Low ionization lines in high luminosity quasars: The calcium triplet

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 $\lambda$8498, $\lambda$8542, $\lambda$8662 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 $\lambda$8446 line using the H$\beta$ profile as a model. We derive constraints on the line emitting region from the relative strength of the CaII triplet, OI $\lambda$8446 and H$\beta$.

Accepted for publication in Advances in Space Research

References in corpus (7)

• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• CIV 1549 as an Eigenvector 1 Parameter for Active Galactic Nuclei
• Stellar populations of early-type galaxies in different environments II. Ages and metallicities
• Stellar populations of early-type galaxies in different environments I. Line-strength indices
• VLT/ISAAC Spectra of the Hbeta Region in Intermediate-Redshift Quasars III. Hbeta Broad Line Profile Analysis and Inferences about BLR Structure
• Stellar populations of early-type galaxies in different environments III. Line-strength gradients
• Observations of OI and CaII Emission Lines in Quasars: Implications for the Site of FeII Line Emission