Abstract
Active galaxies are distinguished from other galaxies in that they show indications of having energy output not related to ordinary stellar processes. The activity is centered in a small nuclear region and associated with strong emission lines. The nuclei of such galaxies are named Active Galactic Nuclei (hereafter AGNs). This group of objects includes bright quasars, with luminosity exceeding 1047 erg s -1, as well as faint LINERs emitting no more than 1041 erg s -1.
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Netzer, H. (1990). AGN Emission Lines. In: Courvoisier, T.JL., Mayor, M. (eds) Active Galactic Nuclei. Saas-Fee Advanced Course 20. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-39816-6_2
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