active nucleus of galaxy

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• galaxy — /gal euhk see/, n., pl. galaxies. 1. Astron. a. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. b. (usually cap.) See Milky Way. 2. any large and brilliant or impressive… …   Universalium

• Galaxy — This article is about the astronomical structure. For other uses, see Galaxy (disambiguation). NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 55,000 light years in diameter and approximately 60 million light… …   Wikipedia

• Active galactic nucleus — An active galactic nucleus (AGN) is a compact region at the centre of a galaxy which has a much higher than normal luminosity over some or all of the electromagnetic spectrum (in the radio, infrared, optical, ultra violet, X ray and/or gamma ray… …   Wikipedia

• Galaxy AGN classification — or galaxy active galactic nucleus classification is classification of galaxies with active galactic nuclei (AGN) in astronomy.There are two main types of AGNs, Radio quiet and Radio loud, which are each broken up into further sub types.* Radio… …   Wikipedia

• Galaxy classification — is classification by means of and for the discipline of astronomy.* galaxy morphological classification * galaxy AGN classification (galaxy active galactic nucleus classification)There are three main types of Galaxies, barred Spiral, Spiral, and… …   Wikipedia

• active galactic nucleus — Small region at the centre of a galaxy that emits a prodigious amount of energy in the form of radio, optical, X ray, or gamma radiation or high speed particle jets. Many classes of active galaxies have been identified; they appear similar in… …   Universalium

• Galaxy morphological classification — Artist s concept illustrating bulge no bulge spiral galaxies. Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance. There are several schemes in use by which galaxies… …   Wikipedia

• Radio galaxy — Radio galaxies and their relatives, radio loud quasars and blazars, are types of active galaxy that are very luminous at radio wavelengths (up to 1038 W between 10 MHz and 100 GHz). The radio emission is due to the synchrotron process. The… …   Wikipedia

• Seyfert Galaxy —    Any of a class of spiral galaxies with a small, yet very active, nucleus. See Active Galactic Nucleus …   The writer's dictionary of science fiction, fantasy, horror and mythology

• Sombrero Galaxy — For other uses, see M104 (disambiguation). Sombrero Galaxy[1][2] …   Wikipedia

• Andromeda Galaxy — The Andromeda Galax …   Wikipedia