Radio relic/merger connection in the clusters A548b and A1664

The clusters A548b and A1664 are peculiar in the radio domain because of thepresence of radio relics. These are very extended diffuse radio sources, locatedin cluster peripheral regions, and associated with the intracluster medium.According to theoretical models, the radio relics are energized by clustermerger shocks. We wish to investigate the cluster Xray properties, the statusof the intracluster medium, the presence of shocks, filaments or cold fronts, inorder to analyze the energy transfer between the thermal gas and the radioemitting particles. The study of the connection between Xray and radio emissionwill be crucial to understand the formation of relics, and more generally of thenonthermal components in clusters, and their relation to the cluster dynamics. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]