Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-25
Astronomy and Astrophysics
Astrophysics
29 pages, 13 figures. Accepted for publication in Astronomy & Astrophysics. Full resolution preprint available at the CDF-S we
Scientific paper
10.1051/0004-6361:20041212
We provide important new constraints on the nature and redshift distribution of optically faint (R>25) X-ray sources in the Chandra Deep Field South Survey. We show that we can derive accurate photometric redshifts for the spectroscopically unidentified sources thus maximizing the redshift completeness for the whole X-ray sample. Our new redshift distribution for the X-ray source population is in better agreement with that predicted by X-ray background synthesis models; however, we still find an overdensity of low redshift (z<1) sources. The optically faint sources are mainly X-ray absorbed AGN, as determined from direct X-ray spectral analysis and other diagnostics. Many of these optically faint sources have high (>10) X-ray-to-optical flux ratios. We also find that ~71% of them are well fitted with the SED of an early-type galaxy with
Alexander Dave M.
Bergeron Jacqueline
Gilli Roberto
Hasinger Guenter
Idzi Rafal
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