Parkes radio sources in the directions of southern rich clusters

Astronomy and Astrophysics – Astronomy

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Galactic Clusters, Radio Sources (Astronomy), Sky Surveys (Astronomy), Southern Sky, Astronomical Catalogs, Extragalactic Radio Sources

Scientific paper

A listing of all Parkes radio sources coincident within 0.3 cluster radii of southern rich clusters of galaxies studied by Abell et al. (1989) is compiled. A pronounced peak of radio sources very near the cluster centers was found. Bautz Morgan type I clusters tend to have more powerful radio sources and are radio-load about 5 times more often than clusters without dominant central galaxies. There is no strong correlation between radio emission and richness class. It is found that the slope of the cluster-radio source two-point angular correlation function is twice that of the galaxy-galaxy correlation function. Furthermore, the correlation amplitude for stronger sources (greater than 0.65 Jy) is nearly twice that of the entire Parkes catalog sample suggesting a tighter correlation with cluster centers for the stronger sources. Finally, the distribution of spectral indices for Parkes sources within ACO clusters is different from that outside the clusters; stronger cluster sources have steeper spectra on average.

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