Magnetized Accretion Inside the Marginally Stable Orbit around a Black Hole

Abstract

Qualitative arguments are presented to demonstrate that the energy density of magnetic fields in matter accreting onto a black hole inside the marginally stable orbit is automatically comparable to the rest-mass energy density of the accretion flow. Several consequences follow: magnetic effects must be dynamically significant, but cannot be so strong as to dominate; outward energy transport in Alfven waves may alter the effective efficiency of energy liberation; and vertical magnetic stresses in this region may contribute to "coronal" activity.

to appear in Ap. J. Letters

References in corpus (1)

• Extracting energy from black holes: the relative importance of the Blandford-Znajek mechanism

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