Of NBOs and kHz QPOs: a low-frequency modulation in resonant oscillations of relativistic accretion disks

Details Of NBOs and kHz QPOs: a low-frequency modulation in resonant oscillations of relativistic accretion disks Of NBOs and kHz QPOs: a low-frequency modulation in resonant oscillations of relativistic accretion disks

2004-08-04

arxiv.org/abs/astro-ph/0408090v1

Publ.Astron.Soc.Jap. 56 (2004) 819-822

Astronomy and Astrophysics

Astrophysics

Accepted for publication in PASJ; 4 pages, 1 figure

Scientific paper

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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