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Issue A&A
Volume 365, Number 1, January I 2001
First Results from XMM-Newton
Page(s) L60 - L66
DOI http://dx.doi.org/10.1051/0004-6361:20000024



A&A 365, L60-L66 (2001)
DOI: 10.1051/0004-6361:20000024

A mosaic of the Coma cluster of galaxies with XMM-Newton

U. G. Briel1, J. P. Henry1,2, D. H. Lumb3, M. Arnaud4, D. Neumann4, N. Aghanim5, R. Gastaud4, J. P. D. Mittaz6, T. P. Sasseen7 and W. T. Vestrand8.

1  Max-Planck-Institut für extraterrestrische Physik, 85748 Garching, Germany
2  Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, Hawaii 96822, USA
3  XMM Science Operations Centre, Space Science Division ESTEC, Postbus299, 2200AG Noordwijk, The Netherlands
4  CEA/DSM/DAPNIA Saclay, Service d'Astroph., L'Orme de Merisiers, Bât. 709, 91191 Gif-sur-Yvette, France
5  IAS-CNRS, Bât. 121, Université Paris-Sud, 91405 Orsay Cedex, France
6  Mullard Space Science Laboratory, Holmbury St. Mary, Surrey, RH6 6NT, UK
7  Dept. of Physics, University of California at Santa Barbara, Santa Barbara, CA 93106, USA
8  NIS-2, MS D436, Los Alamos National Laboratory, Los Alamos, NM 87545, USA

(Received 6 October 2000 / Accepted 4 November 2000 )

Abstract
The Coma cluster of galaxies was observed with XMM-Newton in 12 partially overlapping pointings. We present here the resulting X-ray map in different energy bands and discuss the large scale structure of this cluster. Many point sources were found throughout the observed area, at least 11 of them are coincident with bright galaxies. We also give a hardness ratio map at the so far highest angular resolution obtained for a cluster of galaxies. In this map we found soft regions at the position of bright galaxies, little variation in the central 15 arcmin, but some harder regions north of the line NGC 4874 -NGC 4889.


Key words: coma -cluster of galaxies -intergalactic medium - large-scale structure of the Universe -X-rays

Offprint request: U. G. Briel, ugb@mpe.mpg.de

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