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https://h2g2.com/edited_entry/A39787023#:~:text=This%20indicates%20that%20BL%20Lacertae%20is%20very%20small,which%20makes%20it%20smaller%20than%20our%20solar%20system.
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.. BL Lacertae became the prototype of an active galaxy nucleus class, known …
https://www.sciencedirect.com/topics/physics-and-astronomy/bl-lacertae-objects
The BL Lacertae object AO 0235+164 is active in most wavelengths. The amplitude of its variability is about 3–4 and up to 100 times its quiescent flux density in radio and optical wavelengths respectively. The timescale of its variability ranges from months at low frequencies to days at optical wavelengths ( Chu et al., 1996 ).
https://science.jrank.org/pages/945/BL-Lacertae-Object.html
BL Lacertae objects, abbreviated BL Lac, are one subclass of active galactic nuclei (AGN), the extremely energetic nuclei of active galaxies. Roughly 40 BL Lac objects are known. Perhaps the most obvious property of BL Lac objects is that they look like stars. Astronomers originally thought the prototype, BL Lac, was a star.
https://ntrs.nasa.gov/api/citations/20120008626/downloads/20120008626.pdf
BL Lacertae objects beyond redshift 1.3 - UV-to-NIR photometry and photometric redshift for Fermi/LAT blazars ... Except in a few cases where visibility or weather con- ... observations were typ-ically achieved within 1-2d of each other (see Fig. 1). Thezphot uncertainties associated with these offsets will be discussed in Sect. 4.3.
https://en.wikipedia.org/wiki/BL_Lacertae_Object
A BL Lacertae object or BL Lac object is a type of active galactic nucleus (AGN) or a galaxy with such an AGN, named after its prototype, BL Lacertae.In contrast to other types of active galactic nuclei, BL Lacs are characterized by rapid and large-amplitude flux variability and significant optical polarization. Because of these properties, the prototype of the class was originally …
https://ui.adsabs.harvard.edu/abs/2002A&A...390..407V/abstract
The WEBT. BL Lacertae. Campaign 2000. We present UBVRI light curves of BL Lacertae from May 2000 to January 2001, obtained by 24 telescopes in 11 countries. More than 15 000 observations were performed in that period, which was the extension of the Whole Earth Blazar Telescope (WEBT) campaign originally planned for July-August 2000.
https://www.mdpi.com/2075-4434/6/1/2/html
In this work, we present the results of our multi-band microvariability study of the famous blazar BL Lac. We performed microvariablity observations of the source in the optical VRI bands for four nights in 2016. We studied the intranight flux and spectral variability of the source in detail with an objective to characterize microvariability in the blazars, a frequently observed phenomenon in ...
https://ui.adsabs.harvard.edu/abs/1996AAS...189.3103S/abstract
The preliminary PCA light curve appears to show short-term variability with flux changes of about a factor 2 within a few hours, superimposed on a longer-timescale variability trend. We present the results of the timing and spectral analysis of the first XTE observations of the bright BL Lacertae object PKS 2155-304 (z=0.116), which were performed in May 1996 as part of a 2 …
https://ui.adsabs.harvard.edu/abs/2002A%26A...393...89A/abstract
Abstract. The nearby BL Lacertae (BL Lac) object Markarian 421 (Mkn 421) at a red shift z=0.031 was observed to undergo strong TeV gamma -ray outbursts in the observational periods from December 1999 until May 2001.The time averaged flux level F(E>1 TeV) in the 1999/2000 season was (1.43+/-0.04) x 10-11 ph cm-2 s-1, whereas in the 2000/2001 season the average integral …
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