Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0174b&link_type=abstract
American Astronomical Society, HEAD meeting #9, #1.74; Bulletin of the American Astronomical Society, Vol. 38, p.341
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results on the existence of discrete features in the power
spectra of fluid variables in simulations of magnetorotational turbulence.
The simulations are of two types. First, we examine the existence of
hydrodynamic standing waves on top of the turbulence in local shearing boxes.
We find in general that inertial waves (g-modes) are destroyed by the
turbulence, but acoustic waves (p-modes) may sometimes be present, depending
on the strength of the turbulence which in turn is determined by the initial
magnetic field geometry. We also explore the effects of photon diffusion
induced compressibility in the turbulence on the wave modes. Second, we
examine global modes of oscillation in the small inner tori produced in
high resolution global GRMHD simulations of black hole accretion flows.
Despite the magnetorotational turbulence that exists in these flows, there
is a very strong discrete feature in the power spectrum. We discuss the
relevance of these results to observed QPO's in X-ray binaries.
This work was supported in part by grants PHY99-07949 and AST 03-07657 from
the National Science Foundation.
Arras Phil
Blaes Omer M.
Fragile P.
Henisey K.
Turner Neal
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