Tracing a filament in the outskirts of the Shapley Supercluster

We propose two XMMNewton snapshot observations to detect all the point sourcesin the region between the double galaxy cluster A3528 and the complex A3530A3532, in which we have discovered hints of a filamentary emission. Thesesnapshots will complement our Suzaku observations. We aim to detect the hottestand densest phase of the Warm Hot Intergalactic Medium in the vicinity ofclusters by its thermal soft Xray emission. For this purpose, we will use theXMMNewton observations to correct precisely for the point sources, resulting inan improvement of the temperature measurement uncertainty by a factor of three.In addition to a full understanding of the typical baryon fraction, we willstudy the possible gas clumping in the cluster outskirts. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]