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

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dc.contributor.authorDonmez, O.
dc.contributor.authorZanotti, O.
dc.contributor.authorRezzolla, L.
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2011
dc.departmentNiğde ÖHÜ
dc.description.abstractThe numerical investigation of the Bondi-Hoyle accretion on to 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 on to 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 of 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.
dc.description.sponsorshipNational Center for High Performance Computing of Turkey (UYBHM) [10022007]; DFG [SFB/Transregio 7]
dc.description.sponsorshipIt is a pleasure to thank Jose A. Font for carefully reading the manuscript and for very helpful comments. The numerical calculations were performed at the National Center for High Performance Computing of Turkey (UYBHM) under grant number 10022007 and TUBITAK ULAKBIM, High-Performance and Grid-Computing Center (TR-Grid e-Infrastructure). This work was supported in part by the DFG grant SFB/Transregio 7.
dc.identifier.doi10.1111/j.1365-2966.2010.18003.x
dc.identifier.endpage1668
dc.identifier.issn0035-8711
dc.identifier.issue3
dc.identifier.scopus2-s2.0-79953297490
dc.identifier.scopusqualityQ1
dc.identifier.startpage1659
dc.identifier.urihttps://dx.doi.org/10.1111/j.1365-2966.2010.18003.x
dc.identifier.urihttps://hdl.handle.net/11480/4735
dc.identifier.volume412
dc.identifier.wosWOS:000289159100017
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherWILEY-BLACKWELL
dc.relation.ispartofMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectblack hole physics
dc.subjecthydrodynamics
dc.subjectshock waves
dc.subjectGalaxy: disc hydrodynamics
dc.titleOn the development of quasi-periodic oscillations in Bondi-Hoyle accretion flows
dc.typeArticle

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