X-ray confirmation of proper motion selected star clusters

We have selected two young star clusters for Xray imaging which nicely fit intothe wide fieldofview of XMM. These two young massive clusters (age <virgul 10 Myr,mass virgul 1E4 M_sun) have been identified in the ASCC2.5 catalogue (Kharchenko2001) providing proper motions and B,V photometry. The goal is to detect theclusters in image space (their intermediate and lowmass members, that is) inXrays. It is only in Xrays that the young cluster members stand out againstthe background field contamination, while they are drowned in optical andinfrared observations. Their detection would silence major criticism that hasbeen raised against the method of determining young cluster masses by fittingKing profiles, independent of cluster luminosity. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]