Abstract
Active Galactic Nuclei (AGN) is a common name for quasars, Seyfert galaxies, liners, BL Lac objects and some narrow emission line galaxies. They show energy output not usually associated with stellar processes which is centered in a small nuclear region. An extragalactic object is classified as AGN if at least one of the following criteria is fulfilled: a. Compact nuclear region brighter than the corresponding region in galaxies of similar type. b. Nonstellar (or nonthermal) nuclear continuum emission. c. Nuclear emission lines indicating non-stellar excitation mechanism. d. Variable continuum and/or emission lines.
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