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Radio relics are Mpc-scale diffuse radio sources at the peripheries of galaxyclusters which are thought to trace outgoing merger shocks. We presentXMM-Newton and Suzaku observations of the galaxy cluster Abell 2744 (z=0.306),which reveal the presence of a shock front 1.5 Mpc East of the cluster core.The surface-brightness jump coincides with the position of a known radio relic.Although the surface-brightness jump indicates a weak shock with a Mach number$\mathcal{M}=1.7_{-0.3}^{+0.5}$, the plasma in the post-shock region has beenheated to a very high temperature ($\sim13$ keV) by the passage of the shockwave. The low acceleration efficiency expected from such a weak shock suggeststhat mildly relativistic electrons have been re-accelerated by the passage ofthe shock front.

A shock front at the radio relic of Abell 2744