The relationship between X-ray emission and accretion in X-ray selected   AGNs
  We study the link between the X-ray emission in radio-quiet AGNs and the accretion rate on the central Supermassive Black-Hole (SMBH) using a well-defined and statistically complete sample of 70 type1 AGNs extracted from the XMM-Newton Bright Serendipitous survey (XBS). To this end, we search and quantify the statistical correlations between the main parameters that characterize the X-ray emission (i.e. the X-ray spectral slope and the X-ray loudness), and the accretion rate, both absolute and relative to the Eddington limit (Eddington ratio). Here, we summarize and discuss the main statistical correlations found and their possible implications on current disk-corona models. 
R. Fanali, A. Caccianiga, P. Severgnini, R. Della Ceca, M. Dotti, E.   Marchese, A. Corral
astro-ph.HE astro-ph.CO