Active galactic nucleus
An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion – and possibly all – of the electromagnetic spectrum. Such excess emission has been observed in the radio, microwaves, infrared, optical, ultra-violet, X-ray and gamma ray wavebands. A galaxy hosting an AGN is called an active galaxy. The radiation from an AGN is believed to be a result of accretion of matter by a supermassive black hole at the center of its host galaxy. AGN are the most luminous persistent sources of electromagnetic radiation in the universe, and as such can be used as a means of discovering distant objects; their evolution as a function of cosmic time also puts constraints on models of the cosmos.
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AGN classificationActive Galactic NucleiActive Galactic NucleusActive GalaxyActive Galaxy NucleiActive Galaxy NucleusActive galactic nucleiActive galaxiesActive galaxyActive galaxy nucleiActive galaxy nucleusBroad-Line RegionBroad-line regionGalactic nucleusGalaxy AGN classificationGalaxy active galactic nucleus classificationGalaxy agn classificationHost galaxyNarrow-line regionSeyfert flareUnited Theory of Active Galaxies
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Active galactic nucleus
An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion – and possibly all – of the electromagnetic spectrum. Such excess emission has been observed in the radio, microwaves, infrared, optical, ultra-violet, X-ray and gamma ray wavebands. A galaxy hosting an AGN is called an active galaxy. The radiation from an AGN is believed to be a result of accretion of matter by a supermassive black hole at the center of its host galaxy. AGN are the most luminous persistent sources of electromagnetic radiation in the universe, and as such can be used as a means of discovering distant objects; their evolution as a function of cosmic time also puts constraints on models of the cosmos.
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Actieve sterrenstelsels is een ...... nuclear emission-line region).
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An active galactic nucleus (AG ...... aints on models of the cosmos.
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Ein aktiver Galaxienkern, auch ...... und Infrarotflares nachweisen.
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En astronomie, une galaxie act ...... tes aux modèles cosmologiques.
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Galaktyka aktywna – galaktyka, ...... ako paliwo dla czarnej dziury.
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Uma galáxia ativa é uma galáxi ...... trições nos modelos do cosmos.
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Una galassia attiva è una gala ...... egare l'origine dell'universo.
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Una galaxia se dice activa cua ...... las que no (radio-quiet AGN).
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Активные ядра галактик — ядра, ...... тво галактики, а её состояние.
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نواة مجرة نشطة (بالإنجليزية: a ...... احل نشأتها وتتطورها مع الزمن..
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Actieve sterrenstelsels is een ...... ren uit de omgeving verslindt.
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An active galactic nucleus (AG ...... aints on models of the cosmos.
@en
Ein aktiver Galaxienkern, auch ...... galaxien, Quasare, BL-Lacertae
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En astronomie, une galaxie act ...... en fonction du temps cosmique
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Galaktyka aktywna – galaktyka, ...... arną dziurę o masie 105 - 1010
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Uma galáxia ativa é uma galáxi ...... trições nos modelos do cosmos.
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Una galassia attiva è una gala ...... oletto, raggi X e raggi gamma.
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Una galaxia se dice activa cua ...... emitida es la región central.
@es
Активные ядра галактик — ядра, ...... явлениями активности являются:
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نواة مجرة نشطة (بالإنجليزية: a ...... احل نشأتها وتتطورها مع الزمن..
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label
Actief sterrenstelsel
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Active galactic nucleus
@en
Aktiver Galaxienkern
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Galaktyka aktywna
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Galassia attiva
@it
Galaxia activa
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Galaxie active
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Galáxia ativa
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Активные ядра галактик
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نواة مجرة نشطة
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