Scaling Properties and the Effects of Feedback for a Complete Sample of Groups

Upcoming Xray surveys like eROSITA, require precise calibration between Xrayobservables and mass, down to the lowmass regime to set tight constraints onthe cosmological parameters. We propose to observe 17 galaxy groups to completeobservations for a flux limited sample consisting of 69 objectss. We will usethe sample to study the scaling properties of the lowmass systems with a viewto the eROSITA survey which is expected to detect 100,000 objects, most of themin the low mass regime. Thanks to the completeness and the size of the selectedsample we will correct for selection biases the observed scaling relations.Furthermore, we will investigate the relative importance of nongravitationalprocesses by studying their thermodynamical properties beyond R1000. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]