Magnetic Stress at the Marginally Stable Orbit: Altered Disk Structure, Radiation, and Black Hole Spin Evolution
作者： Eric Agol , Julian H. Krolik
DOI: 10.1086/308177
关键词: Supermassive black hole 、 Stellar black hole 、 Intermediate-mass black hole 、 Astrophysics 、 Spin-flip 、 Active galactic nucleus 、 Emissivity 、 Quasar 、 Physics 、 Accretion (astrophysics)
摘要: Magnetic connections to the plunging region can exert stresses on inner edge of an accretion disk around a black hole. We recompute relativistic corrections thin-disk dynamics equations when these take form time-steady torque disk. The additional dissipation associated with is concentrated relatively close outside marginally stable orbit, scaling as r-7/2 at large radius. As result stresses, spin-up central hole retarded; maximum spin-equilibrium efficiency 36% and occurs a/M = 0.94; spectrum extended toward higher frequencies; line profiles (such Fe Kα) are broadened if emissivity scales local flux; limb brightening, especially frequencies, enhanced; returning radiation fraction substantially increased, up 58%. This last effect creates possible explanations for both synchronized continuum fluctuations in active galactic nuclei polarization rises shortward Lyman quasars. show that no matter what occur, < 0.36, second law sets absolute upper bound efficiency.
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