Radio Halos and Relics in Clusters of Galaxies and Detection Statistics
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New sensitive VLA observations confirm the existence of halo and relic sources in 6 Abell clusters where a diffuse emission was found in the NVSS. We find evidence that the frequency of clusters with halos and relics is larger in clusters with high X-ray luminosity. The evidence that the occurrence of a halo source is larger at high redshifts is marginal.
Contributed talk at IAU 199 "The Universe at Low Radio Frequencies" in Pune, India, 1999
Contributed talk at IAU 199 "The Universe at Low Radio Frequencies" in Pune, India, 1999