2000/06/27 by Gabriele Giovannini, Giovannini, Gabriele, Luigina Feretti +3
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0006380
Contributed talk at IAU 199 "The Universe at Low Radio Frequencies" in Pune, India, 1999
arxiv created 2000/06/27 · arxiv updated 2009/12/01
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.