Radio and Optical Observations of the Hercules Cluster of Galaxies

Radio scans across the Hercules Cluster of galaxies (Abell 2151) were compared with optical counts of numbers of galaxies per unit solid angle. An unresolved radio source was found to occupy the same position, within the limits of measurement, as the optical center of the cluster. In addition, a broad region of emission approximately centered on the cluster was found at the lower frequencies