Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pnas...96.4749f&link_type=abstract
Proceedings of the National Academy of Sciences of the United States of America, Volume 96, Issue 9, pp. 4749-4751
Physics
2
Scientific paper
Active galactic nuclei are the most powerful, long-lived objects in the Universe. Recent data confirm the theoretical idea that the power source is accretion into a massive black hole. The common occurrence of obscuration and outflows probably means that the contribution of active galactic nuclei to the power density of the Universe has been generally underestimated.
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