A complete sample of massive MaxBCG clusters for scaling relations

Great progress on galaxy clusters has been made in the last several years withSZ and optical surveys. Some new puzzles also emerged and one of them is themismatch between the stacked Planck SZ fluxes and the model expectations for theMaxBCG clusters. While previous studies regarding this puzzle require thecalibration of the true mass and the standard pressure template, we bypass theintermediate steps to directly compare the pressure content derived from theXray data with the SZ flux, for massive MaxBCG clusters. This proposal requestsXMM data for 7 clusters to complete a sample of 38 most massive MaxBCG clustersobserved with either XMM or Chandra. The results will shed light on the mismatchpuzzle and constrain the important scaling relations like Y_X N & Y_X Y_SZ. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]