To the top

Page Manager: Webmaster
Last update: 9/11/2012 3:13 PM

Tell a friend about this page
Print version

Of NBOs and kHz QPOs: a L… - University of Gothenburg, Sweden Till startsida
To content Read more about how we use cookies on

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


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).

Page Manager: Webmaster|Last update: 9/11/2012

The University of Gothenburg uses cookies to provide you with the best possible user experience. By continuing on this website, you approve of our use of cookies.  What are cookies?