active galaxy


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active galaxy

n.
A galaxy that is many times brighter than other galaxies of the same type. Active galaxies commonly emit most of their excess luminosity from a compact active galactic nucleus.

active galaxy

n
(Astronomy) a galaxy that emits usually large amounts of energy from a very compact central source, such as Seyfert galaxies, radio galaxies, and quasars. Also called: active galactic nucleus
References in periodicals archive ?
Caption: An active galaxy called a blazar, illustrated here, emits a jet of high-energy particles toward Earth.
In 2013 and 2014 the international team carried out the most extensive monitoring campaign of an active galaxy ever conducted.
Each observed field contains not only dozens of LMC stars, but also a background quasar, a brilliant beacon of light powered by a black hole in the core of the distant active galaxy.
Astronomers classify B0218+357 as a blazar -- a type of active galaxy noted for its intense emissions and unpredictable behavior.
M64 is quite an active galaxy with many regions of star formation, which may be the result of an interaction with a companion.
The devastating collision has drastically altered the appearance of both sets of stars creating huge amounts of heat - turning NGC 6240 into what experts call an "infrared luminous" active galaxy.
Observed: Ejection of high redshift, low luminosity quasars from active galaxy nuclei.
Density of the physical space between galaxies is at the minimum; in the center of an active galaxy, density of physical space is at maximum.
The other two of VSOP's `three key sources' are NGC 4258, the best black hole candidate, and the galaxy Virgo A, another active galaxy, but further off than Centaurus A.
Washington, March 14 ( ANI ): Researchers have obtained the most detailed view so far of the warm dust in the environment of a supermassive black hole in an active galaxy.
Summary: TEHRAN (FNA)- ESO's Very Large Telescope Interferometer gathered the most detailed observations ever of the dust around the huge black hole at the center of an active galaxy.
Astrophysicist Marco Ajello of Stanford and his colleagues used the orbiting Fermi Large Area Telescope to study distant blazars, a type of bright, active galaxy.