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| physical object > natural object > celestial body > collection of stars > galaxy > radio galaxy |
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| radio galaxy comparison table | |||||||||||||||||||
| Subject | has purpose | has apparent dimension | has classification criteria | is a kind of | has catalog | has classification criterion | has abundance | has acronym | has wavelength | has redshift | is an instance of | has synonym | has mass | has emission line | has luminosity | has definition | has distance | has recession velocity | has Messier number |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| blazar | radio galaxy | radio source catalog | radio | 1043 to 1046 ergs s-1 | A term collectively used to refer to Optically Violent Variables (OVVs) and BL Lac objects. | ||||||||||||||
| Broad-line radio galaxy | radio galaxy | galaxy catalog | BLRG | radio | |||||||||||||||
| core-halo galaxy | radio galaxy | galaxy catalog | 20% of the known extended radio sources | radio | 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 | radio galaxy | galaxy catalog | radio | 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 | radio galaxy | galaxy catalog | radio | 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 | galaxy catalog | radio | S0 galaxy | NGC 1316 | |||||||||||||||
| head-tail galaxy | radio galaxy | galaxy catalog | radio | 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 | radio galaxy | galaxy catalog | LERG | radio | |||||||||||||||
| M 87 | originally to catalog all objects which could be confused with a comet | E0 (spherical) to E7 (greatest eccentricity) | Messier catalog | X-ray | Messier object | Virgo X-1 | 1013 Msun (most massive galaxies known) | 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. | from Earth | 87 | |||||||||
| Narrow-line radio galaxy | radio galaxy | galaxy catalog | NLRG | radio | |||||||||||||||
| NGC 1275 | galaxy catalog | Subdivided according to the openness of the spiral arms as Sa spiral, Sb spiral or Sc spiral. | X-ray | z = 0.0183 | X-ray source | Abell 426 | 1010 to 1012 Msun | The strongest known extragalactic X-ray source. Also a strong radio source. Optically it is a Seyfert galaxy with a huge amount (about 108 Msun) of ionized gas receding from it. | 5000 km s-1 | ||||||||||
| radio loud quasar | radio galaxy | quasar catalog | QSO | radio | large | exploding galaxy | very large | A quasar with detectable radio emission. | |||||||||||
| Weak-lined radio galaxy | radio galaxy | galaxy catalog | WLRG | radio |
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