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active galaxy

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active galaxy

In astronomy, type of galaxy that emits vast quantities of energy from a small region at its centre, the active galactic nucleus (AGN). Active galaxies are subdivided into radio galaxies, Seyfert galaxies, BL Lacertae objects, and quasars.

Active galaxies are thought to contain black holes with a mass 108 times that of the Sun, drawing stars and interstellar gas towards them in a process of accretion. The gravitational energy released by the in-falling material is the power source for the AGN. Some of the energy may appear as a pair of opposed jets emerging from the nucleus. The orientation of the jets to the line of sight and their interaction with surrounding material determines the type of active galaxy that is seen by observers. See also starburst galaxy.
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? Mentioned in ? References in periodicals archive
 
The investigators hope to detect high-energy neutrinos released in astrophysical events such as the cataclysmic gravitational collapse of a star or the accretion of matter in the massive core of an active galaxy.
Putting neutrino detection on ice by Science News
And when the galaxy is the nearest active galaxy to us, Centaurus A, which also happens to be one of the strongest and longest studied celestial sources of radio waves, the combination provides a rather unique excitement for astronomers.
Serendipity: supernova in Centaurus A by Thomsen, Dietrick E. / Science News
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