BL Lac object

noun

an extremely compact violently variable form of active galaxy

BL Lac object

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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Word History and Origins

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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Example Sentences

Examples have not been reviewed.

The BL Lac object studied by the authors is called 1ES 1553+113, and is more than 2,200 megaparsecs away.

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The exact redshift of the BL Lac object is unknown; the best available estimate6 suggests that it is at least 0.41.

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This value is less than the redshift of one of the X-ray absorbers, which implies that this absorber is either part of the BL Lac object, or a misidentification of something else.

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B.LL.BLM

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