AGN predictions for the Hubble Deep Field and the X-ray background
O. Almaini, A. C. Fabian
Abstract
We estimate the number of AGN among the galaxies in the Hubble Deep Field (HDF). The recent discovery of a class of X-ray luminous narrow emission-line galaxies has provided a possible explanation for the origin of the X-ray background (XRB), although the nature of the activity is still unresolved. By extrapolating the observed X-ray number count distribution to faint optical magnitudes we predict that this AGN population could account for a significant fraction, 10 per cent, of the galaxies in the HDF. In contrast, normal broad line QSOs are expected to account for no more than 0.1 per cent of the sources at these magnitudes.
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