Abstract
Black holes with accretion disks are self-excited dynamos that generate large electric and magnetic fields. Along the spin axis they emit oppositely-directed narrow beams of high energy positrons and photons. The beams emanating from superholes are sufficiently powerful to explain extragalactic radio sources.
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Harrison, E. Electrified black holes. Nature 264, 525–528 (1976). https://doi.org/10.1038/264525a0
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DOI: https://doi.org/10.1038/264525a0
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