X-ray Observations of a SZ Discovered Cluster at z = 1.47

We propose to use XMMNewton to observe an exceptional cluster at z 1.47discovered via the SunyaevZel.dovich (SZ) effect by the South Pole Telescope(SPT). The cluster, SPTCL J20404451, is the highest redshift cluster yetdiscovered by SPT, with a spectroscopic redshift of z1.47. We predict thatSPTCL J20404451 has a mass of 5.6e14 Msun, an Xray temperature of 6.0 keV,and an Xray luminosity of 11e44 ergs/s. These properties would place SPTCLJ20404451 amongst the most massive known clusters at z > 1.4, and an importantsystem to study the earliest forming massive clusters. We are requesting a 75ksec observation with XMMNewton; enough to obtain 2000 Xray photons, andmeasure an Xray luminosity and temperature of this young massive cluster. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]