A&A 435, 799-810 (2005)
A sample of X-ray emitting normal galaxies from the BMW-HRI CatalogueM. 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
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 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
© ESO 2005