Quasi-Periodic Oscillations from Magnetorotational Turbulence

Abstract

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.

arXiv comment4 pages, 2 figures. submitted to apj

References in corpus (8)

• A New Simple Model for High Frequency Quasi Periodic Oscillations in Black Hole Candidates
• Relativistic Diskoseismology
• Non-linear resonance in the accretion disk of a millisecond pulsar
• Global General Relativistic Magnetohydrodynamic Simulations of Accretion Tori
• Resonance in Forced Oscillations of an Accretion Disk and Kilohertz Quasi Periodic Oscillations
• Turbulence and its parameterization in accretion discs
• Excitation of low-frequency QPOs in black-hole accretion
• Accretion Disc Turbulence and the X-Ray Power Spectra of Black Hole High States

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