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 ?
Additionally, many more distant galaxies are visible; sitting at the outskirts of the spiral arms, they appear tiny and delicate compared to the colossal active galaxy .
ASTRONOMERS have discovered an object in the active galaxy Cygnus A that wasn't there before.
Following a massive recall effort, Samsung will remotely disable the remaining active Galaxy Note 7 handsets before the end of this month, according to a (http://www.
Caption: An active galaxy called a blazar, illustrated here, emits a jet of high-energy particles toward Earth.
He explores such topics as redder than red, making electrons from photons, the outer solar system and the problem of Pluto, stellar death, the origin of the initial mass function, the active galaxy menagerie, the most distant galaxies known, a brief history of the universe, and the Space Infrared Telescope for Cosmology and Astrophysics (SPICA).
In 2013 and 2014 the international team carried out the most extensive monitoring campaign of an active galaxy ever conducted.
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.
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.
Nearby, about 2[degrees] east of brilliant Algol, lies a real monster, an active galaxy that dominates the Perseus Galaxy Cluster.