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NGC 4151: An Accurate Upper Limit to the Dimensions of the Central Continuum Source?

Published online by Cambridge University Press:  19 July 2016

Nicolaos H. Solomos
Nicolaos H. Solomos*
Affiliation:
Physics Dept., Hellenic Naval Academy, Piraeus- 17503, Greece

Abstract

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Simultaneous (5672 Å and 3400–3900 Å)) optical continuum photometric observations of the Seyfert galaxy NGC4151, were carried out within ≤4 week periods, down to a time resolution of < 1hr. A new active phase (1990) is detected with onset and slope captured in 1989. Implications of the variability record from 1983, to 1990 (Fig-1), are discussed.

Type
Poster Contributions: Variability
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 405 - 406
Copyright
Copyright © Kluwer 1994 

References

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4. Ulrich, M. (1991): in ‘Variability of Active Galaxies’, Eds. Duschl, W.J. et. al., LNP Vol. 377, Heidelberg.Google Scholar