The thermal structure of the cool core in the Phoenix cluster

The SZselected cluster SPTCLJ23444243 at zvirgul0.56 (the Phoenix cluster) showsfor the first time a hint of a massive coolingflowinduced starburst,suggesting that the feedback source responsible for preventing runaway coolingmay not yet be fully established. We propose to robustly estimate the emissionmeasure distribution of the cool core in the Phoenix cluster, and itstemperature and abundance profiles out to 500 kpc, with a mediumdeep (210 ks)EPIC observation, in order to investigate the actual structure of the cool core.The proposed study will provide secure science results with a relatively modestexposure, paving the way to an eventual deeper observation of this exceptionaland puzzling source. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]