Spectroscopic Analysis of High Luminous Quasars

We present two lines of our recent research on high luminosity quasars. Our analysis is based on the 4 Dimensional Eigenvector 1 (4DE1) formalism, which distinguish and unify type 1 quasar diversity. We focus on: (1) Our recent results from the analysis of CIV1549 line profiles for a sample of radio-quiet extreme luminosity quasars (log L = 47-48.5) for which we also had previous IR observations covering the Hbeta region that allow us to estimate black hole mass, Eddington ratio and accurate source rest frame, an invaluable input for CIV studies. We find high CIV blueshifts, interpreted as signatures of strong outflow, in most sources. Quasars radiating close to the Eddington limit show blueshifts as large as -6000 km/s. We find evidence for a strong correlation between CIV blueshift amplitude and Eddington ratio, with a weaker trend with source luminosity. (2) First results from the spectroscopic analysis of a sample of 50 type I highly accreting quasars (L/LEdd ~ 1) at redshift 2-4. They were observed with the OSIRIS spectrograph at the GTC. Kinematical and physical properties of the broad line region are derived by fitting the profiles of strong UV emission lines. The importance of highly accreting quasars goes beyond the understanding of the details of their physics as their high Eddington ratio make them candidates to be standard candles for cosmological probes