Active galactic nuclei.
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- Record sourced from PubMed, PMID 10220363.
- Also identified by PMC identifier 33567.
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Abstract
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.