Unveiling the most massive Planck clusters at z>0.5 openParXMM LP re-observationsclosePar.

We have been awarded a Large Program in AO11 to gather spatially resolved X rayspectroscopy on a sample of 32 massive (M_500 > 5e+14Msun) clusters detectedblindly by Planck in the redshift range 0.5<z< 1. Using for the first time astatistically significant sample in this highmass, highredshift regime, ouraim is to study the fundamental scalings between YSZ, YX and M500, and thepressure and entropy profiles. This will provide an important probe of thephysics of cluster gravitational collapse and be of large legacy value for thecosmological exploitation of the Planck sample. We propose to reobserve 8targets, the observations of which are dramatically affected by flares. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]