090123

We propose to observe 8 galaxy groups with a total exposure time of 68 ks tocomplete observations for a flux limited sample consisting of 67 objects. Wewill use this well-defined sample to study the scaling law properties of locallow-mass systems. Only with the requested observations we will be able tocorrect for sample selection effects entering in the scaling relationsincreasing the constraining power by a factor of 2 compared to previous samples.Furthermore we will determine detailed thermodynamic profiles within R2500(i.e. the region where simulations differs more noticeably) putting constraintson the feedback processes. [truncated! Please see actual data for full text]