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active galaxy
noun
- a galaxy that emits usually large amounts of energy from a very compact central source, such as Seyfert galaxies, radio galaxies, and quasars Also calledactive galactic nucleus
active galaxy
- A galaxy emitting unusually high quantities of radiation from an active galactic nucleus at its center. Some active galaxies emit more energy in radio wavelengths than they do visible light. Seyfert galaxies are examples of active galaxies.
- See more at galactic nucleus
Example Sentences
NGC 4945 is an active galaxy about 13 million light-years away in the southern constellation Centaurus.
An active galaxy has an unusually bright and variable center powered by a supermassive black hole that heats a surrounding disk of gas and dust through gravitational and frictional forces.
The detection of neutrinos ostensibly coming from this active galaxy is a big deal.
TXS 0128+554 is considered an active galaxy, as it emits more light than all of its stars together.
One of the study's co-authors, Magda Guglielmo from the University of Sydney, said the findings "dramatically change our understanding of the Milky Way," leading researchers to believe that the Milky Way is an active galaxy, not an inactive one.
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