CONFIRMATION OF A THICK WHIM AT Z

We have retrived and analyzed the archival RGSXMM spectrum of the QSOQ0056363, which is located in the background of the Sculptor supercluster. Inthe spectrum we marginally detect (4sigma) OVII absorption features at theredshift of the intervening supercluster (z0.10), which is probably tracingWarmHot Intergalactic Medium (WHIM) in this large scale structure. Ifconfirmed, the implied column density of OVII is 3e17 cm2, i.e. one order ofmagnitude larger than the WHIM previously detected along other random lines ofsights. We propose a 100ksec RGS observation to confirm the OVII detection, andto detect or set tight upper limits to the features of OVIII and NeIX, whichwould allow to constrain the properties of this thick WHIM at z0.10. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]