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Shimwell, AMI Consortium: Timothy W; Rodríguez-Gonzálvez, Carmen; Feroz, Farhan; Franzen, Thomas M. O; Grainge, Keith J. B; Hobson, Michael P; Hurley-Walker, Natasha; Lasenby, Anthony N; Lloyd-Davies, E. J; Olamaie, Malak; Perrott, Yvette C; Pooley, Guy G; Rumsey, Clare; Romer, A. Kathy; Saunders, Richard D. E; Scaife, Anna M. M; Schammel, Michel P; Scott, Paul F; Titterington, David J; Waldram, Elizabeth M
Monthly Notices of the Royal Astronomical Society, 08/2013, Volume: 433, Issue: 4Journal Article
We have obtained deep Sunyaev-Zel'dovich (SZ) observations towards 15 of the hottest XMM Cluster Survey (XCS) clusters that can be observed with the Arcminute Microkelvin Imager (AMI). We use a Bayesian analysis to quantify the significance of our SZ detections. We detect the SZ effect at high significance towards three of the clusters and at lower significance for a further two clusters. Towards the remaining 10 clusters, no clear SZ signal was measured. We derive cluster parameters using the XCS mass estimates as a prior in our Bayesian analysis. For all AMI-detected clusters, we calculate large-scale mass and temperature estimates while for all undetected clusters we determine upper limits on these parameters. We find that the large-scale mean temperatures derived from our AMI SZ measurements (and the upper limits from null detections) are substantially lower than the XCS-based core-temperature estimates. For clusters detected in the SZ, the mean temperature is, on average, a factor of 1.4 lower than temperatures from the XCS. Our upper limits on the cluster temperature of undetected systems are lower than the mean XCS derived temperature.
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