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The Compton-thick AGN fraction from the deepest X-ray spectroscopy in the CDF-S

AuthorsCorral, Amalia
Issue Date2017
CitationSpanish X-Ray Astronomy (2017)
AbstractHighly obscured AGN, especially Compton-thick (CT) AGN, likely play a key role in the galaxy-AGN co-evolution scenario. They would comprise the early stages of AGN activity, preceding the AGN-feedback/star-formation quenching phase, during which most of both the SMBH and galaxy growth take place. However, the actual CT fraction among the AGN population is still largely unconstrained. The most reliable way of confirming the obscured nature of an AGN is by X-ray spectroscopy, but very deep observations are needed to extend local analyses to larger distances. We will present the X- ray spectral analysis of the deepest X-ray data obtained to date, the almost 7Ms observation of the Chandra Deep Field South. The unprecedented depth of this survey allow us to carry out reliable spectral analyses down to faint fluxes in the hard 2-8 keV band. Besides the new deeper X-ray data, our approach also includes the implementation of Bayesian inference in the determination of the CT fraction. Our results favor X-ray background synthesis models which postulate a moderate fraction (25 W) of CT objects among the obscured AGN population. We also tested, by using simulations, how the spectral quality and the selection technique of CT candidates may affect these results.
DescriptionResumen del trabajo presentado al Spanish X-ray Astronomy 2017: the path towards Athena, celebrado en Granada del 23 al 25 de octubre de 2017.
Appears in Collections:(IFCA) Comunicaciones congresos
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