A&A 404, 63-74 (2003)
DOI: 10.1051/0004-6361:20030481

XMM observation of the dynamically young galaxy cluster CL 0939+4713

E. De Filippis^{1, 2}, S. Schindler^{3, 1} and A. Castillo-Morales<sup>4, 1

1</sup>  Astrophysics Research Institute, Liverpool John Moores University, Birkenhead CH41 1LD, UK
²  Center for Space Research, Massachusetts Institute of Technology, 70 Vassar Street, Building 37, Cambridge, MA 02139, USA
³  Institut für Astrophysik, Leopold-Franzens-Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria
⁴  Dpto. Física Teórica y del Cosmos, Universidad de Granada, Avda. Fuentenueva s/n, 18002 Granada, Spain

(Received 13 August 2002 / Accepted 24 March 2003 )

Abstract
We present an XMM observation of the distant galaxy cluster CL 0939+4713. The X-ray image shows pronounced substructure, with two main subclusters which have even some internal structure. This is an indication that the cluster is a dynamically young system. This conclusion is supported by the temperature distribution: a hot region is found between the two main subclusters indicating that they are at the beginning of a major merger, and that they will probably collide in a few hundreds of Myr. The intra-cluster gas of CL 0939+4713 shows inhomogeneities in the metal distribution, with the optically richer subcluster having a higher metallicity.

Key words: galaxies: clusters: general -- intergalactic medium -- galaxies: evolution -- cosmology: observations -- cosmology: theory -- X-rays: galaxies: clusters

Offprint request: E. De Filippis, bdf@space.mit.edu

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