Abstract

Radio Halos are diffuse synchrotron radio sources observed in a number of galaxy clusters. To test the theoretical models proposed for their origin, mass-selected samples of GCs with adequate radio and Xray data are necessary. We select from the Planck SZ catalogue clusters with M ≳ 6 × 10¹⁴M_ʘ and 0.08 < z < 0.33. We use the NVSS and the Extended GMRT RH survey and find that RHs are preferentially found in massive/merging systems, while clusters without RH are less massive and relaxed.