BL Lac object
A BL Lac object or BL Lacertae object or BL Lac is a type of active galaxy with an active galactic nucleus (AGN), making it a type of AGN.
BL Lac Objects
Some of the properties of Optically Violent Variables (OVVs) are shared by ``BL Lac objects'', named after the prototype of the class, BL Lacertae, which was originally identified as a highly variable star, ...
BL Lac objects were in some cases first catalogued as variable stars (BL Lacertae, AP Librae). They are highly variable, highly polarized, and show virtually featureless continuous spectra.
BL Lac Object
A member of a class of astronomical objects with the following characteristics: (1) rapid variations in intensity at radio, infrared, and optical wavelengths; ...
BL Lac Object
Objects resemble quasars; thought to highly luminous cores of distant galaxies.
Black Body Radiation ...
BL Lac objects: Object that resembles a quasar; thought to be the highly luminous core of a distant galaxy emitting a jet almost directly toward Earth.
BL LAC OBJECT - Active galaxy characterized by very rapid (day to day) variability in total luminosity, no emission lines, strong nonthermal radiation, and starlike appearance.
blazar (BL Lac Object)
A type of active galaxy that varies in brightness over several years. The peculiar appearance and variability associated with these objects may be a result of our viewing perspective.
BL Lac Object (also Blazar): A type of active galaxy characterized by very rapid (day to day) variability by large percentages in total luminosity, no emission lines, strong nonthermal radiation, and starlike appearance.
BL Lac objects are named after BL Lacertae, the class prototype, a highly variable AGN. It was originally thought to be a variable star.
'Blazars' (BL Lac objects and OVV quasars). These classes are distinguished by rapidly variable, polarized optical, radio and X-ray emission.
Blazar or BL Lac Object: Objects that resemble quasars; thought to be the cores of highly luminous galaxies aligned so they are viewed directly down into the heart of the system.
INTERLUDE 25-1 BL Lac Objects
In 1929 an object thought to be a variable star was discovered in the constellation Lacerta. Astronomers gave it the two-letter code BL, so it became known as BL Lacertae, or BL Lac for short.
Rare BL Lac objects and blazars were discovered. These are radio galaxies with jets pointing directly at us, ejected by the active nucleus at velocities near the speed of light! ...
A third type of active galaxy called BL Lacertae objects (BL Lac objects for short) are probably radio galaxies with their jets pointed right at us. The energy from BL Lac objects varies very quickly and erratically.
The other classification encompasses blazars that have featureless optical spectra. These are known as BL Lac objects. Approximately 20% of blazars appear to be BL Lac objects, while the rest are FSRQs (1).
It became the founding member of the "BL Lac Objects," or "blazars" as they are sometimes called. The variable jet turns out to be pointed right at Earth, and thus "blazingly" bright.
There also are elliptical galaxies, N galaxies, and the so-called BL Lac objects, which have nuclei that are exceptionally bright in optical light.
 See also: Galaxies, Emission, Galaxy, Spectrum, Quasar
  
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