active galactic nucleus (AGN)
Chandra X-ray image of Centaurus A showing a bright central source: the active galactic nucleus suspected of harboring a supermassive black hole ...
Active galactic nucleus
An active galaxy is a galaxy where a significant fraction of the energy output is not emitted by the normal components of a galaxy: stars, dust and interstellar gas.
Active galactic nucleus
Wikipedia, the free encyclopedia - Cite This Source ...
Active Galactic Nucleus - The nucleus of an active galaxy
Active Galaxy - A galaxy whose nucleus is unusually bright and small. Seyfert galaxies, BL Lacertae objects, and quasars are examples of active galaxies ...
active galactic nucleus (AGN): The central energy source of an active galaxy.
active galaxy: A galaxy that is a source of excess radiation, usually radio waves, X rays, gamma rays, or some combination.
Active Galactic Nucleus
AGN -- An unusually bright galactic nucleus whose light is not due to starlight.
Active Galaxy ...
Active Galactic Nucleus (AGN)
A very bright, compact region found at the center of certain galaxies. The brightness of an active galactic nucleus is thought to come from an accretion disk around a supermassive black hole.
Active Galactic Nucleus (AGN): The central region of an active galaxy where the energtic activity is concentrated.
Main article: Active galactic nucleus
A portion of the galaxies we can observe are classified as active.
active galaxy, active galactic nucleus, AGN
radio wavelengths, radiowaves
bremsstrahlung radiation ...
For example, the active galactic nucleus of NGC 1068 is shown at X-ray (blue/green) and optical (red) wavelengths.
An AGN is short for "Active Galactic Nucleus." Some galaxies have nuclei (centers) that are 'active', meaning they emit large amounts of radiation (radio, optical, X-rays, gamma-rays, particle jets, etc.), and/or are highly variable.
One unsolved mystery that has left astronomers puzzled is where the material comes from to disturb a black hole from its slumber, triggering angry outbursts as it is awoken and becoming an active galactic nucleus.
An extreme form of active galactic nucleus in which the light is dominated by nonthermal continuum emission and there are no emission lines present in the spectrum, in contrast to the case of quasars.
Firstly X-rays are emitted by black holes in active galactic nucleus, or AGN for short, galaxy clusters, supernova remnants, stars, binary stars containing a white dwarf (cataclysmic variable stars), neutron star or a black hole (X-ray binaries), ...
jets
Beams of particles, usually coming from an active galactic nucleus or a pulsar. Unlike a jet airplane, when the stream of gas is in one direction, astrophysical jets come in pairs with each jet aiming in opposite directions.
K ...
A Quasi-stellar radio source is a powerfully energetic and distant active galactic nucleus.
From it pours a variable jet at nearly the speed of light, making M 87 an "active galaxy" and the core an "active galactic nucleus," or "AGN.
If this cloud can be excited by a nearby source of energy such as hot, young stars or an active galactic nucleus then the electrons in atoms of the gas cloud can get excited. When they de-excite they emit photons of specific frequency and wavelength.
JETS
Jets are blasts of particles that are emitted by an active galactic nucleus or a pulsar. Jets only occur in pairs, going in opposite directions.
The central region of an active galaxy is called an "active galactic nucleus" (AGN) where energetic activity is concentrated.
there are many cluster located there, the main reason for Lacerta's fame is BL Lacertae. This object, originally identified as an irregular variable star, is now known to correspond to a quasi-stellar object a.k.a. an active galactic nucleus ...
active galactic nuclei are produced by material spiraling into a disk around the black hole, and being squashed out the top and bottom of the disk as it tries to enter the black hole. This explanation for the "engine'' in an active galactic nucleus ...
 See also: Galactic nucleus, Nucleus, Galaxy, Black Hole, Galaxies
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