On the faint end of the high redshift AGN luminosity function

Details On the faint end of the high redshift AGN luminosity function On the faint end of the high redshift AGN luminosity function

2007-01-18

arxiv.org/abs/astro-ph/0701515v2

Astrophys.J.660:1051-1059,2007

Astronomy and Astrophysics

Astrophysics

19 pages, 5 figures, revised version for ApJ

Scientific paper

10.1086/512845

Using the results of recent optical surveys we conclude that the {\it non}-detection of quasars down to faint magnitudes implies a significant flattening of the high redshift (z~6) optical active galactic nuclei (AGN) luminosity function for M_{1450}>-24.7. We find that all the data are consistent with a faint-end slope for the optical AGN luminosity function of \beta=-2.2 and \beta=-2.8, at the 90% and 99% confidence level respectively, flatter than the bright-end slope of \beta'~ -3.2. We also show that X-ray deep surveys have probed even fainter magnitudes than the optical ones yielding more significant constraints on the shallow faint-end slope of the optical luminosity function. The inclusion of Type II AGN candidates, detected in the Chandra deep fields, hints towards an higher normalization for the total AGN luminosity function, if these sources lie at 5

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