| http://www.w3.org/ns/prov#value | - Astronomers believe that such black hole central enginesgenerate the radio, X-ray, and gamma-ray energy radiated by Centaurus A and other active galaxies.Yes, but not many are known.http://www.nasa.gov/mission_pages/swift/bursts/monster-black-holes.htmlNASA-Swift article wrote:Astronomers refer to galaxy centers exhibiting such intense emission as active galactic nuclei (AGN).
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