EDP Sciences
Free access
Volume 429, Number 1, January I 2005
Page(s) 85 - 99
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20041296

A&A 429, 85-99 (2005)
DOI: 10.1051/0004-6361:20041296

XMM-Newton study of the lensing cluster of galaxies CL 0024+17

Y.-Y. Zhang1, H. Böhringer1, Y. Mellier2, G. Soucail3 and W. Forman4

1  Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, 85748 Garching, Germany
    e-mail: yyzhang@mpe.mpg.de
2  Institut d'Astrophysique de Paris, 98bis Bd. Arago, 75014 Paris, France
3  Observatoire Midi-Pyrénées, Laboratoire d'Astrophysique, MR 5572, 14 avenue E. Belin, 31400 Toulouse, France
4  Harvard-Smithsonian Center for Astrophysics (CFA), 60 Garden Street, Cambridge, MA 02138, USA

(Received 14 May 2004 / Accepted 27 August 2004)

We present a detailed gravitational mass measurement based on the XMM-Newton imaging spectroscopy analysis of the lensing cluster of galaxies CL 0024+17 at z=0.395. The emission appears approximately symmetric. However, on the scale of  $r \sim 3.3^{\prime}$ some indication of elongation is visible in the northwest-southeast (NW-SE) direction from the hardness ratio map (HRM). Within  $3^{\prime}$, we measure a global gas temperature of  3.52  $\pm$ 0.17 keV, metallicity of  0.22  $\pm$ 0.07, and bolometric luminosity of  2.9  $\pm$ 0.1  $\times$ 1044 h-270 erg s -1. We derive a temperature distribution with an isothermal temperature of 3.9 keV to a radius of  $1.5^{\prime}$ and a temperature gradient in the outskirts ( $1.3^{\prime}<r<3^{\prime}$). Under the assumption of hydrostatic equilibrium, we measure gravitational mass and gas mass fraction to be M200=2.0  $\pm$ 0.3  $\times$ 1014  $h_{70}^{-1}~{M_{\odot}}$ and $f_{\rm gas}=0.20$  $\pm$ 0.03 h-3/270 at  r200=1.05 h-170 Mpc using the observed temperature profile. The complex structure in the core region is the key to explaining the discrepancy in gravitational mass determined from XMM-Newton X-ray observations and HST optical lensing measurements.

Key words: galaxies: clusters: individual: CL 0024+17 -- cosmology: dark matter -- gravitational lensing -- cosmology: observations -- X-rays: galaxies: clusters

SIMBAD Objects

© ESO 2004