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Radio halos are synchrotron radio sources detected in some massive galaxyclusters. Their Mpc-size indicates that (re)acceleration processes are takingplace in the host cluster. X-ray catalogues of galaxy clusters have been usedin the past to search for radio halos and to understand their connection withcluster-cluster mergers and with the thermal component of the intra-clustermedium. More recently, the Sunyaev-Zel'dovich effect has been proven to be abetter route to search for massive clusters in a wider redshift range. With theaim of discovering new radio halos and understanding their connection withcluster-cluster mergers, we have selected from the Planck Early source catalogthe most massive clusters, and we have observed with the Giant Metrewave RadioTelescope at 323 MHz those objects for which deep observations were notavailable. We have discovered new peculiar radio emission in three of theobserved clusters finding: (i) a radio halo in the cluster RXCJ0949.8+1708;(ii) extended emission in Abell 1443 that we classify as a radio halo plus aradio relic, with a bright filament embedded in the radio halo; (iii) low-powerradio emission is found in CIZA J1938.3+5409 which is ten times below the radio- X-ray correlation, and represents the first direct detection of the radioemission in the "upper-limit" region of the radio - X-ray diagram. We discussthe properties of these new radio halos in the framework of theoretical modelsfor the radio emission.

Radio halos in SZ-selected clusters of galaxies: the making of a halo?