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Calcium Infrared Triplet Emission in AGN

Published online by Cambridge University Press:  07 August 2017

S. E. Persson  and
G. J. Ferland
S. E. Persson
Affiliation:
Mt. Wilson and Las Campanas Observatories, 813 Santa Barbara St., Pasadena, CA 91101
G. J. Ferland
Affiliation:
Dept. of Astronomy, Ohio State University, Columbus, OH 43210

Abstract

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Emission in the Ca II infrared triplet lines has been detected in 15 AGN. Correlations with optical Fe II emission and O I λ8446 linewidths indicate that Ca II emission comes from neutral gas within the BLR. A new series of ionization models that extend to column densities NH of 1025 cm−2 match the Ca II line strengths and various line ratios. The solution to the Ca II problem, which also solves the “Fe II problem” and the “energy puzzle”, is that a small amount of H− dominates the heating, even for NH ∼1022 cm−2, by absorbing the powerful near-infrared (1 μm) continuum.

Type
Part 5: Structure of the Central Object and NLR
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 293 - 295
Copyright
Copyright © Kluwer 1989 

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