282 citations · 1.3k across the 39 of their papers we have counts for
6 papers · 1 filter
Preliminary cosmological results using extreme accretors Quasar formalism
Rodrigo Sandoval-Orozco, Castalia Alenka Negrete, Paola Marziani +1
We revisited the xA Quasar formalism from the cosmological point of view, where a completely cleaned and standardized sample is compiled from different literature references. This…
Extreme quasars as distance indicators in cosmology
D. Dultzin, P. Marziani, J. A. de Diego +7
Quasars accreting matter at very high rates (known as extreme Population A [xA] quasars, possibly associated with super-Eddington accreting massive black holes) may provide a new c…
Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars
C. Alenka Negrete, Deborah Dultzin, Paola Marziani +1
Black Hole Mass (M_BH) estimation in quasars, especially at high redshift, involves use of single epoch spectra with s/n and resolution that permit accurate measurement of the widt…
BLR Physical Conditions in Extreme Population A Quasars: a Method to Estimate Central Black Hole Mass at High Redshift
Alenka Negrete, Deborah Dultzin, Paola Marziani +1
We describe a method for determination of physical conditions in the broad line regions of a significant subsample of Seyfert-1 nuclei and quasars. Several diagnostic ratios based…
Physical Conditions in the Broad Line Region of Quasars: A Photoionization Method to Derive
C. Alenka Negrete, Deborah Dultzin, Paola Marziani +1
We present high S/N UV spectra for eight quasars at \ obtained with VLT/FORS. The spectra enable us to analyze in detail the strongest emission features in the rest-frame r…
Broad Line Region Physical Conditions along the Quasar Eigenvector 1 Sequence
P. Marziani, J. W. Sulentic, C. A. Negrete +3
[Abridged] We compare broad emission line profiles and estimate line ratios for all major emission lines between Ly-alpha and H-beta in a sample of six quasars. The sources were ch…