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X-ray view of four high-luminosity Swift/BAT AGN: Unveiling obscuration and reflection with Suzaku

Aims. A complete census of obscured active galactic nuclei (AGN) is necessary to reveal the history of the super massive black hole (SMBH) growth and galaxy evolution in the Universe given the complex feedback processes and the fact that much of this growth occurs in an obscured phase. In this context, hard X-ray surveys and dedicated follow-up observations represent a unique tool for selecting highly absorbed AGN and for characterizing the obscuring matter surrounding the SMBH. Here we focus on the absorption and reflection occurring in highly luminous, quasar-like AGN, to study the relation between the geometry of the absorbing matter and the AGN nature (e.g. X-ray, optical, and radio properties), and to help to determine the column density dependency on the AGN luminosity. Methods. The Swift/BAT nine-month survey observed 153 AGN, all with ultra-hard X-ray BAT fluxes in excess of 10 −11 ergcm −2 s −1 and an average redshift of 0.03. Among them, four of the most luminous BAT AGN (44.73 100) X-to-[OIII] luminosity ratios, with an extreme value of R X ∼ 800 for 3C452, confirming the [OIII] luminosity to be affected by residual extinction in presence of mild absorption, especially for “buried” AGN such as 3C452. Three of our targets are powerful FRII radio galaxies, which is shown by their high luminosity and absorption; this makes them the most luminous and absorbed AGN of the BAT Seyfert survey despite the inversely proportional NH − LX relation.