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• W3100524163 endingPage "88" @default.
• W3100524163 startingPage "88" @default.
• W3100524163 abstract "Significant fraction of matter in supercritical (or super-Eddington) accretion flow is blown away by radiation force, thus forming outflows, however, the properties of such radiation-driven outflows have been poorly understood. We have performed global two-dimensional radiaion-magnetohydrodynamic simulations of supercritical accretion flow onto a black hole with 10 or 10^8 solar masses in a large simulation box of 514 r_S x 514 r_S (with r_S being the Schwarzschild radius). We confirm that uncollimated outflows with velocities of 10 percents of the speed of light emerge from the innermost part of the accretion flow over wide angles of 10 - 50 degree from the disk rotation axis. Importantly, the outflows exhibit clumpy structure above heights of ~ 250 r_S. The typical size of the clumps is ~ 10 r_S, which corresponds to one optical depth, and their shapes are slightly elongated along the outflow direction. Since clumps start to form in the layer above which (upward) radiation force overcomes (downward) gravity force, Rayleigh-Taylor instability seems to be of primary cause. In addition, a radiation hydrodynamic instability, which arises when radiation funnels through radiation-pressure supported atmosphere, may also help forming clumps of one optical depth. Magnetic photon bubble instability seems not to be essential, since similar clumpy outflow structure is obtained in non-magnetic radiation-hydrodynamic simulations. Since the spatial covering factor of the clumps is estimated to be ~ 0.3 and since they are marginally optically thick, they will explain at least some of rapid light variations of active galactic nuclei. We further discuss a possibility of producing broad-line clouds by the clumpy outflow." @default.
• W3100524163 created "2020-11-23" @default.
• W3100524163 creator A5013882518 @default.
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• W3100524163 date "2013-08-25" @default.
• W3100524163 modified "2023-09-30" @default.
• W3100524163 title "Clumpy Outflows from Supercritical Accretion Flow" @default.
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• W3100524163 doi "https://doi.org/10.1093/pasj/65.4.88" @default.
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