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  On the development of quasi-periodic oscillations in Bondi–Hoyle accretion flows

Dönmez, O., Zanotti, O., & Rezzolla, L. (2011). On the development of quasi-periodic oscillations in Bondi–Hoyle accretion flows. Monthly Notices of the Royal Astronomical Society, 412(3), 1659-1668. doi:10.1111/j.1365-2966.2010.18003.x.

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Genre: Zeitschriftenartikel
Andere : On the development of QPOs in Bondi-Hoyle accretion flows (Preprint)

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1010.1739 (Preprint), 699KB
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 Urheber:
Dönmez, Orhan, Autor
Zanotti, Olindo, Autor
Rezzolla, Luciano1, Autor           
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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Schlagwörter: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
 Zusammenfassung: 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.

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 Datum: 2010-10-082011-04-112011
 Publikationsstatus: Erschienen
 Seiten: 11 pages, 7 figures
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Titel: Monthly Notices of the Royal Astronomical Society
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Oxford : Blackwell Science
Seiten: - Band / Heft: 412 (3) Artikelnummer: - Start- / Endseite: 1659 - 1668 Identifikator: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150