active galaxy
(galaxy with an active, i.e., extremely luminous central region)
An active galaxy is a
galaxy whose central region has a very high luminosity.
Such excess emission has been observed in radio,
infrared, visible light, X-ray, and gamma rays
bands. The nucleus is called an active galactic nucleus (AGN).
The radiation is assumed to be due to accretion of mass
by a supermassive black hole. Often associated with such a
nucleus is a relativistic jet.
(galaxy type)
Further reading:
http://en.wikipedia.org/wiki/Active_galactic_nucleus
https://imagine.gsfc.nasa.gov/science/objects/active_galaxies1.html
http://www.astronomy.ohio-state.edu/~ryden/ast162_9/notes37.html
Referenced by pages:
active galactic nucleus (AGN)
blazar
Canadian Institute for Theoretical Astrophysics (CITA)
duty cycle
Extended Chandra Deep Field-South Survey (ECDFS)
gas flow
jet
M87*
peculiar galaxy (p)
polarization
radio galaxy (RG)
Seyfert galaxy (Sy)
submillimeter galaxy (SMG)
Index