EDP Sciences
Free access
Volume 412, Number 2, December III 2003
Page(s) 341 - 347
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20031465

A&A 412, 341-347 (2003)
DOI: 10.1051/0004-6361:20031465

Simultaneous determination of $\Omega\mathsf{_{M0}}$ and H $\mathsf{_0}$ from joint Sunyaev-Zeldovich effect and X-ray observations with median statistics

M. 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- $\sigma$ level, the pressureless matter density, $\Omega_{\rm M0}$, 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