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active galaxy

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.02 sec.
active galaxy [′ak·tiv ′gal·ək·sē]
(astronomy)
A galaxy whose central region exhibits strong emission activity, from radio to x-ray frequencies, probably as a result of gravitational collapse; this category includes M82 galaxies, Seyfert galaxies, N galaxies, and possibly quasars.


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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.
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.
 
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