Constraining our Universe with X-ray & Optical Cluster Data

Abstract

We have used recent X-ray and optical data in order to impose some constraints on the cosmology and cluster scaling relations. Generically two kind of hypotheses define our model. First we consider that the cluster population is well described by the standard Press-Schechter (PS) formalism, and second, these clusters are supposed to follow scaling relations with mass: Temperature-Mass (T-M) and X-ray Luminosity-Mass (L_x - M). As a difference with many other authors we do not assume specific scaling relations to model cluster properties such as the usual $T-M$ virial relation or one observational determination of the $L_x-T$ relation. Instead we consider general free parameter scaling relations. With the previous model (PS plus scalings) we fit our free parameters to several X-ray and optical data with the advantage over many other works that we consider all the data sets at the same time. This prevents us from being inconsistent with some of the available observations. Among other interesting conclusions, we find that only low-density universes are compatible with all the data considered and that the degeneracy between ${\Omega }_m$ and ${\sigma }_8$ is broken. Also we obtain interesting limits on the parameters characterizing the scaling relations.

11 pages, 7 figures. MNRAS accepted version

References in corpus (7)

• A Flat Universe from High-Resolution Maps of the Cosmic Microwave Background Radiation
• MAXIMA-1: A Measurement of the Cosmic Microwave Background Anisotropy on angular scales of 10 arcminutes to 5 degrees
• First Estimations of Cosmological Parameters From BOOMERANG
• Measuring Cosmological Parameters from the Evolution of Cluster X-ray Temperatures
• An improved method of constructing binned luminosity functions
• The cluster M-T relation from temperature profiles observed with ASCA and ROSAT
• The WARPS survey - IV: The X-ray luminosity-temperature relation of high redshift galaxy clusters

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