2005/10/23 by Gabriel Török, G. Török, Gabriel Torok · 4 citations
Engineering · Physics and Astronomy · #Accretion (finance) #Accretion disc #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Atomic physics #Black hole (networking) #Galaxy #Mechanics and Biomechanics Studies #Physics #Pulsars and Gravitational Waves Research #Resonance (particle physics) #Spin (aerodynamics) #astro-ph
paper · pdf · doi:10.1002/asna.200510427
published as Astron.Nachr.9:856-860,2005 · 5 pages, 5 figures, 3 tables
arxiv created 2005/10/23 · openalex publication_date 2005/10/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract In all four microquasars which show double peak kHz QPOs, the ratio of the two frequencies is 3:2. This strongly supports the suggestion that twin peak kHz QPOs are due to a resonance between some modes of accretion disk oscillations. Here, we stress that fits to observations of the hypothetical resonances between vertical and radial epicyclic frequencies (particularly of the parametric resonance) give an accurate estimate of the spin for the three microquasars with known mass. Measurement of double peak QPOs frequencies in the Galaxy centre seems also to be consistent with the 3:2 ratio established by previous observations in microquasars, however the SgrA* data are rather difficult for the same exact analysis. If confirmed, the 3:2 ratio of double peak QPOs in SgrA* would be of a fundamental importance for the black hole accretion theory and the precise measurement could help to solve the question of QPOs nature. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)