An optically violent variable quasar (often abbreviated as OVV quasar) is a type of highly variable quasar. It is a subtype of blazar that consists of a few rare, bright radio galaxies, whose visible light output can change by 50% in a day. They are similar in appearance to BL Lacs but generally have a stronger broad emission line, and tend to have higher red shift components.
- "APEX takes part in sharpest observation ever". ESO Press Release. Retrieved 18 July 2012.
- Darling, David. 2004. The Universal Book of Astronomy.
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