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Spectropolarimetry and Variability of Seyfert 1.8 and 1.9 Galaxies

Published online by Cambridge University Press:  07 August 2017

Robert W. Goodrich
Robert W. Goodrich*
Affiliation:
Lick Observatory, University of California, Santa Cruz, CA 95064, USA

Extract

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Twelve AGN classified as Seyfert 1.8s or 1.9s were observed with a CCD spectropolarimeter on the 3-m Shane telescope on Mount Hamilton. The instrument and data reduction procedures are described in Miller, Robinson, and Goodrich (1988). Three of the objects (NGC 2622, NGC 7603, and Mrk 1018) have undergone extreme variability, at times being classified as Seyfert 1.8s or 1.9s and at other times having spectra classifiable as Seyfert 1s. A set of IDS data on these three objects was generously provided by D. E. Osterbrock and collaborators, and allows comparison of the spectra in the “low state” (i.e. Seyfert 1.8 or 1.9) and the “high state” (Seyfert 1 spectrum).

Type
Part 2: BLR and Variability
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 103 - 105
Copyright
Copyright © Kluwer 1989 

References

Miller, J. S., Robinson, L. B., and Goodrich, R. W. 1988, in Instrumentation for Ground-Based Astronomy, ed. Robinson, L. B. (Springer Verlag:New York).Google Scholar
Peterson, B. M. 1987, Ap. J., 312, 79.Google Scholar
Stirpe, G. M., de Bruyn, A. G., and van Groningen, E. 1988, Astr. Ap., in press.Google Scholar