Volume 533, September 2011
|Number of page(s)||6|
|Section||Cosmology (including clusters of galaxies)|
|Published online||24 August 2011|
Testing for evolution in scaling relations of galaxy clusters: cross analysis between X-ray and SZ observations
Université de Toulouse, UPS-OMP, IRAP, Toulouse, France
2 CNRS, IRAP, 14 avenue Édouard Belin, 31400 Toulouse, France
e-mail: email@example.com; firstname.lastname@example.org
Received: 2 November 2010
Accepted: 2 May 2011
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.
Key words: cosmological parameters / cosmology: observations / X-rays: galaxies: clusters
© ESO, 2011
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