active galactic nucleus

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active galactic nucleus

Collins Dictionary of Astronomy © Market House Books Ltd, 2006

active galactic nucleus

[¦ak·tiv gə‚lak·tik ′nü·klē·əs]

(astronomy)

A central region of a galaxy, a light-year or less in diameter, where violent and apparently explosive behavior is observed which is manifested in many ways, including the high-velocity outflow of gas, strong nonthermal radio emission, intense and often polarized and highly variable radiation over a wide range of wavelength bands, and ejection of jets of relativistic material.

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active galaxy
AGN
ASCA
black hole
Cerenkov radiation
galactic nucleus
gamma-ray astronomy
Ginga
Hubble Space Telescope
integral
jet
Nucleus, Galactic
power-law spectrum
ultraviolet astronomy
X-ray astronomy

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