The Harmonic and Sideband Structure of the Kilohertz Quasi-Periodic Oscillations in Sco X-1

Details The Harmonic and Sideband Structure of the Kilohertz Quasi-Periodic Oscillations in Sco X-1 The Harmonic and Sideband Structure of the Kilohertz Quasi-Periodic Oscillations in Sco X-1

2000-06-19

arxiv.org/abs/astro-ph/0006243v1

Mon.Not.Roy.Astron.Soc. 318 (2000) 938

Astronomy and Astrophysics

Astrophysics

To appear in MNRAS (5 pages; 2 figures)

Scientific paper

10.1046/j.1365-8711.2000.03788.x

We use data from the Rossi X-ray Timing Explorer to search for harmonics and sidebands of the two simultaneous kilohertz quasi-periodic oscillations (kHz QPOs) in Sco X-1. We do not detect any of these harmonics or sidebands, with 95% confidence upper limits to their power between ~ 1% and ~ 10% of the power of the upper kHz QPO. The oscillations produced at these frequencies may be attenuated in a scattering corona around the neutron star. We find that upper limits to the unattenuated power of some of the strongest theoretically predicted harmonics and sidebands are as low as ~ 2% of the unattenuated power of the high-frequency QPO in Sco X-1.

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