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Aneta Siemiginowska () and Martin Elvis ()
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Aneta Siemiginowska: the Harvard-Smithsonian Center for Astrophysics
Martin Elvis: the Harvard-Smithsonian Center for Astrophysics

Nature, 1999, vol. 397, issue 6719, 476-479

Abstract: Quasars - the most luminous type of active galactic nuclei in the Universe - may not be active all the time. There is a growing consensus that quasars may have unstable galactic disks and therefore radiate only 10% of the time. If all observed quasars represent the outburst state, then this would explain how they can be so luminous without running out of fuel.

Date: 1999
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DOI: 10.1038/17223

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