Hints on the Broad Line Region Structure of Quasars at High and Low Luminosities
Sulentic, Jack W.; Marziani, Paola; Dultzin, Deborah; Negrete, C. A.; Zamfir, Sebastian
Italy, Spain, United States, Mexico
Abstract
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 the first eigenvector is preserved up to z ≈ 2 in a sample of high luminosity quasars. We also describe two major luminosity effects.