The ROSAT Deep Cluster Survey: Constraints on Cosmology
Borgani, S. · Rosati, P. · Della Ceca, R. · Tozzi, P. · Norman, C.
Original · EN
We use the ROSAT Deep Cluster Survey (RDCS) to trace the evolution of the cluster abundance out to z≃ 0.8 and constrain cosmological models. We resort to a phenomenological prescription to convert masses into X-ray fluxes and apply a maximum-likelihood approach to the RDCS redshift- and luminosity-distribution. We find that, even changing the shape and the evolution on the Lbol-Tₓ relation within the observational uncertainties, a critical density Universe is always excluded at more than 3σ level. By assuming a non-evolving X-ray luminosity-temperature relation with shape Lbol∝ Tₓ³, it is Ωₘ=0.35⁺⁰.³⁵₋₀.₂₅ and σ₈=0.76⁺⁰.³⁸₋₀.₁₄ for flat models, with uncertainties corresponding to 3σ confidence levels.
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