Quasi-Periodic Oscillations from Magnetorotational Turbulence

Details Quasi-Periodic Oscillations from Magnetorotational Turbulence Quasi-Periodic Oscillations from Magnetorotational Turbulence

2006-02-13

arxiv.org/abs/astro-ph/0602275v1

Astrophys.J. 645 (2006) L65-L68

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. submitted to apj

Scientific paper

10.1086/505966

Quasi-periodic oscillations (QPOs) in the X-ray lightcurves of accreting neutron star and black hole binaries have been widely interpreted as being due to standing wave modes in accretion disks. These disks are thought to be highly turbulent due to the magnetorotational instability (MRI). We study wave excitation by MRI turbulence in the shearing box geometry. We demonstrate that axisymmetric sound waves and radial epicyclic motions driven by MRI turbulence give rise to narrow, distinct peaks in the temporal power spectrum. Inertial waves, on the other hand, do not give rise to distinct peaks which rise significantly above the continuum noise spectrum set by MRI turbulence, even when the fluid motions are projected onto the eigenfunctions of the modes. This is a serious problem for QPO models based on inertial waves.

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