BL Lacertae objects
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BL Lacertae objects[¦bē¦el lə′ser·tē ‚äb·jiks]
A class of extragalactic sources of extremely intense, highly variable electromagnetic radiation which are related to quasars but have a featureless optical spectrum, and display strong optical polarization and a radio spectrum that increases in intensity at shorter wavelengths.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.