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We present the results of new Suzaku observations of the Coma Cluster, theX-ray brightest, nearby, merging system hosting a well studied, typical giantradio halo. It has been previously shown that, on the western side of thecluster, the radio brightness shows a much steeper gradient compared to otherazimuths. XMM-Newton and Planck revealed a shock front along the southern halfof the region associated with this steep radio gradient, suggesting that theradio emission is enhanced by particle acceleration associated with the shockpassage. Suzaku demonstrates for the first time that this shock front extendsnorthwards, tracing the entire length of the western edge of the Coma radiohalo. The shock is detected both in the temperature and X-ray surfacebrightness distributions and has a Mach number of around $\mathcal{M}\sim1.5$.The locations of the surface brightness edges align well with the edge of theradio emission, while the obtained temperature profiles seem to suggest shockslocated 125-185 kpc further out in radius. In addition, the shock strengthsderived from the temperature and density jumps are in agreement when usingextraction regions parallel to the radio halo edge, but become inconsistentwith each other when derived from radial profiles centred on the Coma Clustercore. It is likely that, beyond mere projection effects, the geometry of theshock is more complex than a front with a single, uniform Mach number and anapproximately spherically symmetric shape.

Suzaku observations of a shock front tracing the western edge of the giant radio halo in the Coma Cluster