Resonance in forced oscillations of an accretion disk and kHz QPOs - INSPIRE

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Resonance in forced oscillations of an accretion disk and kHz QPOs

Feb, 2004

6 pages

Published in:

Astrophys.J.Lett. 603 (2004) L93-L96

e-Print:

astro-ph/0402084 [astro-ph]

DOI:

10.1086/383245

View in:

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Abstract: (arXiv)

We have performed numerical simulations of a radially perturbed accretion torus around a black hole or neutron star and find that the torus performs radial and vertical motions at the appropriate epicyclic frequencies. We find clear evidence that vertical motions are excited in a non-linear resonance when the applied perturbation is periodic in time. The strongest resonant response occurs when the frequency difference of the two oscillations is equal to one-half the forcing frequency, precisely as recently observed in the accreting pulsar, SAX J1808.4-3658, where the observed kHz QPO peak separation is half the spin frequency of 401 Hz.

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