| Issue |
A&A
Volume 412, Number 2, December III 2003
|
|
|---|---|---|
| Page(s) | 341 - 347 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20031465 | |
| Published online | 28 November 2003 | |
Simultaneous determination of 
and H0 from joint
Sunyaev-Zeldovich effect and X-ray observations with median statistics
Dipartimento di Scienze Fisiche, Università degli Studi di Napoli “Federico II", Via Cinthia, Compl. Univ. di Monte S. Angelo, 80126 Napoli, Italia
Corresponding author: sereno@na.infn.it
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-σ 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
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