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Exploring (extremely) obscured accretion

AuthorsCarrera, Francisco J. CSIC ORCID CVN ; Mateos, Silvia CSIC ORCID ; Della Ceca, R.; Caccianiga, A.; Corral, Amalia CSIC ORCID ; Severgnini, P.; Moro, A. del
Issue Date2011
CitationX-ray Universe (2011)
AbstractMost accretion in the Universe is thought to occur in obscured enviroments. Many different techniques are used to select obscured AGN. We present here the results of a selection of obscured AGN using their X-ray to optical flux ratio. Despite choosing a relatively high X-ray flux limit, most sources turn out to be only identifiable through 10 m-class spectroscopy. We have identified 22 sources (18 using GTC). Among the identified sources there are broad-line AGN (BLAGN), narrow emission line galaxies, and “normal galaxies”. 11 of those 17 turn out to be high-luminosity highly-absorbed AGN (the so-called QSO2). The two highest luminosity BLAGN are super-Eddington sources, while the third one appears to be a transition object between a type 2 and a type 1. This method appears to be quite efficient in selecting QSO2, but not more highly obscured sources, such as the long-sought Compton-Thick AGN.
DescriptionTrabajo presentado al Congreso X-ray Universe, celebrado en Berlin el 30 de junio de 2011.
Appears in Collections:(IFCA) Comunicaciones congresos

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