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Activity in the Nuclei of Seyfert Galaxies in the Visual and Infrared

Published online by Cambridge University Press:  14 August 2015

A. G. Pacholczyk
A. G. Pacholczyk*
Affiliation:
Steward Observatory, Tucson, Ariz., U.S.A.

Abstract

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This paper reports (1) a possible 5.1 yr period in the optical variations of the nucleus of NGC 4151; and (2) variations with a time-scale of a few days in the 2.2 micron flux density of NGC 1068, implying that the size of the infrared emitting region is not larger than a few times 1015 cm.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 44: External Galaxies and Quasi-Stellar Objects , 1972 , pp. 165 - 170
Copyright
Copyright © Reidel 1972 

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