Issue |
A&A
Volume 387, Number 1, May III 2002
|
|
---|---|---|
Page(s) | 56 - 62 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20020394 | |
Published online | 15 May 2002 |
SZ and X-ray combined analysis of a distant galaxy cluster, RX J2228+2037
1
CESR–CNRS, 9 Av. du Colonel Roche, 31028 Toulouse, France
2
Astronomical Institute, Tohoku University, Sendai 980-8578, Japan
3
SAp–CEA, L'Orme des Merisiers, 91191 Gif-sur-Yvette Cedex, France
4
Department of Astrophysical Sciences, Princeton, NJ 08544, USA
5
National Astronomical Observatory, Mitaka Tokyo 181-8588, Japan
6
Nobeyama Radio Observatory, Minamimaki Nagano 384-1305, Japan
7
Max-Planck Institut Für Extraterrische Physik, Garching 85740, Germany
Corresponding author: E. Pointecouteau, etienne@astr.tohoku.ac.jp
Received:
14
December
2001
Accepted:
4
March
2002
We have performed a combined analysis of X-ray and Sunyaev-Zel'dovich data in
the direction of the distant galaxy cluster, RX J2228+2037.
Fitting a β-model to the high-resolution HRI data gives kpc and
.
The dependency of the Sunyaev-Zel'dovich effect with respect to the gas
temperature allows us, through the additional use of the 21 GHz data
of the cluster, to determine
keV.
Extrapolating the gas density profile out to the virial radius
(
Mpc), we derived a gas mass of
. Within the
hypothesis of hydrostatic equilibrium, the corresponding extrapolated total
mass for this source is:
, which corresponds to a gas fraction of
.
Our results on the temperature and on the cluster
mass classify RX J2228+2037 among the distant, hot and very massive
galaxy clusters.
Our work highlights the power of the association of galaxy cluster mapping
observations in X-ray and the SZ effect to derive the cluster's physical
properties, even without X-ray spectroscopy.
Key words: cosmology: observation / galaxies: clusters: individual: RX J2228+2037 / galaxies: intergalactic medium
© ESO, 2002
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