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We have obtained deep SZ observations towards 15 of the apparently hottestXMM Cluster Survey (XCS) clusters that can be observed with the ArcminuteMicrokelvin Imager (AMI). We use a Bayesian analysis to quantify thesignificance of our SZ detections. We detect the SZ effect at high significancetowards three of the clusters and at lower significance for a further twoclusters. Towards the remaining ten clusters, no clear SZ signal was measured.We derive cluster parameters using the XCS mass estimates as a prior in ourBayesian analysis. For all AMI-detected clusters, we calculate large-scale massand temperature estimates while for all undetected clusters we determine upperlimits on these parameters. We find that the large- scale mean temperaturesderived from our AMI SZ measurements (and the upper limits from nulldetections) are substantially lower than the XCS-based core-temperatureestimates. For clusters detected in the SZ, the mean temperature is, onaverage, a factor of 1.4 lower than temperatures from the XCS. For clustersundetected in SZ, the average 68% upper limit on the mean temperature is afactor of 1.9 below the XCS temperature.

SZ observations with AMI of the hottest galaxy clusters detected in the XMM-Newton Cluster Survey