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....

BL Lacertae or BL Lac is a highly variable, extragalactic active galactic nucleus (AGN or active galaxy). It was first discovered by Cuno Hoffmeister...

a BL Lacertae object (of lower luminosity than its surrounds) seen from a relatively large angle. Flux variations, characteristic of the BL Lacertae objects...

stars. It also contains the prototypic blazar BL Lacertae. Lacerta contains no Messier objects. Alpha Lacertae is a blue-white hued main-sequence star of...

(though still too faint to see with the naked eye); and PKS 2155-304, a BL Lacertae object that is one of the optically brightest blazars in the sky. Pisces...

class of galaxy: BL Lacertae-type objects. This terminology was soon shortened to "BL Lacertae object", "BL Lac object" or simply "BL Lac". (The latter...

BL Lac may refer to: BL Lacertae, an active galaxy, prototype of the BL Lacertae objects BL Lacertae object, a type of active galaxy, based on the prototype...

light-years). It is the closest radio galaxy to Earth, as well as the closest BL Lac object, so its active galactic nucleus has been extensively studied by professional...

Edward Fomalont and Sergei Kopeikin in September 2002. OJ 287 is a BL Lacertae object located 3.5 billion light years away that has produced quasi-periodic...

blazar located in the constellation Ursa Major. The object is an active galaxy and a BL Lacertae object, and is a strong source of gamma rays. It is about...