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Although absorbed quasars are extremely important for our understanding ofthe energetics of the Universe, the main physical parameters of their centralengines are still poorly known. In this work we present and study a completesample of 14 quasars (QSOs) that are absorbed in the X-rays (column densityNH>4x10^21 cm-2 and X-ray luminosity L(2-10 keV)>10^44 ergs/s; XQSO2) belongingto the XMM-Newton Bright Serendipitous Survey (XBS). From the analysis of theirultraviolet-to-mid-infrared spectral energy distribution we can separate thenuclear emission from the host galaxy contribution, obtaining a measurement ofthe fundamental nuclear parameters, like the mass of the central supermassiveblack hole and the value of Eddington ratio, lambda_Edd. Comparing theproperties of XQSO2s with those previously obtained for the X-ray unabsorbedQSOs in the XBS, we do not find any evidence that the two samples are drawnfrom different populations. In particular, the two samples span the same rangein Eddington ratios, up to lambda_Edd=0.5; this implies that our XQSO2spopulate the "forbidden region" in the so-called "effective Eddington limitparadigm". A combination of low grain abundance, presence of stars inwards ofthe absorber, and/or anisotropy of the disk emission, can explain this result.

The XMM-Newton Bright Survey sample of absorbed quasars: X-ray and accretion properties