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Search: LAR1:gu > (2004) > Conference paper

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  • Abramowicz, Marek A, 1945, et al. (author)
  • Interpreting black hole QPOs
  • 2004
  • In: AIP Conference Proceedings. - 0094-243X. ; 714, s. 21-28
  • Conference paper (other academic/artistic)abstract
    • n all the microquasars with two hHz QPOs, the ratio of the frequencies is 3:2, supporting our suggestion that a non-linear resonance between two modes of oscillation in the accretion disk plays a role in exciting the observed modulations of the X-ray flux. We discuss the evidence in favor of this interpretation, and we relate the black hole spin to the frequencies expected for various types of resonances that may occur in nearly Keplerian disks in strong gravity. For those microquasars where the mass of the central X-ray source is known, the black hole spin can be deduced from a comparison of the observed and expected frequencies.
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  • Abramowicz, Marek A, 1945, et al. (author)
  • Twin peak QPOs frequencies in microquasars and Sgr A*. The resonance and other orbital models
  • 2004
  • In: Proceedings of RAGtime 4/5 Workshops on black holes and neutron stars, 14-16/13-15 October 2002/2003. - 8072482424
  • Conference paper (other academic/artistic)abstract
    • In all four microquasars which show twin peak kHz QPOs, the ratio of the two frequencies is 3:2. This rather strongly supports the suggestion by Abramowicz, M. A. and Kluzniak [W. Abramowicz, M. A. and Kluzniak, W., (2001). A precise determination of black hole spin in GRO J1655-40. Astronomy and Astrophysics, 374:L19] that twin peak kHz QPOs are due to a resonance between some modes of accretion disk oscillations. Detailed studies of this suggestion revealed that several such non-linear resonances are present in nearly Keplerian disks in strong gravity. Here, we fit to observations predictions of the resonance hypothesis for two particular types of non-linear resonances between vertical and radial epicyclic frequencies. For three microquasars with known masses, the fits give an accurate estimate of the spin.
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  • Result 1-10 of 640
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peer-reviewed (364)
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pop. science, debate, etc. (2)
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Båth, Magnus, 1974 (20)
Månsson, Lars Gunnar ... (16)
Håkansson, Markus (15)
Gärling, Tommy, 1941 (12)
Blomstrand, Christia ... (11)
Thomsen, Peter, 1953 (11)
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Fahlke, Claudia, 196 ... (9)
Mattsson, Sören (8)
Söderbaum, Fredrik, ... (8)
Tingberg, Anders (8)
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Persson Waye, Kersti ... (7)
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Berggren, Ulf, 1948 (6)
Sjöstrand, Johan, 19 ... (6)
Winkel, Jörgen, 1946 (6)
Esposito, Marco, 196 ... (6)
Sandsjö, Leif, 1958 (6)
Erickson, Gudrun, 19 ... (6)
Claesson, Lisbeth, 1 ... (6)
Byström, Pernilla, 1 ... (6)
Matzke, M. (6)
Staron, Miroslaw, 19 ... (5)
Blennow, Kaj, 1958 (5)
Mäkitalo, Åsa, 1966 (5)
Lundälv, Jörgen, 196 ... (5)
Abrahamsson, Jonas, ... (5)
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Petersen, Anne, 1962 (5)
Meyer, W. (5)
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Åberg, Helena, 1955 (5)
Stenmark, Dick, 1962 (5)
Bergström, Ola, 1968 (5)
Magnusson, Johan, 19 ... (5)
Lingefjärd, Thomas, ... (5)
Carlsson, Ninni, 196 ... (5)
Grimme, L H (5)
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Social Sciences (275)
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Humanities (86)
Engineering and Technology (13)
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