Evolution of the Cluster Abundance from the ROSAT Deep Cluster Survey

Details Evolution of the Cluster Abundance from the ROSAT Deep Cluster Survey Evolution of the Cluster Abundance from the ROSAT Deep Cluster Survey

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aspc..176...40b&link_type=abstract

Observational Cosmology: The Development of Galaxy Systems, Proceedings of the International Workshop held at Sesto Pusteria, Bo

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We use results from the Rosat Deep Cluster Survey (RDCS, Rosati et al. 1998) to characterize the evolution of the cluster abundance out to redshift z≍ 0.8. Based on the Press--Schechter approach to follow the evolution of the mass--function and on an empirical prescription to convert masses into observed X--ray cluster fluxes, we obtain constraints on cosmological models. We apply a maximum--likelihood approach to the RDCS redshift-- and luminosity--distribution. Although the resulting constraints on Ω_0 are sensitive to the assumed X--ray luminosity--temperature relation, we find that a low--density Universe with Ω_0≍ 0.3--0.5 is in general to be preferred with respect to the Ω_0 = 1 case. A critical--density Universe would require a rather strong positive evolution of the L_X--T_X relation, which seems to be in contrast with current observations.

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