DISTINGUISHING BETWEEN SPOT AND TORUS MODELS OF HIGH-FREQUENCY QUASIPERIODIC OSCILLATIONS

Authors

  • Vladimír Karas Astronomical Institute, Boční II 1401, CZ-14100 Prague
  • Pavel Bakala Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, CZ-74601 Opava
  • Gabriel Török Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, CZ-74601 Opava
  • Michal Dovčiak Astronomical Institute, Boční II 1401, CZ-14100 Prague
  • Martin Wildner Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, CZ-74601 Opava
  • Dalibor Wzientek Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, CZ-74601 Opava
  • Eva Šrámková Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, CZ-74601 Opava
  • Marek Abramowicz Physics Department, Gothenburg University, SE-412 96 Göteborg
  • Kateřina Goluchová Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, CZ-74601 Opava
  • Grzegorz P. Mazur Copernicus Astronomical Center, ul. Bartycka 18, PL-00 716 Warszawa
  • Frédéric H. Vincent Laboratoire AstroParticule et Cosmologie, CNRS, Université Paris Diderot, 10 rue Alice Domon et Leonie Duquet, 75205, Paris Cedex 13

DOI:

https://doi.org/10.14311/AP.2014.54.0191

Abstract

In the context of high-frequency quasi-periodic oscillation (HF QPOs) we further explore the appearance of an observable signal generated by hot spots moving along quasi-elliptic trajectories close to the innermost stable circular orbit in the Schwarzschild spacetime. The aim of our investigation is to reveal whether observable characteristics of the Fourier power-spectral density can help us to distinguish between the two competing models, namely, the idea of bright spots orbiting on the surface of an accretion torus versus the scenario of intrinsic oscillations of the torus itself. We take the capabilities of the present observatories (represented by the Rossi X-ray Timing Explorer, RXTE) into account, and we also consider the proposed future instruments (represented here by the Large Observatory for X-ray Timing, LOFT).

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Published

2014-06-27

Issue

Vol. 54 No. 3 (2014)

Section

Articles

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How to Cite

Karas, V., Bakala, P., Török, G., Dovčiak, M., Wildner, M., Wzientek, D., Šrámková, E., Abramowicz, M., Goluchová, K., Mazur, G. P., & Vincent, F. H. (2014). DISTINGUISHING BETWEEN SPOT AND TORUS MODELS OF HIGH-FREQUENCY QUASIPERIODIC OSCILLATIONS. Acta Polytechnica, 54(3), 191-196. https://doi.org/10.14311/AP.2014.54.0191