Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..190g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 1, 1989, p. 190-202. Research supported by NASA and Achievements R
Astronomy and Astrophysics
Astronomy
86
Active Galactic Nuclei, Astronomical Spectroscopy, Polarimetry, Seyfert Galaxies, Forbidden Transitions, H Alpha Line, H Beta Line, Infrared Astronomy Satellite, Interstellar Extinction, Optical Thickness
Scientific paper
The phenomenon which produces the spectra classified as Seyfert 1.8 or 1.9 is investigated through CCD spectropolarimetry and through analysis of three highly variable objects. The Seyfert 1.9 galaxy IRAS 1958-183 has a highly polarized continuum and a broad H-alpha line which is 30 percent polarized. The variability of NGC 2622, NGC 7603 (= Mrk 530), and Mrk 1018 are studied. The changes in flux of the broad lines and the continuum near H-alpha and H-beta are consistent with changes in the extinction in all cases. Improved IRAS photometry supports the conclusion that most Seyfert 1.8s and 1.9s are normal Seyfert 1s seen through a screen of dust located in or just outside of the broad-line regions. Variability is due to changes in the optical depth of this screen.
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