X‐ray calibration of Sunyaev–Zel’dovich scaling relations with the ACCEPT catalogue of galaxy clusters observed by Chandra

作者: B. Comis , M. De Petris , A. Conte , L. Lamagna , S. De Gregori

DOI: 10.1111/J.1365-2966.2011.19562.X

关键词:

摘要: We explore the scaling relation between flux of Sunyaev–Zel’dovich (SZ) effect and total mass galaxy clusters using already reduced Chandra X-ray data present in ACCEPT (Archive Cluster Entropy Profile Tables) catalogue. The analysis is conducted over a sample 226 objects, examining relatively small scale corresponding to cluster overdensity equal 2500 times critical density background universe, at which masses have been calculated exploiting hydrostatic equilibrium hypothesis. Core entropy (K0) strongly correlated with central cooling time, therefore used identify cooling-core (CC) objects our sample. Our results confirm self-similarity integrated Comptonization parameter (Y) mass, for both CC NCC (non-cooling-core) clusters. consistency calibration recent ones has checked, further support Y as good proxy. also investigate robustness constant gas fraction assumption, fixed overdensity, = Mgas Tx proxy considering clusters, again sorted on K0 from extend study implement K0-proxy, obtained by combining SZ observables, proposed provide indicator higher redshift objects. Finally, we suggest that an SZ-only could benefit employment deprojected radial profiles.

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