active galactic nucleus

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active galactic nucleus (

See under galactic nucleus.

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active galaxy
AGN
BL Lac object
blazar

galactic nucleus
radio galaxy
x-ray astronomy

Jaffe of the State University of Leiden in the Netherlands, the Hubble image provides the closest look yet at the center of a type of galaxy -- called an active galactic nucleus (AGN) -- that has a luminous, energetic core.

Orbiting Hubble eyes active galaxy's disk by Cowen, Ron / Science News

According to Begelman's theoretical analysis, each of these disk configurations can develop out of different initial conditions, and it may be the disk configuration that determines what kind of active galactic nucleus we see in a given instance.

Getting to the bottom of supermassive black holes by Thomsen, Dietrich E. / Science News

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