Updating scaling relations for low-mass galaxy groups from the PSPC samples

Galaxy groups are ideal systems to study baryonic physics, which is importantfor both using Xray observations of clusters for precision cosmology andstudying galaxy formation and evolution. Our understanding on the hot gasproperties of galaxy groups has been greatly improved with XMM and Chandra.However, limited progress has been made for lowmass groups. In fact, the LTrelations in the literature still use the ROSAT PSPC results for such lowmassgroups, even though the PSPC results can be quite uncertain. We have started aproject for a complete reanalysis of the kT < 0.6 keV groups from the PSPCsamples with XMM and Chandra data. Two groups need new XMM observations, whichare requested here. The results will extend important scaling relations to lower mass groups. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]