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Towards modeling quasi-periodic oscillations of microquasars with oscillating slender tori

Journal article
Authors G. P. Mazur
F. H. Vincent
Mats Johansson
E. Sramkova
G. Torok
P. Bakala
Marek A Abramowicz
Published in Astronomy & Astrophysics
Volume 554
Pages artikel nr A57
ISSN 0004-6361
Publication year 2013
Published at Department of Physics (GU)
Department of Computer Science and Engineering, Computing Science (GU)
Pages artikel nr A57
Language en
Keywords accretion, accretion disks, black hole physics, relativistic processes
Subject categories Astronomy, Astrophysics and Cosmology


Context. One of the often discussed models for high-frequency quasi-periodic oscillations of X-ray binaries is the oscillating torus model, which considers oscillation modes of slender accretion tori. Aims. Here, we aim at developing this model by considering the observable signature of an optically thick slender accretion torus subject to simple periodic deformations. Methods. We compute light curves and power spectra of a slender accretion torus subject to simple periodic deformations: vertical or radial translation, rotation, expansion, and shear. Results. We show that different types of deformations lead to very different Fourier power spectra and therefore could be observationally distinguished. Conclusions. This work is a first step in a longer term study of the observable characteristics of the oscillating torus model. It gives promising perspectives on the possibility of constraining this model by studying the observed power spectra of quasi-periodic oscillations.

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