New local Compton-thick AGN from the deepest INTEGRAL survey

Computer Science

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Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Eso 575-G059, Ngc 4224, Igr J12080-2731, Leda 104441, 2Masx J12072798, Igr J13137-1110

Scientific paper

Accretion is recognized to play a significant role in galaxy evolution. Theory predict the existence of deeply buried AGN. The cosmic X-ray background strongly supports the existence of very absorbed, Compton-thick AGN; however, very few of them have been detected in hard X-ray surveys. We propose to observe 6 very good Compton-thick candidates detected in the deepest extragalactic survey performed by INTEGRAL. These sources have been confirmed in short Chandra observations. Their hard-to-medium X-ray flux ratios are larger by a factor 5-10 than those expected for an unabsorbed, G=1.9 power law. These observations will very strongly constrain the fraction of Compton-thick AGN at the faintest hard X-ray fluxes, making a stringent test of X-ray background synthesis models.

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