Determining the heat balance in groups and clusters

We propose to observe five cool clusters, in order to complete a fluxlimitedsample that does not suffer from optical selection bias. Cool clusters areexcellent probes for understanding the heat balance in all clusters since theirsmaller potentials mean that they are most susceptible to heating processes. Weaim to study, systematically, heating and cooling effects; together with thedispersion in the luminosity / temperature relation at temperatures below 2 keV(i.e. the intrinsic scatter in cluster properties). We have already madeconsiderable progress analyzing the existing archived observations, and requestadditional observations to complete the sample. With its greater collecting areaand lowenergy response, XMMNewton is the observatory of choice for this work. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]