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Unified AGN Models - Unified AGN Models The variety of...

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Unified AGN Models The variety of classifications of AGN has led to several efforts to bring order to the field by asking whether any of these distinctions are only artifacts of how we happen to view particular objects. Two such schemes have been strongly supported by observations - the unified scheme for QSOs, radio galaxies, and BL Lac objects, and an orientation pictures for Seyfert nuclei of types 1 and 2.Both kinds of unified models are discussed at length by Antonucci (1993, ARA&A 31, 473). In the "unified scheme", broadly traceable to Blandford & Königl (1979 ApJ 232, 34), beaming and obscuration make QSOs look different from different directions. If there is an equatorial torus which is optically thick to UV and visible radiation, we won't see the central source and BLR if it's in the way, while, since so many radio-loud objects have prominent jets, Doppler beaming will make them much brighter when seen near the jet axis. This would reduce the number of different kinds of AGN by 2 or 3 (since then NLRGs, radio-loud QSOs, BL Lac
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