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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Osterbrock, D.E. (1986). Seyfert Galaxies in the Universe. In: Giuricin, G., Mardirossian, F., Mezzetti, M., Ramella, M. (eds) Structure and Evolution of Active Galactic Nuclei. Astrophysics and Space Science Library, vol 121. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4562-3_12
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DOI: https://doi.org/10.1007/978-94-009-4562-3_12
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