Electromagnetic extraction of rotational energy from disc-fed black holes - The strength of the Blandford-Znajek process

Details Electromagnetic extraction of rotational energy from disc-fed black holes - The strength of the Blandford-Znajek process Electromagnetic extraction of rotational energy from disc-fed black holes - The strength of the Blandford-Znajek process

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..887g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. 887

Astronomy and Astrophysics

Astronomy

137

Angular Momentum, Black Holes (Astronomy), Accretion Disks, Magnetic Flux, Interstellar Magnetic Fields, Momentum Transfer, Quasars, Radio Galaxies, Dynamo Theory, Radio Sources (Astronomy)

Scientific paper

We critically assess the current state of knowledge of the strengths of the magnetic fields B(H) threading the horizons of accretion disk-fed black holes in quasars and radio galaxies. We show that those values of B(H) which correspond to the strengths of the magnetic fields expected to be maintained in accretion disks by the action of hydromagnetic dynamos, according to recent numerical simulations, are significantly lower than those which have been suggested previously, and consequently the strength of the Blandford-Znajek (BZ) process for the extraction of the rotational energy of the black hole is lower than imagined previously. This result appears to be rather robust in the sense that it depends neither on the details of the simulation nor on the actual value of the magnetic field generated by the disk dynamo, but only on the strength of the magnetic transport of angular momentum in the disk, the value of which always emerges as roughly constant from the above simulations. Thus, the BZ process does not appear to be adequate for accounting for the strongest double radio sources accreting at far sub-Eddington rates.

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