The "Edge-brightened" lobes of these structures characterize type-2 Fanaroff-Riley Objects.
The relatively random distribution of 31,000 of these astronomical objects in the 6-cm Catalogue suggests that the distribution of matter and radiation is isotropic in the largest cosmological models. Spin-flips occur when black holes within X-shaped forms of these structures undergo a collision. The "Edge-brightened" lobes of these structures characterize type-2 Fanaroff-Riley Objects. "Extended" forms of these structures show a bending sequence that ranges from linear classical doubles to nuclear emissions in one of their tails. (*) Cygnus A is an examples of these features, which, when they possess broad-lines indicates they have  a large nucleus, making them initially indistinguishable from quasars. After Karl Jansky's Very Long Array found that its jets were optically active, M87 was classified as one of these objects. For 10 points, name these galaxies which emit radiation in a relatively low-energy part of the EM spectrum.
The relatively random distribution of 31,000 of these astronomical objects in the 6-cm Catalogue suggests that the distribution of matter and radiation is isotropic in the largest cosmological models.
radio galaxy [or radio galaxies or radio sources; prompt on elliptical galaxy or elliptical galaxies] 