Faint high-redshift AGN in the Chandra Deep Field South: the evolution of the AGN luminosity function and black hole demography - INSPIRE

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Faint high-redshift AGN in the Chandra Deep Field South: the evolution of the AGN luminosity function and black hole demography

Sep, 2011

23 pages

Published in:

Astron.Astrophys. 537 (2012) A16

e-Print:

1109.2888 [astro-ph.CO]

DOI:

10.1051/0004-6361/201117581

View in:

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Abstract: (arXiv)

We present detection and analysis of faint X-ray sources in the Chandra deep field south (CDFS) using the 4 Msec Chandra observation and adopting a new detection algorithm, based on a targeted search at the position of known high-z galaxies. This optimized technique results in the identification of 54 z>3 AGNs, 29 of which are new detections. Applying stringent completeness criteria, we derive AGN luminosity functions in the redshift bins 3-4, 4-5 and >5.8 and for 42.753 (18+17-10%). Their optical counterparts are not strongly reddened and we thus conclude that the size of the X-ray absorber is likely smaller than the dust sublimation radius. We finally report the discovery of a highly star-forming galaxy at z=3.47. If confirmed, this would be one of the farthest objects in which stellar sources are detected in X-rays.

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A&A in press

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