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Of NBOs and kHz QPOs: a Low-Frequency Modulation in Resonant Oscillations of Relativistic Accretion Disks

Journal article
Authors Jíri Horák
Marek A Abramowicz
Vladimír Karas
Wlodzimierz Kluzniak
Published in Publications of the Astronomical Society of Japan
Volume 56
Issue 5
Pages 819-822
ISSN 0004-6264
Publication year 2004
Published at Department of Physics (GU)
Pages 819-822
Language en
Subject categories Physical Sciences, Astronomy, Astrophysics and Cosmology

Abstract

The origin of quasi-periodic modulations of flux in the kilohertz range (kHz QPOs), observed in low-mass X-ray binaries, is usually assumed to be physically distinct from that of the "normal branch oscillations" (NBOs) in the Z-sources. We show that a low-frequency modulation of the kHz QPOs is a natural consequence of the non-linear relativistic resonance suggested previously to explain the properties of the high-frequency twin peaks. The theoretical results discussed here are reminiscent of the 6 Hz variations of frequency and amplitude of the kHz QPOs reported by Yu, van der Klis, and Jonker (2001).

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