Journal Article

Axisymmetric Bondi–Hoyle accretion on to a Schwarzschild black hole: shock cone vibrations

F. D. Lora-Clavijo and F. S. Guzmán

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 429, issue 4, pages 3144-3154
Published in print March 2013 | ISSN: 0035-8711
Published online January 2013 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1093/mnras/sts573
Axisymmetric Bondi–Hoyle accretion on to a Schwarzschild black hole: shock cone vibrations

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We study numerically the axisymmetric relativistic Bondi–Hoyle accretion of a supersonic ideal gas on to a fixed Schwarzschild background space–time described with horizon penetrating coordinates. We verify that a nearly stationary shock cone forms and that the properties of the shock cone are consistent with previous results in Newtonian gravity and former relativistic studies. The fact that the evolution of the gas is tracked on a spatial domain that contains a portion of the inner part of the black hole avoids the need to impose boundary conditions on a time-like boundary as done in the past. Thus, our approach contributes to the solution to the Bondi–Hoyle accretion problem at the length-scale of the accretor in the sense that the gas is genuinely entering the black hole. As an astrophysical application, we study for a set of particular physical parameters, the spectrum of the shock cone vibrations and their potential association with Quasi Periodic Oscillations sources.

Keywords: Accretion, Accretion discs; black hole physics; hydrodynamics; shock waves

Journal Article.  7161 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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