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Radio relics are diffuse synchrotron sources in galaxy clusters that arebelieved to trace large-scale shock waves. We have discovered a new doubleradio relic system in PSZ1 G096.89+24.17 (z=0.3) and have carried out afull-polarization radio observation using the Westerbork Synthesis RadioTelescope (WSRT) at 1.4 GHz. The observation revealed the presence of tworelics located on the two diametrically opposite sides of the cluster and hintsof a central radio halo. The linear sizes of the relics are $\sim 0.9$ and$\sim 1.4$ Mpc.  We carried out an analysis of all known double radio relics by using radio,X-ray and Sunyaev-Zeldovich (SZ) data. We find that the radio luminosity ofdouble relics is a steep function of the cluster mass, with $L_R \proptoM^{2.83\pm0.39}$. If we include single radio relics, this relation ismaintained. This dependence has implications for the origin of magnetic fieldsat the relic's locations.

A new double radio relic in PSZ1 G096.89+24.17 and a radio relic mass-luminosity relation