The baryon mass function for galaxy clusters
Résumé
Context: .The evolution of the cluster abundance with redshift is known to be a powerful cosmological constraint when applied to X-ray clusters. Recently, the evolution of the baryon mass function has been proposed as a new variant that is free of the uncertainties present in the temperature-mass relation. A flat model with ?M ? 0.3 was shown to be preferred in the case of a standard cold dark matter scenario. Aims: .We compared the high redshift predictions of the baryon mass in clusters with data for a more general class of spectra with a varying shape factor ? without any restriction to the standard cold dark matter scenario in models normalized to reproduce the local baryon mass function. Methods: .Using various halo mass functions existing in the literature we evaluated the corresponding baryon mass functions for the case of the non-standard power spectra mentioned previously. Results: .We found that models with ?M ? 1 and ? ? 0.12 reproduce high redshift cluster data just as well as the concordance model does. Conclusions: .Finally, we conclude that the baryon mass function evolution alone does not efficiently discriminate between the more general family of flat cosmological models with non-standard power spectra.