Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-05-05
Astrophys.J.703:717-720,2009
Astronomy and Astrophysics
Astrophysics
12 pages, 4 figures, submitted to ApJ
Scientific paper
10.1088/0004-637X/703/1/717
The detection of fast quasi-periodic variability from accreting black holes and neutron stars has been used to constrain their masses, radii, and spins. If the observed oscillations are linear modes in the accretion disks, then bounds can be placed on the properties of the central objects by assuming that these modes are locally sub-Keplerian. If, on the other hand, the observed oscillations correspond to non-linear resonances between disk modes, then the properties of the central objects can be measured by assuming that the resonant modes are excited at the same radial annulus in the disk. In this paper, we use numerical simulations of vertically integrated, axisymmetric hydrodynamic accretion disks to provide examples of situations in which the assumptions implicit in both methods are not satisfied. We then discuss our results for the robustness of the mass and spin measurements of compact objects from variability studies.
Mao Sui Ann
Milsom John A.
Psaltis Dimitrios
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