Measuring $Ω_m$ with the ROSAT Deep Cluster Survey

Details Measuring $Ω_m$ with the ROSAT Deep Cluster Survey Measuring $Ω_m$ with the ROSAT Deep Cluster Survey

2001-06-24

arxiv.org/abs/astro-ph/0106428v1

Astrophys.J. 561 (2001) 13-21

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures, to appear in Astrophysical Journal

Scientific paper

10.1086/323214

We analyze the ROSAT Deep Cluster Survey (RDCS) to derive cosmological constraints from the evolution of the cluster X-ray luminosity distribution. The sample contains 103 galaxy clusters out to z=0.85 and flux-limit Flim=3 10^{-14} cgs (RDCS-3) in the [0.5-2.0] keV energy band, with a high-z extension containing four clusters at 0.901 10^{-14} cgs (RDCS-1). Model predictions for the cluster mass function are converted into the X-ray luminosity function in two steps. First we convert mass into intra-cluster gas temperature by assuming hydrostatic equilibrium. Then temperature is converted into X-ray luminosity by using the most recent data on the Lx-T relation for nearby and distant clusters. These include the Chandra data for seven distant clusters at 0.57

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