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. Tajer^{1, 2}, G. Trinchieri¹, A. Wolter¹, S. Campana¹, A. Moretti¹ and G. Tagliaferri<sup>1

1</sup>  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)

Abstract
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 distribution of normal galaxies in the flux range  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 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

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