(a classification of the radio characteristics of radio sources)
The Fanaroff-Riley classification (FR classification)
is a classification of radio sources intended to distinguish
radio galaxy with lobes from active galactic nuclei.
- Class FR-I - luminosity decreases from a central point.
- Class FR-II - luminosity increases from a central point.
The first appears to be an AGN, the second, a radio galaxy
with lobes (regions away from the center emitting much
of the radio electromagnetic radiation).