Radio Sources in Clusters of Galaxies

Abstract

Sixty-five radio sources in the 4C catalogue lie within 0.3 of the radius, R_c, defined by Abell (1958),of the centre of an Abell cluster of galaxies. Statistically few of these are expected to be chance coincidences and hence they provide â well defined statistical sample of sources in rich clusters of galaxies. Over the last 6 years sources from this sample having declinations greater than 10° have been observed with high resolution using the Cambridge One-Mile telescope by Slingo (1974(a) and (b)), Riley (1975) and by myself (1977, in preparation). The number of sources observed and the number expected by chance at different distances from the cluster centre are shown in Table I; the radio positions used are from the 4C catalogue.