Steady Models of Magnetically Supported Black Hole Accretion Disks
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. W assumed 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.
accretion accretion disks black holes state transition MHD RMHD
Hiroshi Oda Mami Machida Kenji E. Nakamura Ryoji Matsumoto
Graduate School of Science and Technology, Chiba University, 1-33 Yayoi-Cho, Inage-Ku, Chiba 263-852 Division of Theoretical Astronomy, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Department of Sciences, Matsue National College of Technology, 14-4 Nishiikuma-Cho, Matsue, Shimane Department of Physics, Faculty of Science, Chiba University, 1-33 Yayoi-Cho, Inage-Ku, Chiba 263-852
国际会议
紧凑型物体的天体物理学国际会议(International Conference on Astrophysics of Compact Objects)
安徽黄山
英文
408-410
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）