active galactic nucleus


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active galactic nucleus

n.
A galactic nucleus that emits more radiation than can be accounted for solely by light from the stars it contains.
References in periodicals archive ?
This result is crucial in order to understand how an active galactic nucleus influences the surrounding galaxy," says Schawinski, who led the study.
2005) The luminosity dependence of the type 1 active galactic nucleus fraction.
Other observations have revealed that NGC 4945 has an active galactic nucleus, meaning its central bulge emits far more energy than calmer galaxies like the Milky Way.
Any bright galactic core not powered by starlight is known as an active galactic nucleus.
04021) a study  accepted for publication in the Astrophysical Journal, could be outflows from an active galactic nucleus (AGN) - which is itself being powered by a supermassive black hole.
Barro's team found X-ray evidence for an active galactic nucleus (AGN) in 7 of the 13 galaxies it studied, while Nelson's team saw no sign of an AGN in the galaxy it analyzed.
The resolution at which they were able to observe this highly luminescent active galactic nucleus (AGN) has given them direct confirmation of how mass accretes onto black holes in centres of galaxies.
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.
On July 3rd in Nature, astronomers reported that the double ACN SDSS J1502+1115 is actually a highly compact triple active galactic nucleus (ACN).