Linked from

The 38 pages that link to Quasar, each with the reason it gives.

• Active galactic nucleusBroader topic: Quasars are the most conspicuous high-luminosity examples of active nuclei.

• Gravitational lensingRelated: Lensed quasars provide multiple images whose brightness and timing can be measured.

• Galaxy mergerRelated: Gas driven toward a central black hole during some mergers can fuel quasar activity.

• PulsarCompared with: Its variability can be rapid, but it is not caused by a rotating neutron star’s sweeping beam.

• Very Long Baseline InterferometryRelated: Compact quasars provide distant reference points for VLBI astrometry and geodesy.

• Supermassive black holeRelated: Quasars reveal rapidly accreting black holes across large distances and early cosmic times.

• Gravitational lensRelated: A variable quasar behind a lens can appear as multiple images with measurable time delays.

• ReionizationRelated: Quasars emit abundant ionizing radiation, though their scarcity may limit their contribution at early times.

• Ultraviolet astronomyRelated: Ultraviolet emission and absorption probe the accretion region and gas around quasars.

• Sloan Digital Sky SurveyRelated: SDSS spectroscopy identified large samples of quasars across cosmic history.

• Seyfert galaxyCompared with: Quasars are typically far more luminous than Seyfert nuclei, though both are powered by accretion.

• Lyman-alpha forestNarrower topic: Its bright, distant continuum provides the background light absorbed by foreground hydrogen.

• Margaret BurbidgeBroader topic: Burbidge's observations and arguments helped establish quasars as distant, energetic astronomical sources.

• BlazarCompared with: Quasars can be viewed at varied angles; blazars specifically have jets aimed nearly at Earth.

• Pulsar wind nebulaCompared with: Its central power source is black-hole accretion, not a rotating neutron star.

• Eddington luminosityRelated: Its luminosity can be compared with the Eddington limit to estimate black-hole mass and accretion state.

• Geoffrey BurbidgeRelated: Burbidge studied quasars and challenged claims that their redshifts necessarily measured enormous distances.

• International Celestial Reference SystemBroader topic: Compact quasars provide many of the distant radio sources used to anchor the celestial frame.

• Lookback timeRelated: Quasars can be observed at great redshifts, showing the universe at large lookback times.

• Lyman seriesRelated: Its bright continuum makes intervening Lyman absorption visible across large distances.

• Palomar ObservatoryRelated: Palomar surveys helped identify quasars and establish their importance in extragalactic astronomy.

• Ultraluminous infrared galaxyCompared with: A quasar is identified by powerful nucleus emission, while a ULIRG is classified by total infrared luminosity.

• Broad-line regionRelated: Quasars often show prominent broad lines, making their regions measurable across cosmic distances.

• Luminous infrared galaxyCompared with: A quasar is defined by a bright nucleus, whereas this class is defined by total infrared luminosity.

• Martin RyleRelated: Radio surveys helped reveal compact, distant sources later identified as quasars.

• 3C 273Narrower topic: 3C 273 became the first recognized member of this class.

• Wide-field Infrared Survey ExplorerRelated: WISE’s infrared colours helped identify quasars obscured by dust.

• NASA/IPAC Extragalactic DatabaseBroader topic: Quasars are among the distant sources whose measurements NED organizes.

• Extragalactic astronomyBroader topic: Distant quasars probe the early universe and the material between galaxies.

• NGC 1275Compared with: NGC 1275 is active but far less luminous than a typical quasar.

• Huge-LQGNarrower topic: The 73 objects defining Huge-LQG are quasars observed across a broad region of space.

• Large quasar groupNarrower topic: Quasars are the bright objects whose positions define the group.

• Sagittarius A*Compared with: Sagittarius A* is comparatively faint and does not shine like a quasar.

• Astronomical radio sourceBroader topic: Some quasars are powerful radio emitters with large jets extending beyond their host galaxies.

• BL LacertaeCompared with: Its weak spectral lines contrasted with the conspicuous signatures common in quasars.

• Black hole astronomyBroader topic: Quasars reveal rapidly accreting black holes across the distant universe.

• Intergalactic dustRelated: Quasar spectra and colors provide distant sightlines for searching for intervening dust.

• Viktor AmbartsumianBroader topic: Quasars became a striking case for the energetic galactic nuclei he helped bring into focus.