Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-10-08
MNRAS 412 3 1659-1668 (2011)
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
11 pages, 7 figures
Scientific paper
10.1111/j.1365-2966.2010.18003.x
The numerical investigation of Bondi-Hoyle accretion onto a moving black hole has a long history, both in Newtonian and in general-relativistic physics. By performing new two-dimensional and general-relativistic simulations onto a rotating black hole, we point out a novel feature, namely, that quasi-periodic oscillations (QPOs) are naturally produced in the shock cone that develops in the downstream part of the flow. Because the shock cone in the downstream part of the flow acts as a cavity trapping pressure perturbations, modes with frequencies in the integer ratios 2:1 and 3:1 are easily produced. 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. Finally, we report on the development of the flip-flop instability, which can affect the shock cone under suitable conditions; such an instability has been discussed before in Newtonian simulations but was never found in a relativistic regime.
Donmez Orhan
Rezzolla Luciano
Zanotti Olindo
No associations
LandOfFree
On the development of QPOs in Bondi-Hoyle accretion flows does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the development of QPOs in Bondi-Hoyle accretion flows, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the development of QPOs in Bondi-Hoyle accretion flows will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-486910