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The spectra of narrow-line Seyfert 1 galaxies
Osterbrock, D. E.; Pogge, R. W.
AA(Lick Observatory, Santa Cruz, CA), AB(Lick Observatory, Santa Cruz, CA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 1, 1985, p. 166-176. (ApJ Homepage)
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NASA/STI Keywords:
Astronomical Spectroscopy, Galactic Nuclei, Seyfert Galaxies, Abundance, Active Galactic Nuclei, Emission Spectra, H Beta Line, Hydrogen Ions, Iron, Luminosity, Spectral Energy Distribution, Spectral Line Width
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Measurements are presented of a group of active galactic nuclei with all the properties of Seyfert 1 or 1.5 galaxies, but with unusually narrow H I lines. They include Mrk 42, 359, and 1239 as well as Mrk 493, 766, 783, and 1126. One other somewhat similar object, Mrk 1388, is also included in the discussion. For these objects, narrow-line widths and intensities of the emission lines are discussed. Overall, these narrow-line Seyfert 1 galaxies show a wide variety of deviations from the properties of typical Seyfert 1 objects. They clearly demonstrate that the Seyfert phenomenon is not a simple one-parameter effect.

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