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22 relations: Absolute magnitude, Active galactic nucleus, Astrophysical jet, BL Lacertae, Blazar, Cambridge University Press, Charge-coupled device, Elliptical galaxy, Hubble Space Telescope, Markarian 421, Markarian 501, Monthly Notices of the Royal Astronomical Society, OJ 287, OVV quasar, PKS 0521-365, PKS 2155-304, Quasar, Radio galaxy, Redshift, Superluminal motion, Variable star, 3C 371.
Absolute magnitude
Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.
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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, with characteristics indicating that the excess luminosity is not produced by stars.
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Astrophysical jet
An astrophysical jet is an astronomical phenomenon where outflows of ionised matter are emitted as an extended beam along the axis of rotation.
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BL Lacertae
BL Lacertae or BL Lac is a highly variable, extragalactic AGN (active galactic nucleus or active galaxy).
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Blazar
A blazar is a very compact quasar (quasi-stellar radio source) associated with a presumed supermassive black hole at the center of an active, giant elliptical galaxy.
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Cambridge University Press
Cambridge University Press (CUP) is the publishing business of the University of Cambridge.
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Charge-coupled device
A charge-coupled device (CCD) is a device for the movement of electrical charge, usually from within the device to an area where the charge can be manipulated, for example conversion into a digital value.
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Elliptical galaxy
An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless image.
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Hubble Space Telescope
The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
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Markarian 421
Markarian 421 (Mrk 421, Mkn 421) is a blazar located in the constellation Ursa Major.
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Markarian 501
Markarian 501 (or Mrk 501) is a galaxy with a spectrum extending to the highest energy gamma rays.
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Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.
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OJ 287
OJ 287 is a BL Lac object located 3.5 billion light-years away that has produced quasi-periodic optical outbursts going back approximately 120 years, as first apparent on photographic plates from 1891.
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OVV quasar
An optically violent variable quasar (often abbreviated as OVV quasar) is a type of highly variable quasar.
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PKS 0521-365
PKS 2155-304 is one of the brightest active galaxies in the sky.
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PKS 2155-304
PKS 2155-304 is one of the brightest active galaxies in the sky.
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Quasar
A quasar (also known as a QSO or quasi-stellar object) is an extremely luminous active galactic nucleus (AGN).
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Radio galaxy
Radio galaxies and their relatives, radio-loud quasars and blazars, are types of active galaxy that are very luminous at radio wavelengths, with luminosities up to 1039 W between 10 MHz and 100 GHz.
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Redshift
In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.
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Superluminal motion
In astronomy, superluminal motion is the apparently faster-than-light motion seen in some radio galaxies, BL Lac objects, quasars and recently also in some galactic sources called microquasars.
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Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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3C 371
3C 371 is a BL Lac object located in the constellation Draco.
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Redirects here:
BL Lac object, BL Lac objects, BL Lacertae Object, BL Lacertae Objects, BL Lacertae objects, Bl lac object.
References
[1] https://en.wikipedia.org/wiki/BL_Lacertae_object
