On the development of QPOs in Bondi-Hoyle accretion flows

Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

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.

Rate now

     

Profile ID: LFWR-SCP-O-486910

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.