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1. en.wikipedia.org › wiki › Active_galactic_nucleusActive galactic nucleus - Wikipedia

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   Active galactic nucleus. An active galactic nucleus ( AGN) is a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars. Such excess, non-stellar emissions have been observed in the radio, microwave ...

2. webbtelescope.org › contents › articlesWhat Are Active Galactic Nuclei? | Webb

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   Mar 17, 2021 · Active galactic nuclei are active supermassive black holes that emit bright jets and winds, and shape their galaxies, whether they are nearby Seyfert galaxies or extremely distant quasars and blazars. Based on extensive evidence, active galactic nuclei, also commonly referred to as AGN, are now understood to be active supermassive black holes ...

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3. People also ask

   What are the characteristics of an AGN?

   • The observed characteristics of an AGN depend on several properties such as the mass of the central black hole, the rate of gas accretion onto the black hole, the orientation of the accretion disk, the degree of obscuration of the nucleus by dust, and presence or absence of jets .

   Active galactic nucleus - Wikipedia

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   What are AGNs used for?

   • AGNs are the most luminous persistent sources of electromagnetic radiation in the Universe. This means they can be used to discover distant objects. Astronomers have also classified different types of AGN based on their observed characteristics. The most powerful AGNs are known as quasars, which give rise to extremely luminous galactic centres.

   Active Galactic Nucleus | ESA/Hubble | ESA/Hubble

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   What are the different types of AGNs?

   • This means they can be used to discover distant objects. Astronomers have also classified different types of AGN based on their observed characteristics. The most powerful AGNs are known as quasars, which give rise to extremely luminous galactic centres. A blazar is an AGN with a jet of light and energy that is pointed toward the Earth.

   Active Galactic Nucleus | ESA/Hubble | ESA/Hubble

   esahubble.org/wordbank/active-galactic-nucleus/

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   What are the subclasses of AGN?

   • Numerous subclasses of AGN have been defined on the basis of their observed characteristics; the most powerful AGN are classified as quasars. A blazar is an AGN with a jet pointed toward the Earth, in which radiation from the jet is enhanced by relativistic beaming . Quasar 3C 273 observed by the Hubble Space Telescope.

   Active galactic nucleus - Wikipedia

   en.wikipedia.org/wiki/Active_galactic_nucleus

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4. esahubble.org › wordbank › active-galactic-nucleusActive Galactic Nucleus | ESA/Hubble | ESA/Hubble

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   An active galactic nucleus (AGN) is a bright region at the centre of some galaxies powered by a supermassive black hole. Learn about different types of AGNs, how Hubble observes them, and how they affect their host galaxies.

5. agn.orgSupporting business management globally - AGN International

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   AGN International Ltd is a company limited by guarantee registered in England & Wales, number 3132548, registered office 3 More London Riverside, London SE1 2RE, United Kingdom. AGN International Ltd (and its regional affiliates; together "AGN") is a not-for-profit worldwide membership association of separate and independent accounting and ...

6. astrobites.org › guides › galaxy-and-agn-typesGuide to Classification of Galaxies and AGNs | astrobites

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   Learn about the classification of galaxies and active galactic nuclei (AGNs) based on their morphology, star formation, emission lines, and more. Find examples, references, and famous objects for each type.

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7. scitechdaily.com › astronomy-astrophysics-101Astronomy & Astrophysics 101: Active Galactic Nucleus

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   Mar 16, 2022 · Learn what an active galactic nucleus (AGN) is, how it is formed, and how it affects its host galaxy. See stunning images of AGNs captured by the Hubble Space Telescope and other telescopes.

8. www.astronomy.swin.edu.au › cosmos › AActive Galactic Nuclei | COSMOS - Swinburne

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   These nuclei are called active galactic nuclei, or AGN for short. Much of the energy output of AGN s is of a non-thermal (non- stellar) type of emission, with many AGN being strong emitters of X-rays, radio and ultraviolet radiation, as well as optical radiation. AGN can vary in luminosity on short (hours or days) timescales.