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physical object > natural object > celestial body > collection of stars > galaxy > radio galaxy

radio galaxy
subject			fact

radio galaxy	has definition A galaxy that is extremely luminous at radio wavelengths. A radio galaxy is usually a giant elliptical - the largest galaxy in a cluster - and is a strong emitter of synchrotron radiation. M87 and M82 are examples.
	is a kind of galaxy
	is a kind of radio source
radio source	has wavelength radio
	is a part of celestial sphere
	has catalog radio source catalog
galaxy	has number of stars 106 to 1012
	has catalog galaxy catalog
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of radio galaxy :

• blazar (4 kinds, 14 facts) - A highly variable active galaxy which, in general, displays no emission lines in its spectrum., A term collectively used to refer to Optically Violent Variables (OVVs) and BL Lac objects.
• Broad-line radio galaxy (2 facts) (BLRG)
• core-halo galaxy (3 facts) - A class of radio source characterized by an emission "halo" surrounding a more intense "core". About 20% of the known extended radio sources are of the core-halo type.
• D galaxy (1 kind, 4 facts) - A supergiant radio galaxy (the most common type of radio galaxy) which has an elliptical nucleus surrounded by an extended envelope. Or, an optical galaxy with a very bright nucleus. In the Morgan classification, a galaxy with rotational symmetry but without pronounced spiral or elliptical structure (a dustless galaxy). In the Yerkes 1974 system a galaxy with an elliptical-like nucleus surrounded by an extensive envelope (see also R galaxy).
• double radio source (1 kind, 7 facts) - A radio galaxy, the bulk of whose radio emission comes from two sources on opposite sides of the visual galaxy. The radiation is presumably the result of an explosion in the nucleus of the parent galaxy, which caused the ejection at high speed of energetic particles in two opposite directions. About one-third of all known radio galaxies are double sources.
• Fornax A (5 facts) (NGC 1316)
• head-tail galaxy (2 facts) - A class of relatively weak radio sources associated with clusters of galaxies and characterized by a high-brightness "head" close to the optical galaxy and a long low-brightness "tail".
• Low-excitation radio galaxy (2 facts) (LERG)
• M 87 (12 facts) (3C 274, Virgo A, 2U 1228+12) - A strong radio source. Optically, it is an elliptical galaxy with a luminous blue jet about 1500 pc long. It is also one of the most powerful extragalactic sources of radiation at infrared wavelengths.
• Narrow-line radio galaxy (2 facts) (NLRG)
• NGC 1275 (11 facts) (3U 0316+41, Perseus X-1, Perseus A) - The strongest known extragalactic X-ray source. Also a strong radio source. Optically it is a Seyfert galaxy with a huge amount (about 10⁸ M_sun) of ionized gas receding from it.
• radio loud quasar (3 facts) - A quasar with detectable radio emission.
• Weak-lined radio galaxy (2 facts) (WLRG)

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