Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.290..177e&link_type=abstract
Astrophysics and Space Science, v. 290, Issue 1, p. 177-186 (2004).
Astronomy and Astrophysics
Astrophysics
1
Galaxies: Cluster: General, Galaxies: Fundamental Parameters, Intergalactic Medium, X-Ray: Galaxies, Cosmology: Observations, Dark Matter, Galaxies, Cluster, General &Mdash, Fundamental Parameters &Mdash, Intergalactic Medium &Mdash, X-Ray, Galaxies &Mdash, Cosmology, Observations &Mdash
Scientific paper
We present a study of the baryonic fraction in galaxy clusters aimed at constraining the cosmological parameters Ωm, ΩLgr; and the ratio between the pressure and density of the `dark' energy, w. We use results on the gravitating mass profiles of a sample of nearby galaxy clusters observed with the BeppoSAX X-ray satellite (Ettori, De Grandi and Molendi, 2002)to set constraints on the dynamical estimate of Ωm. We then analyze Chandra observations of a sample of eight distant clusters with redshift in the range 0.72 and 1.27 and evaluate the geometrical limits on the cosmological parameters Ωm, ΩΛ and w by requiring that the gas fraction remains constant with respect to the look-back time. By combining these two independent probability distributions and using a priori distributions on both Ωb and H 0 peaked around primordial nucleosynthesis and HST-Key Project results respectively, we obtain that, at 95.4 per cent level of confidence, (i) w < —0.54, (ii)Ωm = 0.34+0.11 —0.05, ΩΛ = 1.50+0.24 —1.13 for w = — 1 (corresponding to the case for a cosmological constant), and (iii) Ωm = 1 —ΩΛ = 0.33+0.06 —0.05 for a flat Universe. This paper summarizes the work in press at Astronomy & Astrophysics by Ettori, Tozzi and Rosati (astro-ph/0211335).
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