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Shocks and Photoionization in the Narrow-Line Region

Published online by Cambridge University Press:  12 April 2016

Sueli M. Viegas  and
Marcella Contini
Sueli M. Viegas
Affiliation:
Instituto Astronômico e Geofísico, USP, São Paulo, Brazil
Marcella Contini
Affiliation:
School of Physics and Astronomy, Tel-Aviv University, Ramat-Aviv, Tel-Aviv, Israel

Abstract

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The presence of shocked regions in the narrow-line region (NLR) of active galactic nuclei (AGN) is discussed. Their effect on the physical conditions, in addition to photoionization from the central radiation source, is analyzed. We show that composite models, accounting for both shocks and photoionization, provide a consistent picture of the NLR which accounts for the observed emission-line and continuum spectra and is in agreement with the AGN unified model. The study of a particular object, NGC 5252, strengthens these results. It also shows that, besides explaining the observational data, the models make predictions that can be tested by infrared, optical, and X-ray imaging.

Type
VII. Shocks and Photoionization
Information
International Astronomical Union Colloquium , Volume 159: Emission Lines in Active Galaxies: New Methods and Techniques , 1997 , pp. 365 - 377
Copyright
Copyright © Astronomical Society of the Pacific 1997

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