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- W1963586181 abstract "A large-scale closed magnetic field can transfer angular momentum and energy between a black hole (BH) and its surrounding accretion flow. We investigate the effects of this magnetic coupling (MC) process on the dynamics of a hot accretion flow (e. g., an advection-dominated accretion flow). The energy and angular momentum fluxes transported by the magnetic field are derived with an equivalent-circuit approach. For a rapidly rotating BH, it is found that the radial velocity and the electron temperature of the accretion flow decrease, whereas the ion temperature and the surface density increase. The significance of the MC effects depends on the value of the viscosity parameter alpha. The effects are obvious for alpha = 0.3 but nearly ignorable for alpha = 0.1. For a BH with specific angular momentum a(*) = 0.9 and alpha = 0.3, we find that for reasonable parameters the radiative efficiency of a hot accretion flow can be increased by similar to 30%." @default.
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- W1963586181 date "2007-12-20" @default.
- W1963586181 modified "2023-10-18" @default.
- W1963586181 title "Influence of the Magnetic Coupling Process on Advection‐dominated Accretion Flows around Black Holes" @default.
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- W1963586181 doi "https://doi.org/10.1086/522917" @default.
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