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

Abstract

We have obtained a sample of 143 normal galaxies with X-ray luminosity in the range $10^{38}-10^{43}$ 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 have selected a complete flux limited serendipitous sample of 32 galaxies from which we have derived the logN-logS 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 logN-logS distribution of normal galaxies is consistent with an euclidean slope over a flux range of about 6 decades.

arXiv commentAccepted for publication in A&A. 19 pages, 7 figures. Full resolution version of Figure 2 is available at http://www.brera.mi.astro.it/~tajer/

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