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Low ionization lines in high luminosity quasars: The calcium triplet |
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| Authors: | Mary Loli Martínez-Aldama Deborah Dultzin Paola Marziani Jack W Sulentic Yang Chen Alessandro Bressan Giovanna M Stirpe |
| Institution: | 1. Instituto de Astronomía, Universidad Nacional Autónoma de México, Aptdo. Postal 70-264, México, D. F. 04510, Mexico;2. INAF, Osservatorio Astronomico di Padova, Vicolo dell Osservatorio 5, 35122 Padova, Italy;3. Instituto de Astronomía de Andalucía (CSIC), C/ Camino Bajo de Huétor 50, 18008 Granada, Spain;4. Scuola Internazionale Superiore di Studi Avanzati (SISSA), via Bonomea 265, I-34136 Trieste, Italy;5. INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy |
| 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. |
| Keywords: | Line formation Quasars: general Quasars: emission lines |
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