BL Lacertae objects
Also found in: Dictionary.
Related to BL Lacertae objects: Seyfert galaxy, Blazar, abl, quasar, ACBL
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.