Entropic-acoustic instability of shocked Bondi accretion I. What does perturbed Bondi accretion sound like ?

Details Entropic-acoustic instability of shocked Bondi accretion I. What does perturbed Bondi accretion sound like ? Entropic-acoustic instability of shocked Bondi accretion I. What does perturbed Bondi accretion sound like ?

2001-01-04

arxiv.org/abs/astro-ph/0101056v1

Astronomy and Astrophysics

Astrophysics

14 pages, 11 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20000506

In the radial flow of gas into a black hole (i.e. Bondi accretion), the infall of any entropy or vorticity perturbation produces acoustic waves propagating outward. The dependence of this acoustic flux on the shape of the perturbation is investigated in detail. This is the key process in the mechanism of the entropic-acoustic instability proposed by Foglizzo & Tagger (2000) to explain the instability of Bondi-Hoyle-Lyttleton accretion. These acoustic waves create new entropy and vorticity perturbations when they reach the shock, thus closing the entropic-acoustic cycle. With an adiabatic index 1

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