BL Lac object

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BL Lac object

n
(Celestial Objects) an extremely compact violently variable form of active galaxy
[C20: named after BL Lacertae, first identified example found in the constellation Lacerta and originally thought to be a variable star]
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General topics include optical variability, including long-term optical quasar variability, IR variability, including the correlation of near infrared and optical variability on NGC 4151, x-ray variability, including the relationship between optical and x-ray variability in Seyfert galaxies, radio variability, including 3C 120 and the disk-jet connection, blazars, including photometric and polarimetric observations of BL Lac objects in the optical region, including flows and shocks in Seyfert Galaxy nuclei and general considerations, including closing thoughts on AGN variability by the conference chair.
The intensity of gamma radiation from each source -- quasar relatives called BL Lac objects -- represents 10 trillion times the output of the sun at all wavelengths.