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BL Lac object

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noun
an extremely compact violently variable form of active galaxy
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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

Words nearby BL Lac object

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Scientific definitions for BL Lac object

BL Lac object
[ bēĕl 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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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