EDP Sciences
Free access
Volume 435, Number 3, June I 2005
Page(s) 799 - 810
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20041520

A&A 435, 799-810 (2005)
DOI: 10.1051/0004-6361:20041520

A sample of X-ray emitting normal galaxies from the BMW-HRI Catalogue

M. Tajer1, 2, G. Trinchieri1, A. Wolter1, S. Campana1, A. Moretti1 and G. Tagliaferri1

1  INAF - Osservatorio Astronomico di Brera, via Brera 28, 20121 Milano, Italy
    e-mail: tajer@brera.mi.astro.it
2  Università di Milano - Bicocca, Dipartimento di Fisica, P.za della Scienza 3, 20126 Milano, Italy

(Received 23 June 2004 / Accepted 16 December 2004)

We obtained a sample of 143 normal galaxies with X-ray luminosity in the range 1038-1043 erg s-1 from the cross-correlation of the ROSAT HRI Brera Multi-scale Wavelet (BMW-HRI) Catalogue with the Lyon-Meudon Extragalactic Database (LEDA). We find that the average X-ray properties of this sample are in good agreement with those of other samples of galaxies in the literature. We selected a complete flux limited serendipitous sample of 32 galaxies from which we derived the $\log N-\log S$ distribution of normal galaxies in the flux range $1.1{-} 110 \times 10^{-14}$ erg cm-2 s-1. The resulting distribution is consistent with the Euclidean -1.5 slope. Comparisons with other samples, such as the Extended Medium Sensitivity Survey, the ROSAT All Sky Survey, the XMM-Newton/2dF survey, and the Chandra Deep Field Survey indicate that the $\log N-\log S$ distribution of normal galaxies is consistent with a Euclidean slope over a flux range of about 6 decades.

Key words: X-ray: galaxies -- galaxies: general -- surveys

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© ESO 2005