Near-Infrared and X-ray Quasi-Periodic Oscillations in Numerical Models of Sgr A*

Details Near-Infrared and X-ray Quasi-Periodic Oscillations in Numerical Models of Sgr A* Near-Infrared and X-ray Quasi-Periodic Oscillations in Numerical Models of Sgr A*

2012-01-09

arxiv.org/abs/1201.1917v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

16 pages, 5 figures. Accepted for publication in ApJ Letters

Scientific paper

We report transient quasi-periodic oscillations (QPOs) on minute timescales in relativistic, radiative models of the galactic center source Sgr A*. The QPOs result from nonaxisymmetric $m=1$ structure in the accretion flow excited by MHD turbulence. Near-infrared (NIR) and X-ray power spectra show significant peaks at frequencies comparable to the orbital frequency at the innermost stable circular orbit (ISCO) $f_o$. The excess power is associated with inward propagating magnetic filaments inside the ISCO. The amplitudes of the QPOs are sensitive to the electron distribution function. We argue that transient QPOs appear at a range of frequencies in the neighborhood of $f_o$ and that the power spectra, averaged over long times, likely show a broad bump near $f_o$ rather than distinct, narrow QPO features.

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