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

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.