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We present new XMM-Newton observations extending the mosaic of the Perseuscluster out to the virial radius to the west. Previous studies with ROSAT havereported a large excess in surface brightness to the west, possibly the resultof large scale gas sloshing, but lacked the spatial resolution and depth todetermine if this excess lay behind a cold front. In our new XMM observationswe have found that there is a sharp edge in X-ray surface brightness near thecluster virial radius (1.7Mpc) to the west, with a width comparable to the meanfree path. The temperature measurements obtained with Suzaku data across thisedge show that the temperature increases sharply outside this edge. All ofthese properties are consistent with this edge being the largest cold frontever observed in a galaxy cluster. We also find a second edge to the west,1.2Mpc from the core, which also appears to be a cold front. Our resultsindicate that magnetic fields are able to stabilize the cold fronts againstturbulence all the way out to the cluster virial radius. By comparing withnumerical simulations, we find that these large cold fronts require largeimpact parameter, low mass ratio mergers which can produce fast gas motionswithout destroying the cluster core.

Is there an enormous cold front at the virial radius of the Perseus cluster?