Model QPO power spectra - Signatures of angular position and radial velocity of clumps in the boundary layer

Astronomy and Astrophysics – Astronomy

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Boundary Layers, Power Spectra, Radial Velocity, X Ray Sources, Galactic Bulge, Magnetic Effects, Oscillations, Phase Shift, Spectral Signatures

Scientific paper

Model power spectra are constructed for quasi-periodic oscillations of the type observed in some galactic bulge X-ray sources. It is shown that the angular location of clumping in the boundary layer, as well as the spread in Keplerian velocities within the boundary layer, will effect the form of the power spectrum under certain conditions. The occurrence of such features in observed power spectra would yield information on the possible role of the magnetic field in clumping and on the radial velocity of matter moving through the boundary layer.

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