Abstract
We show the results of two-dimensional and general-relativistic simulations of Bondi-Hoyle accretion flows onto a rotating black hole, revealing the exist ence of quasi-periodic oscillations (QPOs) in the shock cone that develops in the downstream part of the flow. The frequencies of these modes depend on the black-hole spin and on the properties of the flow, and scale linearly with the inverse of the black-hole mass. Our results may be relevant for explaining the detection of QPOs in Sagittarius A � , once such detection is confirmed by further observations. W e also report the first numerical evidence for the occurrence of the flip-flop instability, which can affect the shock cone, in a relativistic Bondi-Hoyle.
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