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Physical Properties of the Extranuclear Emitting Regions in Irregular and Interacting AGNs

Published online by Cambridge University Press:  07 August 2017

P. Rafanelli
P. Rafanelli*
Affiliation:
Department of Astronomy, University of Padova, Padova, Italy

Abstract

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CCD slit spectra have been obtained at Lick Observatory of a sample of fourteen close interacting and irregular Seyfert galaxies. The spectra of the extranuclear emitting regions have been investigated and classified using the quantitative criteria recommended by Veilleux and Osterbrock to distinguish objects photoionized by thermal sources from objects photoionized by a “power law” continuum. From our data it results that four out of the twenty emitting regions identified are typical H II regions, while eight have spectra photoionized by a hard-photon spectrum. Seven regions show a twofold behavior which is interpreted in terms of a combination of photoionization, shock heating and scattering of light by dust.

Type
Part 8: Relationships of Nucleus, Galaxy and Environment
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 478 - 479
Copyright
Copyright © Kluwer 1989 

References

Shull, J.M. and McKee, C.F. 1979, Ap. J., 227, 131 Google Scholar
Veilleux, S., and Osterbrock, D.E. 1987, Ap. J. Suppl., 63, 295 CrossRefGoogle Scholar