Poster Title: Global Three-dimensional MHD Simulations of Co-existence of Hard State and Soft State Disks in Black Holes
Abstract: We present the results of three-dimensional global resistive magnetohydrodynamic (MHD) simulations of black hole accretion flows. General relativistic effects are simulated by using the pseudo-Newtonian potential. The initial state is an equilibrium model of a torus threaded by weak toroidal magnetic field. As the magneto-rotational instability (MRI) grows in the torus, mass accretes to the black hole by losing the angular momentum.
When the mass accretion rate is small enough, the disk stays in an ADAF blanch at all radius.As the mass accretion rate increases, ADAF blanch disappears outside some critical radius, above which the disk makes transition to an optically thisk, cold state. Hard-state disks in the inner region co-exists with soft-state disks in the outer region.
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