Low ionization lines in high luminosity quasars: The calcium triplet

DOI: 
10.1016/j.asr.2013.11.043
Publication date: 
01/10/2014
Main author: 
Martínez-Aldama M.L.
IAA authors: 
Sulentic J.W.
Authors: 
Martínez-Aldama M.L., Dultzin D., Marziani P., Sulentic J.W., Chen Y., Bressan A., Stirpe G.M.
Journal: 
Advances in Space Research
Publication type: 
Article
Volume: 
54
Pages: 
1375-1381
Number: 
Abstract: 
In order to investigate where and how low ionization lines are emitted in quasars we are studying a new collection of spectra of the CaII triplet at λ8498, λ8542, λ8662 observed with the Very Large Telescope (VLT) using the Infrared Spectrometer And Array Camera (ISAAC). Our sample involves luminous quasars at intermediate redshift for which CaII observations are almost nonexistent. We fit the CaII triplet and the OI λ8446 line using the Hβ profile as a model. We derive constraints on the line emitting region from the relative strength of the CaII triplet, OI λ8446 and Hβ. © 2014 Published by Elsevier Ltd.
Database: 
SCOPUS
WOK
Keywords: 
Line formation; Quasars: emission lines; Quasars: general