TY - GEN
T1 - Steady models of magnetically supported black hole accretion disks
AU - Oda, Hiroshi
AU - Machida, Mami
AU - Nakamura, Kenji E.
AU - Matsumoto, Ryoji
PY - 2008
Y1 - 2008
N2 - We obtained steady solutions of magnetized black hole accretion disks taking into account the gas pressure, magnetic pressure, and radiation pressure.We assumed the bremsstrahlung cooling in the optically thin limit and the black body cooling in the optically thick limit.Wassumed that magnetic fields inside the disk are turbulent and dominated by azimuthal component and that the azimuthally averaged Maxwell stress is proportional to the total pressure. We found that when accretion rate exceeds the threshold for the onset of the thermal instability for optically thin disks, a magnetic pressure dominated, cool branch appears in the thermal equilibrium curve. This disk corresponds to the "Bright/Hard" state in black hole candidates observed during the transition from a Low/Hard state to a High/Soft state.
AB - We obtained steady solutions of magnetized black hole accretion disks taking into account the gas pressure, magnetic pressure, and radiation pressure.We assumed the bremsstrahlung cooling in the optically thin limit and the black body cooling in the optically thick limit.Wassumed that magnetic fields inside the disk are turbulent and dominated by azimuthal component and that the azimuthally averaged Maxwell stress is proportional to the total pressure. We found that when accretion rate exceeds the threshold for the onset of the thermal instability for optically thin disks, a magnetic pressure dominated, cool branch appears in the thermal equilibrium curve. This disk corresponds to the "Bright/Hard" state in black hole candidates observed during the transition from a Low/Hard state to a High/Soft state.
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U2 - 10.1063/1.2840442
DO - 10.1063/1.2840442
M3 - Conference contribution
AN - SCOPUS:72349086827
SN - 9780735404854
T3 - AIP Conference Proceedings
SP - 408
EP - 410
BT - Astrophysics of Compact Objects - International Conference on Astrophysics of Compact Objects
T2 - International Conference on Astrophysics of Compact Objects
Y2 - 1 July 2007 through 7 July 2007
ER -