Steady models of magnetically supported black hole accretion disks

Hiroshi Oda, Mami Machida, Kenji E. Nakamura, Ryoji Matsumoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish
Title of host publicationAstrophysics of Compact Objects - International Conference on Astrophysics of Compact Objects
Number of pages3
Publication statusPublished - 2008
Externally publishedYes
EventInternational Conference on Astrophysics of Compact Objects - Huangshan City, China
Duration: Jul 1 2007Jul 7 2007

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


OtherInternational Conference on Astrophysics of Compact Objects
CityHuangshan City

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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