AM05-08-003 2次元輻射流体シミュレーションによる降着円盤の緩和振動(宇宙流体1,一般講演)

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概要

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• We investigate the time evolution of luminous accretion disks around the black hole based on the two-dimensional radiation-hydrodynamic simulations. Our model can reproduce the limit-cycle oscillations between high- and low-luminosity states. The luminosity suddenly rises from 0.3L_E to 2L_E, retains high value for about 40s, and then decays, where L_E is the Eddington luminosity. Our limit-cycle oscillation model can explain the observations of maicroquasar, GRS 1915+105. We show in the high-luminosity state that the trapped luminosity is comparable to the luminosity, and the outflow is driven by the strong radiation force. We manifest that the limit-cycle behavior is cauased by the disk instability in the radiation-pressure dominant region by reproducing the prediction of the accretion disk theory, in which the disk is stabilized if the mass accretion rate is much larger than the critical value or the viscous stress tensor is proportional to the gas pressure only.

• 日本流体力学会の論文
• 2005-09-05

著者

• 大須賀 健

  立教大学

関連論文

• AM05-08-003 2次元輻射流体シミュレーションによる降着円盤の緩和振動(宇宙流体1,一般講演)
• 27aXA-4 Relaxation Oscillations of Accretion Disks by 2D Radiation Hydrodynamical Simulations(プラズマ宇宙物理(非線形現象1),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))

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