On the kHz QPO frequency correlations in bright neutron star X-ray binaries

2007/02/06 by T. Belloni, M. Mendez, J. Homan
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Pulsars and Gravitational Waves Research #astro-ph

paper · pdf · doi:10.1111/j.1365-2966.2007.11486.x

published as Mon.Not.Roy.Astron.Soc.376:1133-1138,2007 · Accepted for publication in MNRAS; 7 pages, 4 figures

arxiv created 2007/02/06 · openalex publication_date 2007/02/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

Abstract

We re-examine the correlation between the frequencies of upper and lower kHz quasi-periodic oscillations (QPO) in bright neutron star low-mass X-ray binaries. By including the kHz QPO frequencies of the X-ray binary Cir X-1 and two accreting millisecond pulsars in our sample, we show that the full sample does not support the class of theoretical models based on a single resonance, while models based on relativistic precession or Alfvén waves describe the data better. Moreover, we show that the fact that all sources follow roughly the same correlation over a finite frequency range creates a correlation between the linear parameters of the fits to any subsample.

Citations

• Quasi‐periodic Oscillations Associated with Spectral Branches inRossi X‐Ray Timing ExplorerObservations of Circinus X‐1
• RXTEObservations of the Neutron Star Low‐Mass X‐Ray Binary GX 17+2: Correlated X‐Ray Spectral and Timing Behavior
• Evidence for a 2:3 resonance in Sco X-1 kHz QPOs
• Relations between Timing Features and Colors in Accreting Millisecond Pulsars
• Timing Features of the Accretion‐driven Millisecond X‐Ray Pulsar XTE J1807−294 in the 2003 March Outburst