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Date and Time of the Query: 2019-04-25 T14:03:46 PDT
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For refcode 2011MNRAS.418.1089C:
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Copyright by Royal Astronomical Society. 2011MNRAS.418.1089C X-ray calibration of Sunyaev-Zel'dovich scaling relations with the ACCEPT catalogue of galaxy clusters observed by Chandra Comis, B.; de Petris, M.; Conte, A.; Lamagna, L.; de Gregori, S. Abstract. We explore the scaling relation between the flux of the Sunyaev-Zel'dovich (SZ) effect and the total mass of galaxy clusters using already reduced Chandra X-ray data present in the ACCEPT (Archive of Chandra Cluster Entropy Profile Tables) catalogue. The analysis is conducted over a sample of 226 objects, examining the relatively small scale corresponding to a cluster overdensity equal to 2500 times the critical density of the background universe, at which the total masses have been calculated exploiting the hydrostatic equilibrium hypothesis. Core entropy (K_0_) is strongly correlated with the central cooling time, and is therefore used to identify cooling-core (CC) objects in our sample. Our results confirm the self-similarity of the scaling relation between the integrated Comptonization parameter (Y) and the cluster mass, for both CC and NCC (non-cooling-core) clusters. The consistency of our calibration with recent ones has been checked, with further support for Y as a good mass proxy. We also investigate the robustness of the constant gas fraction assumption, for fixed overdensity, and of the Y_X_= M_gas_ T_x_ proxy considering CC and NCC clusters, again sorted on K_0_ from our sample. We extend our study to implement a K_0_-proxy, obtained by combining SZ and X-ray observables, which is proposed to provide a CC indicator for higher redshift objects. Finally, we suggest that an SZ-only CC indicator could benefit from the employment of deprojected Comptonization radial profiles. Key words: galaxies: clusters: intracluster medium, large-scale structure of Universe, X-rays: galaxies: clusters
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