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Hints on the Broad Line Region Structure of Quasars at High and Low Luminosities

Sulentic, Jack W.; Marziani, Paola; Dultzin, Deborah +2 more

Quasars show a considerable spectroscopic diversity. However, the variety of quasar spectra at low redshifts is non-random: a principal component analysis applied to large samples customarily identifies two main eigenvectors. In this contribution we show that the range of quasar optical spectral properties observed at low-z\ and associated with th…