BL Lac object

Related to BL Lac object: abl, Blazar, Seyfert galaxy, ACBL

BL Lac object

(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]

Mentioned in ?

blazar

References in periodicals archive ?

Finally, turning to his home soil of the Variable Star Section (VSS), the President congratulated Gary Poyner upon his fine observations of the BL Lac object OJ 287, made as a part of the VSS's observing campaign for the object.

Annual general meeting, 2008 October 29: held at the royal astronomical society, Burlington house, Piccadilly, London WI

Weekes notes that the gamma radiation generated by Markarian 421 probably comes from the edges of a jet believed to emanate from a quasar-like entity, called a BL Lac object, at the galaxy's center.

Energetic gammas from beyond the galaxy

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.