An active galactic nucleus (AGN) is a compact region at the centre of a galaxy that has a much higher than normal luminosity over at least some portion, and possibly all, of the electromagnetic spectrum. Such excess emission has been observed in the radio, microwaves, infrared, optical, ultra-violet, X-ray and gamma ray wavebands. A galaxy hosting...
Found on
http://en.wikipedia.org/wiki/Active_galactic_nucleus
(from the article `Cosmos`) The fact that the total output from the nucleus of an active galaxy can vary by substantial factors supports the argument that the central machine is ... ...far beyond the Milky Way Galaxy system. These cosmic objects have intense clouds of radio emission that extend hundreds of thousands of ... [2 related...
Found on
http://www.britannica.com/eb/a-z/a/14
(AGN) Chandra X-ray image of Centaurus A showing a bright central source: the active galactic nucleus suspected of harboring a supermassive black hole A galactic nucleus that gives off much more energy than can be explained purely in terms of its star content. AGN are ...
Found on
http://www.daviddarling.info/encyclopedia/A/AGN.html
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