X-raying the Giant HII Region G305

G305, one of the nearest giant HII regions, contains a WR binary, eight distinctclusters each containing hundreds of stars and eight maser sources and HIIregions each containing 48 very young O stars. The bubble contains virgul30 O starssuggesting a population virgul15,000 cluster members. A 125ks ACIS exposure willdetect all of the highmass stars and a high fraction of the lowmass YSOs in central clusters and HII regions. A 60ks EPIC exposure will do the same in thesparser outer clusters and HII regions. The EPIC observation may detect diffuseemission in the inner cavity or within the optical HII region RCW 74. ACIS andEPIC spectra of the highmass stars, EPIC and RGS spectra of WR 48a, EPIC spectra of diffuse.. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]