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https://kurzgesagt.fandom.com/wiki/BL_Lacertae
BL Lacertae, or shortened to BL Lac, is a very variable active galaxy nucleus (AGN), which are some sort of cousins of quasars. It's located in the constellation of Lacerta, 900 million light-years away. It was originally thought to be a variable star within the Milky Way, so it was given a variable star designation.
https://www.jstor.org/stable/2368904
for a few BL Lacertae objects approach those for quasars (ref. 5 and references therein; C. Lawrence, personal communica-tion). Thus, although the division in emission line luminosities separating BL Lacertae objects and quasars is not sharp, a systematic difference in emission line luminosity between the two classes does clearly exist.
https://www.sciencedirect.com/topics/physics-and-astronomy/bl-lacertae-objects
Blazars, the generic term for BL Lacertae objects and flat-spectrum radio quasars, show highly variable non-thermal emission from radio to γ-ray bands. HBLs, defined as BL Lac objects with high peak energy of synchrotron radiation, are candidate TeV emitters because all the BL Lacs detected so far in the TeV γ-ray region are HBLs.
https://skyandtelescope.org/observing/12-quasars-for-spring-evenings/
Blazars are also called BL Lacertae objects after BL Lacertae, one of the first of its class discovered. The Hubble Space Telescope image at left shows the brilliant quasar 3C 273 in Virgo and one of its long, snaking jets.
https://ui.adsabs.harvard.edu/abs/1990A&A...235L...1W/abstract
Six flat spectrum radio sources (two quasars and four BL Lac objects) were monitored simultaneously in the optical (R-band) and radio (6 and 11 cm) regimes with a time resolution of a few hours. In three of the BL Lac objects intraday variability was detected in both wavelength ranges; the other three sources did not show significant variations in either domain.
https://ui.adsabs.harvard.edu/abs/1992ApJ...400L..17S/abstract
New observations of the very red quasar or BL Lac object PKS 1413 + 135 are presented. Optical imaging and spectroscopy confirm the claim that the host galaxy to this BL Lac is a spiral, and H-band imaging shows the point source centered in the galaxy to within 0.1". A reanalysis of Einstein X-ray data finds evidence for an extremely large column density in this source of n …
https://quizlet.com/351179485/chapter-17-flash-cards/
Double radio sources, quasars, and BL Lacertae objects are now considered to be the same basic type of object—an accretion disk producing two oppositely directed jets—but they appear to us to be very different because. Click card to see definition 👆. Tap card to see definition 👆. we view them at different angles to the line of the double jets. Face-on to the accretion disk the source will …
https://iopscience.iop.org/article/10.1086/316244/pdf
Note.—Units of right ascension are hours, minutes, and seconds, and units of declination are degrees, arcminutes, and arcseconds. a BL Lac 5 BL Lacertae object; HPQ 5 highly polarized quasar. b The redshift of 3C 66A is uncertain (Miller, French, & Hawley 1978). Smith et al. 1992 and references therein) for all observations.
https://scienceworld.wolfram.com/astronomy/BLLacertaeObject.html
BL Lacertae Object : A class of blazar. They are distant quasar-like objects with no spectral lines which are often highly variable (by up to a factor of 100 over a few months). They exhibit high intensity emission from radio to gamma ray wavelengths. An example is PKS 2155-304, one of the brightest X-ray emitter.
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