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The 60 pages that link to Active galactic nucleus, each with the reason it gives.

• Infrared astronomyRelated: Dust around the central engine reradiates absorbed energy strongly in the infrared.

• Accretion diskBroader topic: Its disk can outshine the host galaxy as matter spirals toward the black hole.

• X-ray astronomyRelated: X-rays probe the accretion flow and energetic outflows near the central black hole.

• Cosmic rayRelated: Jets from active galactic nuclei are candidate sources of the most energetic cosmic rays.

• QuasarNarrower topic: Quasars are the most luminous class of active galactic nuclei.

• Relativistic jetNarrower topic: Relativistic jets are among the most prominent energy channels of some active galactic nuclei.

• Supermassive black holeBroader topic: It is the bright phase produced when the central black hole accretes substantial matter.

• Starburst galaxyCompared with: An active nucleus can mimic a starburst’s infrared brightness without being powered by young stars.

• GalaxyBroader topic: This energetic phase can drive winds and jets that alter a galaxy’s surroundings.

• Gamma-ray astronomyNarrower topic: Gamma-ray emission from active nuclei connects high-energy observations to black-hole accretion and relativistic jets.

• Barred spiral galaxyRelated: Inward gas transport by a bar may contribute to the material available for nuclear activity.

• Radio galaxyNarrower topic: Radio galaxies are one class of galaxies with an active galactic nucleus.

• Seyfert galaxyNarrower topic: Seyfert nuclei are one relatively nearby, lower-luminosity class of active galactic nucleus.

• Galaxy interactionRelated: Gas driven toward a galactic center by an interaction can fuel nuclear activity.

• Tidal disruption eventCompared with: Both emit from galactic centers, but an active nucleus is persistently powered rather than triggered by one disrupted star.

• Doppler beamingNarrower topic: Relativistic beaming shapes the observed emission of its jet-producing subclasses.

• BlazarNarrower topic: A blazar is an active galactic nucleus viewed along its jet.

• Galactic windRelated: Its radiation and jets can drive outflows far beyond the galaxy’s central region.

• Centaurus ANarrower topic: Centaurus A’s active nucleus links its central black hole to its jets and radio lobes.

• Star formation rateRelated: Its radiation can mimic or contaminate emission used to estimate a galaxy's rate.

• Galaxy ZooRelated: Galaxy Zoo studies have examined relationships between visible galaxy structure and nuclear activity.

• Very Long Baseline ArrayRelated: VLBA images resolve compact cores and jets in these energetic galaxies.

• Warm–hot intergalactic mediumRelated: Its outflows can transport metals and energy into the surrounding intergalactic medium.

• UhuruRelated: The survey showed that active galaxies are significant cosmic X-ray sources.

• Einstein ObservatoryRelated: Einstein detected and imaged X-ray emission from active galactic nuclei.

• Galactic barRelated: Gas transported inward by a bar may help fuel nuclear activity, though further transport is needed.

• Large Binocular TelescopeRelated: The telescope’s optical and infrared observations can investigate emission from galactic nuclei.

• Messier 87Narrower topic: M87’s active nucleus is the broader phenomenon that includes its accretion flow and jet.

• Nuclear star clusterCompared with: Its emitted light comes chiefly from accretion, unlike a cluster’s combined starlight.

• Ultraluminous infrared galaxyRelated: An obscured active nucleus can contribute substantially to a ULIRG’s infrared output.

• Broad-line regionNarrower topic: Its radiation illuminates the gas, while its gravity and outflows shape the region.

• Cygnus ANarrower topic: Cygnus A’s central engine is an unusually powerful example of this phenomenon.

• Luminous infrared galaxyRelated: Accretion can heat surrounding dust and contribute substantially to the infrared luminosity.

• Ultra-high-energy cosmic rayRelated: Its jets and outflows are proposed sites for accelerating the most energetic cosmic rays.

• XMM-NewtonRelated: XMM-Newton measures the X-ray emission and variability of accreting galactic cores.

• 3C 273Narrower topic: 3C 273 is an unusually bright example of this broader class.

• Arp 220Related: Black-hole activity may contribute to Arp 220’s central energy output alongside its starburst.

• Time-domain astronomyRelated: Variability across timescales probes changing accretion and the structure near its central black hole.

• Extragalactic astronomyBroader topic: Its emission offers evidence about central black holes and their effects on host galaxies.

• Messier 77Narrower topic: Messier 77’s bright nucleus places it in this broader class.

• NGC 1275Narrower topic: NGC 1275’s energetic core is one example of this broader phenomenon.

• NGC 4151Narrower topic: This central engine produces NGC 4151’s Seyfert activity.

• Peculiar galaxyRelated: An unusually energetic nucleus can distinguish a galaxy even when its overall shape is ordinary.

• High-energy astrophysicsBroader topic: Its accretion disk and jets produce some of the universe's most energetic emissions.

• Interacting galaxyRelated: Some encounters drive gas toward galactic centers, potentially feeding nuclear activity.

• Low-ionization nuclear emission-line regionNarrower topic: A LINER is a spectral classification, while an active nucleus is one possible physical engine.

• Lyman-alpha emitterRelated: Some emitters’ strong lines can be powered partly or chiefly by an active nucleus.

• Markarian 421Narrower topic: Markarian 421’s jet is powered by its active galactic nucleus.

• Markarian 501Narrower topic: Markarian 501’s blazar activity is a form of active galactic nucleus activity.

• MegamaserRelated: Maser emission can trace molecular gas close to an active nucleus.