Persistent shocks and feedback processes in the cluster VLSS J1431.8+1331

Recent simulations suggest that shocks in clusters have a longlasting impact onthe energetics and temperature distribution of the cluster gas. As a result allclusters should contain diffuse and filamentary regions with nonthermalparticles that predominantly radiate at extremely low radio frequencies. Here wepropose XMMNewton observations of the best candidate for such a longlivedshocked system, the 74 MHz radio source VLSS J1431.8+1331, located in a clusterat z0.16. The aims of the observations are to characterize the dynamical stateof the cluster and to relate density and temperature variations to the radiostructure. This will allow us to study the evolution of the energy content ofboth the thermal and nonthermal gas in the cluster on extremely long timescales. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]