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...Galaxies Catalogue|PGC]] 62756, [[Catalogue of Galaxies and of Clusters of Galaxies|CGCG]] 229-015, KIC 006932990, 2PBC J1905.3+4232}} ...agencies as hosting an [[active galactic nucleus]], a [[quasar]], and a [[Seyfert galaxy]], each of which overlap in some way. ...

...lines in the [[infrared]] range, e.g. in several [[Seyfert galaxy|Seyfert galaxies]].<ref name = Hoenig2008/> ...ce of the presence of massive [[accretion disk]]s in the centres of active galaxies and quasars.<ref name = Netzer1985/> However, a complete explanation is sti ...

...p (also known as [[Lyons_Groups_of_Galaxies|LGG]] 33), which contains four galaxies, including [[NGC 701]] and [[IC 1738]].<ref>{{cite journal | bibcode=1993A& The [[SIMBAD]] database lists NGC{{nbsp}}681 as a [[Seyfert_galaxy|Seyfert]] II Galaxy, i.e. it has a [[quasar]]-like nucleus with very high surface b ...

...ed in the context of binary [[supermassive black hole]]s at the centers of galaxies.<ref name=DM>[[David Merritt|Merritt, D.]] (2002), [http://adsabs.harvard.e Rotational Brownian motion is often observed in [[N-body simulation]]s of [[galaxies]] containing binary black holes.<ref>Löckmann, U. and Baumgardt, H. (2008), ...

...Tidal disruption of stars by black holes of 106–108 solar masses in nearby galaxies |journal=Nature |language=en |volume=333 |issue=6173 |pages=523–528 |bibcod ...the central black hole mass; it can approach or exceed that of their host galaxies, making them some of the brightest sources observed in the Universe.<ref>{{ ...