So-called "grand unified theories" of these things hypothesize that all classes of them are the same kind of object viewed at different angles.
Energy and momentum driven outflows are two models of regulatory feedback from these entities. Emission lines of low ionization atoms like [NII] ["N Two"] and [OI] ["O One"] define objects that might indicate star formation or the LINER class of these objects. So-called "grand unified theories" of these things hypothesize that all classes of them are the same kind of object viewed at different angles. Synchotron emission that appears to be (*) faster than light occurs due to relativistic beaming in the jets that flow of of the accretion disks central to these objects. These objects are divided into radio- loud and radio-quiet classes, and subtypes of these objects include BL Lac, Seyfert galaxies, Blazars, and Quasars and they are divided into Radio Loud and Radio Quiet classes. For 10 points, name these incredibly bright regions in the center of galaxies which surround supermassive black holes.
Energy and momentum driven outflows are two models of regulatory feedback from these entities.
Active Galactic Nuclei [antiprompt on any subclass before read including LINER, BL Lac, Seyfert galaxy, Blazar, and Quasar, prompt on Supermassive Black Hole]