Steady Models of Magnetically Supported Black Hole Accretion Disks

Details Steady Models of Magnetically Supported Black Hole Accretion Disks Steady Models of Magnetically Supported Black Hole Accretion Disks

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..968..408o&link_type=abstract

ASTROPHYSICS OF COMPACT OBJECTS: International Conference on Astrophysics of Compact Objects. AIP Conference Proceedings, Volum

Astronomy and Astrophysics

Astrophysics

Accretion And Accretion Disks, Black Holes, Magnetohydrodynamics And Plasmas

Scientific paper

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.

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