AST-547beginner

Active Galactic Nuclei, Seyferts & Quasars: Structures & Vocabulary

Active galactic nuclei are extraordinarily luminous galactic centers powered by matter accreting onto supermassive black holes. AGN trace black-hole growth, influence galaxy gas through feedback, illuminate intergalactic material, and provide beacons visible across much of cosmic history.

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Active Galactic Nuclei, Seyferts & Quasars: Structures & Vocabulary

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AST-546Active Galactic Nuclei, Seyferts & Quasars: Foundations→

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AST-548Active Galactic Nuclei, Seyferts & Quasars: Physical Mechanisms→

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Active galactic nuclei are extraordinarily luminous galactic centers powered by matter accreting onto supermassive black holes.

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Infalling gas releases gravitational energy efficiently as it spirals through an accretion disk.

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Rapid variability limits the emitting-region size, broad spectral lines reveal fast gas near the nucleus, radio interferometry resolves jets, and stellar/gas dynamics confirm central supermassive black holes.