BL Lac object
an extremely compact violently variable form of active galaxy
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What Are Prepositional Phrases?Prepositional phrases are the kinds of things you use all the time without thinking about them. They’re groups of words that begin with a preposition and end with an object. Prepositions are words like about, across, after, for, and in. You’ll see them in simple prepositional phrases, like about zebras, after school, and with friends. Objects of Prepositions When we say object, we mean the …
Word Origin for BL Lac object
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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Science definitions for bl lac object
BL Lac object
[ bē′ĕl′ läk′ ]
A distant radio galaxy with an intensely bright active galactic nucleus that emits a jet of material directly toward the Earth. BL Lac objects may be a class of blazar, though there is evidence that they are an optical effect caused by gravitational lensing of some other bright object by an intervening galaxy. Also known as BL Lacertae objects.
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