UGC 10853: An Unusually Bright Radio Relic-Halo in a Merging Poor Cluster

UGC 10853 is at the center of an optically poor cluster of galaxies (CGCG339038) with a high Xray luminosity for its optical richness. It also containsa large diffuse radio source which is likely to be a cluster radio relic orhalo. The galaxy distribution and existing very shallow ROSAT Xray imagesuggest the cluster is undergoing a merger. We propose the first detailed Xrayobservation (43 ksec) of this poor cluster. We will determine the globalproperties of the cluster and estimate its mass. The dynamical state of thecluster will be studied, and we will derive a likely merger scenario. We willsearch for a merger shock at the sharp NE edge of the radio relic/halo. Thisobservation will extend the study of cluster radio relics to lower mass clusters and groups. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]