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High metal content of highly accreting quasars
Marzena Śniegowska, Paola Marziani, Bożena Czerny +4
We present an analysis of UV spectra of 13 quasars believed to belong to extreme Population A (xA) quasars, aimed at the estimation of the chemical abundances of the broad line emi…
Optical spectral properties of radio loud quasars along the main sequence
A. del Olmo, P. Marziani, V. Ganci +4
We analyze the optical properties of Radio-Loud quasars along the Main Sequence (MS) of quasars. A sample of 355 quasars selected on the basis of radio detection was obtained by cr…
Dichotomy of radio loud and radio quiet quasars in four dimensional eigenvector one (4DE1) parameter space
Shimeles Terefe, Ascensión Del Olmo Orozco, Paola Marziani +1
Recent work has shown that it is possible to systematize quasars (QSOs) spectral diversity in 4DE1 parameter space. The spectra contained in most of the surveys have low signal to…
Optical Spectroscopy of nearby type1-LINERs
S. Cazzoli, I. Márquez, J. Masegosa +6
We present the highlights from our recent study of 22 local (z0.025) type-1 LINERs from the Palomar Survey, on the basis of optical long-slit spectroscopic observations taken wi…
The quasar main sequence and its potential for cosmology
P. Marziani, D. Dultzin, A. Del Olmo +10
The main sequence offers a method for the systematization of quasar spectral properties. Extreme FeII emitters (or extreme Population A, xA) are believed to be sources accreting ma…