Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-22
Astron.Astrophys.412:341-348,2003
Astronomy and Astrophysics
Astrophysics
8 pages, 2 figures, to appear in A&A
Scientific paper
10.1051/0004-6361:20031465
Clusters of galaxies contain a fair sample of the universal baryonic mass fraction. A combined analysis of the intracluster medium (ICM) within their hydrostatic regions, as derived from both Sunyaev-Zeldovich effect (SZE) measurements and X-ray images, makes it possible to constrain the cosmological parameters. We consider both gas fraction estimates and angular diameter distance measurements. Adopting median statistics, we find, at the 2-$\sigma$ level, the pressureless matter density, $\Omega_{\rm M0}$, to be between 0.30 and 0.40 and the Hubble constant, $H_0$, between 44 and 66 Km s$^{-1}$ Mpc$^{-1}$.
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