Fanaroff-Riley Type II
Fanaroff-Riley Type II (FR II) refers to a classification of radio galaxies based on their radio emission characteristics. These galaxies are characterized by powerful jets that extend far beyond the host galaxy, creating large lobes of radio emission. The jets are typically one-sided, indicating that they are directed away from the observer.
FR II galaxies are often associated with active galactic nuclei (AGN) and are found in regions of high galaxy density. They are distinguished from Fanaroff-Riley Type I (FR I) galaxies, which have weaker jets and more diffuse radio emissions. The study of FR II galaxies helps astronomers understand the processes of galaxy evolution and the role of supermassive black holes.