Low-Frequency Oscillations in Global Simulations of Black Hole Accretion

Details Low-Frequency Oscillations in Global Simulations of Black Hole Accretion Low-Frequency Oscillations in Global Simulations of Black Hole Accretion

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21710507o&link_type=abstract

American Astronomical Society, AAS Meeting #217, #105.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of a numerical exploration of low-frequency variability in black hole accretion disks. Specifically, we have conducted a global, magnetohydrodynamic simulation of a thin, magnetized accretion flow that evolves for over 1,500 inner disk orbits. We have identified in this simulation the presence of dynamo cycles that manifest themselves predominantly as oscillations in the azimuthal magnetic field over timescales ten to twenty times longer than the local orbital period. Interestingly, these cycles occupy discrete frequencies that in many instances share power across broad radial ranges. We also connect the simulated dynamo cycles to several properties of observed low-frequency quasi-periodic oscillations in galactic black hole binary systems, noting that the cycles have the appropriate frequencies and narrow-band profiles and that they are located in a region associated with X-ray emission in real systems. This work clearly illustrates that magnetized disk dynamos can exhibit variability on timescales much longer than any timescale that would emerge from test particle considerations.
Funding for this work has been supplied by the NSF, NASA, and the Maryland-Goddard Joint Space Science Institute (JSI).

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