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| Paper: |
Radiation-Magnetohydrodynamic Simulations of
Accretion Flow and Outflow around Black Hole |
| Volume: |
427, Accretion and Ejection in AGN: a Global View |
| Page: |
56 |
| Authors: |
Ohsuga, K. |
| Abstract: |
Black-hole accretion, the most powerful energy-production mechanism
in the Universe, is known to exhibit several distinct modes.
Although theoretical models for each mode were proposed,
no unified models have been proposed so far.
We here propose a unified model for accretion flow and outflow
based on our new, global,
two-dimensional radiation-magnetohydrodynamic simulations,
in which we no longer adopt the phenomenological disk-viscosity
prescription. The accretion flow is geometrically thin
in the moderate luminosity range and thick in the high
and low luminosity ranges.
The disk outflows with helical magnetic fields are ubiquitous
in any accretion modes, including the medium luminosity state,
in which no strong outflows were expected. |
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