopes, including Spitzer,Hubble, and Chandra. These new data, coupled with spatiallyresolved Xrayimaging from Chandra, will provide the first constraints on the thermodynamicprofiles for a complete sample of galaxy clusters at z>1.2, allowing us to studya variety of physical processes in clusters cores and outskirts, and testpredictions of self similarity and AGN feedback models, at a time shortly afterthese systems formed. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]