AGN predictions for the Hubble Deep Field and the X-ray background

Details AGN predictions for the Hubble Deep Field and the X-ray background AGN predictions for the Hubble Deep Field and the X-ray background

1997-04-14

arxiv.org/abs/astro-ph/9704128v1

Astronomy and Astrophysics

Astrophysics

MNRAS Letters in press, 4 pages, 2 figures in MNRAS LaTex style. Also available at http://www.ast.cam.ac.uk/~omar/astro.html

Scientific paper

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, $\sim 10$ per cent, of the galaxies in the HDF. In contrast, normal broad line QSOs are expected to account for no more than $\sim 0.1$ per cent of the sources at these magnitudes.

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