The spectacular cluster chain Abell 781 as observed with LOFAR, GMRT, and <i>XMM-Newton</i>
The spectacular cluster chain Abell 781 as observed with LOFAR, GMRT, and <i>XMM-Newton</i>
A number of merging galaxy clusters show the presence of large-scale radio emission associated with the intra-cluster medium (ICM). These synchrotron sources are generally classified as radio haloes and radio relics. Whilst it is commonly accepted that mergers play a crucial role in the formation of radio haloes and relics, …