A&A 412, 341-347 (2003)
Simultaneous determination of and H from joint Sunyaev-Zeldovich effect and X-ray observations with median statisticsM. Sereno
Dipartimento di Scienze Fisiche, Università degli Studi di Napoli "Federico II", Via Cinthia, Compl. Univ. di Monte S. Angelo, 80126 Napoli, Italia
(Received 1 April 2003 / Accepted 15 September 2003 )
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- level, the pressureless matter density, , to be between 0.30 and 0.40 and the Hubble constant, H0, between 44 and 66 km s -1 Mpc -1.
Key words: cosmology: cosmic microwave background -- cosmology: cosmological parameters -- cosmology: distance scale -- galaxies: clusters: general -- X-rays: galaxies: clusters
© ESO 2003