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Seyfert Galaxies in the Universe

  • Donald E. Osterbrock
Part of the Astrophysics and Space Science Library book series (ASSL, volume 121)

Abstract

Recent optical spectroscopy of Seyfert galaxies, particularly at Lick Observatory, is discussed. The frame of reference is the luminosity function of Seyfert galaxies, the incompleteness of available surveys, and how complete samples can be found by combining several different types of surveys. The importance of spectral classification, or differentiating between various classes of active galactic nuclei, is stressed. All Seyfert galaxies and AGNs cannot be fitted into a single one-parameter sequence. Starburst galaxies and LINERs are briefly discussed. At the end some recent results on the frequencies of Seyfert galaxies with companions and in interacting systems are briefly summarized.

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Copyright information

© Springer Science+Business Media Dordrecht 1986

Authors and Affiliations

  • Donald E. Osterbrock
    • 1
  1. 1.Lick Observatory, Board of Studies in Astronomy and AstrophysicsUniversity of CaliforniaSanta CruzUSA

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