Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...507..747g&link_type=abstract
Astronomy and Astrophysics, Volume 507, Issue 2, 2009, pp.747-756
Astronomy and Astrophysics
Astrophysics
22
X-Rays: General, X-Rays: Diffuse Background, X-Rays: Galaxies, Infrared: Galaxies
Scientific paper
We present X-ray spectral analysis of the brightest sources (f2{-10 keV} > 10-15 erg cm-2 s-1) in the Chandra Deep Field North. Our sample consists of 222 sources; for the vast majority (171) either a spectroscopic or a photometric redshift is available. Our goal is to discover the Compton-thick AGN in a direct way i.e. through their X-ray spectra. Compton-thick AGN give away their presence in X-rays either directly through the absorption turnover redshifted in the Chandra passband, or through a flat, reflection-dominated, spectrum. The above selection criteria yield 10 Compton-thick AGN candidates of which the nine are reflection dominated. The IR or sub-mm data where available, corroborate the presence of a heavily obscured nucleus in most cases. All the five candidate Compton-thick sources with available 24 μm data present very high values of the f24/fR flux ratio suggesting that they are dust obscured galaxies. The low f_x/f_IR ratio also suggest the presence of obscured nuclei in many cases. Four of the candidate Compton-thick sources are associated with sub-mm galaxies at high redshifts z ˜ 2. The number count vs. flux distribution of the candidate Compton-thick AGN as well as their distribution with redshift agree reasonably well with the predictions of the X-ray background synthesis models of Gilli et al.
Akylas Athanassios
Georgakakis Antonis
Georgantopoulos Ioannis
Rowan-Robinson Michael
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