Bulletin of the Astronomical Society of India
1Department of Physics and Astronomy, University of Bologna, via Ranzani 1, 40127 Bologna, Italy
2INAF-Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy
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Extensive radio surveys of galaxy clusters are key to solving the long standing puzzles regarding the origins of the diuse radio emission from the intra-cluster medium (ICM). These diuse sources are termed as radio halos and radio relics and are manifestations of the relativistic electrons and the magnetic fields in the ICM. The Extended GMRT Radio Halo Survey (EGRHS) is a deep radio survey of bright galaxy clusters at 610 and 235 MHz with the GMRT designed to study the statistical properties of radio halos and relics in the galaxy clusters. We summarize the statistical results from this survey and present two candidate diuse sources detected in Abell 2552 and Z5247. In addition to this, we have undertaken a follow up of Planck clusters with the GMRT and the Jansky Very Large Array. A radio halo has been discovered in the cluster Plck171.9-40.7 and a relic in the cluster Plck200.9-28.2. Our sensitive 610 MHz image of the cluster MACSJ1149.5+2223 shows that an earlier claimed relic is in fact a radio galaxy.
Keywords :radio continuum: general – galaxies: clusters: individual: Plck171.9-40.7, Plck200.9-28.2, MACSJ1149.5+2223