A blazar is a very compact quasar (quasi-stellar radio source) associated with a presumed supermassive black hole at the center of an active, giant elliptical galaxy. Blazars are among the most energetic phenomena in the universe and are an important topic in extragalactic astronomy. Blazars are members of a larger group of active galaxies that ho...
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http://en.wikipedia.org/wiki/Blazar
A class of active galaxy that includes BL Lacertae objects, high polarization quasars (HPQs), and optically violent variables (OVVs). Blazars are characterized by strong, compact, flat-spectrum radio emission. They also show continuum domination of the optical emission, and/or significant optical po...
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http://www.daviddarling.info/encyclopedia/B/blazar.html
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