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A class of extragalactic, violently variable objects that includes BL Lacertae objects and optically violently variable (OVV) quasars, from which the name is contracted. They are thought to be the high-speed jet of plasma and radiation from an active galactic nucleus viewed nearly end-on. The OVV quasars have broad emission lines in their spectra, but otherwise show all the characteristics of BL Lac objects.

Subjects: Astronomy and Astrophysics.

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