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Title:
The Importance of Discovering a 3:2 Twin-Peak Quasi-periodic Oscillation in an Ultraluminous X-Ray Source, or How to Solve the Puzzle of Intermediate-Mass Black Holes
Authors:
Abramowicz, Marek A.; Kluźniak, Włodek; McClintock, Jeffrey E.; Remillard, Ronald A.
Affiliation:
AA(School of Physics, Chalmers University, S-412-96 Göteborg, Sweden ), AB(Institute of Astronomy, Zielona Góra University, Wieża Braniborska, Lubuska 2, PL-65-265 Zielona Góra, Poland; and Copernicus Astronomical Centre, Bartycka 18, PL-00-716 Warsaw, Poland ), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 ), AD(Center for Space Research, Massachusetts Institute of Technology, 70 Vassar Street, Building 37, Cambridge, MA 02139 )
Publication:
The Astrophysical Journal, Volume 609, Issue 2, pp. L63-L65. (ApJL Homepage)
Publication Date:
07/2004
Origin:
UCP
Astronomy Keywords:
Accretion, Accretion Disks, Black Hole Physics, Galaxies: Quasars: General, Relativity, X-Rays: Galaxies, X-Rays: General
DOI:
10.1086/422810
Bibliographic Code:
2004ApJ...609L..63A

Abstract

Recently, twin-peak quasi-periodic oscillations (QPOs) have been observed in a 3:2 ratio for three Galactic black hole microquasars with frequencies that have been shown to scale as 1/M, as expected for general relativisitic motion near a black hole. It may be possible to extend this result to distinguish between the following two disparate models that have been proposed for the puzzling ultraluminous X-ray sources (ULXs): (1) an intermediate-mass black hole (M~103 Msolar) radiating very near the Eddington limit and (2) a conventional black hole (M~10 Msolar) accreting at a highly super-Eddington rate with its emission beamed along the rotation axis. We suggest that one could discriminate between these models by detecting the counterpart of a Galactic twin-peak QPO in a ULX: the expected frequency for the intermediate-mass black hole model is only about 1 Hz, whereas for the conventional black hole model the expected frequency would be the ~100 Hz value observed for the Galactic microquasars.
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