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Issue A&A
Volume 419, Number 1, May III 2004
Page(s) 47 - 61
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20035765



A&A 419, 47-61 (2004)
DOI: 10.1051/0004-6361:20035765

The X-ray luminosity function of galaxies in the Coma cluster

A. Finoguenov1, 2, U. G. Briel1, J. P. Henry3, 1, G. Gavazzi4, J. Iglesias-Paramo5 and A. Boselli5

1  Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, 85748 Garching, Germany
2  Space Research Institute, Profsoyuznaya 84/32, Moscow 117810, Russia
3  Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, Hawaii 96822, USA
4  Universitá degli Studi di Milano-Bicocca, Piazza della Scienza 3, 20126 Milano, Italy
5  Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille, France

(Received 28 November 2003 / Accepted 27 January 2004)

Abstract
The XMM-Newton survey of the Coma cluster of galaxies covers an area of 1.86 square degrees with a mosaic of 16 pointings and has a total useful integration time of 400 ks. Detected X-ray sources with extent less than $10^{\prime\prime}$ were correlated with cataloged galaxies in the Coma cluster region. The redshift information, which is abundant in this region of the sky, allowed us to separate cluster members from background and foreground galaxies. For the background sources, we recover a typical ${\rm Log}\,N-{\rm Log}\,S$ in the flux range 10-15-10-13 ergs s -1 cm -2 in the 0.5-2.0 keV band. The X-ray emission from the cluster galaxies exhibits X-ray colors typical of thermal emission. The luminosities of Coma galaxies lie in the 1039-1041 ergs s -1 interval in the 0.5-2.0 keV band. The luminosity function of Coma galaxies reveals that their X-ray activity is suppressed with respect to the field by a factor of 5.6, indicating a lower level of X-ray emission for a given stellar mass.


Key words: X-rays: galaxies -- galaxies: ISM -- galaxies: luminosity function, mass function -- galaxies: fundamental parameters

Offprint request: A. Finoguenov, alexis@xray.mpe.mpg.de

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© ESO 2004


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