Testing for evolution in scaling relations of galaxy clusters: cross analysis between X-ray and SZ observations

¹ Université de Toulouse, UPS-OMP, IRAP, Toulouse, France
² CNRS, IRAP, 14 avenue Édouard Belin, 31400 Toulouse, France
e-mail: luis.ferramacho@ast.obs-mip.fr; alain.blanchard@ast.obs-mip.fr

Received: 2 November 2010
Accepted: 2 May 2011

Abstract

Aims. We present predicted Sunyaev-Zeldovich (SZ) properties of known X-ray clusters of galaxies for which gas temperature measurements are available. The reference sample was compiled from the BAX database for X-ray clusters.

Methods. The Sunyaev-Zeldovich signal is predicted according to two different scaling laws for the mass-temperature relation in clusters: a standard relation and an evolving relation that reproduces well the evolution of the X-ray temperature distribution function in a concordance cosmology. Using a Markov chain Monte Carlo (MCMC) analysis we examine the values of the recovered parameters and their uncertainties.

Results. The evolving case can be clearly distinguished from the non-evolving case, showing that SZ measurements will indeed be efficient in constraining the thermal history of the intra-cluster gas. However, significant bias appears in the measured values of the evolution parameter for high SZ threshold owing to selection effects.