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Distinguishing between spot and torus models of high-frequency quasiperiodic oscillations

Journal article
Authors V. Karas
P. Bakala
G. Török
M. Dovčiak
M. Wildner
D. Wzientek
E. Šrámková
Marek A Abramowicz
K. Goluchová
G. P. Mazur
F. H. Vincent
Published in Acta Polytechnica
Volume 54
Issue 3
Pages 191-196
ISSN 1210-2709
Publisher Czech Technical University
Publication year 2014
Published at Department of Physics (GU)
Pages 191-196
Language en
Links dx.doi.org/10.14311/AP.2014.54.0191
Keywords Accretion, Accretion disks, Black hole physics, X-rays: binaries
Subject categories Physical Sciences

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). © Czech Technical University in Prague, 2014.

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