A ug 2 00 0 Discovery of a new , third kHz QPO in 4 U 1608 – 52 , 4 U 1728 – 34 , and 4 U 1636 – 53 Sidebands to the lower kHz QPO ?

Abstract

We report the discovery of a third kilohertz quasi–periodic oscillation (kHz QPO) in the power spectra of the low–mass X–ray binaries 4U 1608–52 (6.3σ), 4U 1728–34 (6.0σ), and 4U 1636–53 (3.7σ) which is present simultaneously with the previously–known kHz QPO pair. The new kHz QPO is found at a frequency that is 52.8±0.9 Hz, 64±2 Hz, 58.4±1.9 Hz higher than… (More)

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