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Radio relics are Mpc-scale diffuse synchrotron sources found in galaxycluster outskirts. They are believed to be associated with large-scale shockspropagating through the intra-cluster medium, although the connection betweenradio relics and the cluster merger shocks is not yet proven conclusively. Wepresent a first tentative detection of a pressure jump in the well-known relicof the Coma cluster through Sunyaev-Zel'dovich (SZ) effect imaging.The SZE dataare extracted from the first public all-sky data release of Planck and we usehigh-frequency radio data at 2.3 GHz to constrain the shock-front geometry. TheSZE data provide evidence for a pressure discontinuity, consistent with therelic position, without requiring any additional prior on the shock-frontlocation. The derived Mach number M = 2.9 (+0.8/-0.6) is consistent with X-rayand radio results. A high-pressure "filament" without any pressurediscontinuity is disfavoured by X-ray measurements and a "sub-cluster" modelbased on the infalling group NGC 4839 can be ruled out considering thepublished mass estimates for this group. These results signify a first attempttowards directly measuring the pressure discontinuity for a radio relic and thefirst SZ-detected shock feature observed near the virial radius of a galaxycluster.

Evidence for a pressure discontinuity at the position of the Coma relic from Planck Sunyaev-Zel'dovich effect data