Simultaneous determination of Ω M0 and H0 from joint Sunyaev-Zeldovich effect and X-ray observations with median statistics
M. Sereno
Abstract
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-σ level, the pressureless matter density, Ω M0, to be between 0.30 and 0.40 and the Hubble constant, H0, between 44 and 66 Km s-1 Mpc-1.
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