Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924704b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #247.04
Astronomy and Astrophysics
Astronomy
Scientific paper
It is now widely accepted that accretion onto black holes is driven by magnetohydrodynamic turbulence arising from the magnetorotational instability (MRI). This turbulence is often associated with fluctuations on timescales shorter than the orbital timescale and spatial correlations that are small compared to the disk scale height, consistent with expectations arising from a local picture of angular momentum transport. We present results from recent high resolution simulations of magnetized accretion disks in the local, mesoscale and global limits that demonstrate that while magnetized accretion disk turbulence possesses a strong local component, correlations in the magnetic field on size scales much greater than the disk scale height emerge naturally from the turbulence itself. These correlations play an important role in angular momentum transport, disk variability and the formation of density fluctuations on large spatial scales within the disk. Careful study of the convergence properties of these long wavelength correlations from the local to mesoscale limits fails to reveal a spatial scale on which the magnetic field de-correlates, suggesting that angular momentum transport in magnetized accretion disks is a global, rather than local phenomenon.
Armitage Philip J.
Beckwith Kris
Simon Jacob B.
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