PoS - Proceedings of Science
Volume 371 - 7th Annual Conference on High Energy Astrophysics in Southern Africa (HEASA2019) - AGN II (Chair: Eli Kasai)
The optical and X-ray properties of a sample of Seyfert galaxies that have undergone significant spectral change
D.T.M. Makope,* H. Winkler, F. van Wyk
*corresponding author
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Pre-published on: December 22, 2020
Published on:
Abstract
This paper presents the initial findings of a study of the optical spectra of two sets of data for about 50 Seyfert galaxies taken 20 years apart. We compared the spectra for the different epochs and identify some objects where significant spectral changes occurred. We describe the nature of the spectral changes and collate available information about the x-ray properties of these AGN. In particular, we probe whether the degree of spectral variability, which may range from relatively steady to “changing look” AGN, correlates with any x-ray features. We attempt to interpret our findings in terms of possible physical models of these AGN.
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