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KiloHertz Quasi-Periodic Oscillations in the Z sources GX 340+0, Cygnus X-2, GX 17+2, GX 5-1, and Scorpius X-1
Rudy Wijnands, Michiel van der Klis
We have discovered kiloHertz quasi-periodic oscillations (kHz QPOs) in five Z sources: GX 340+0, Cygnus X-2, GX 17+2, GX 5-1, and Scorpius X-1. In all sources the properties of the…
Discovery of microsecond time lags in kilohertz QPO
Brian A. Vaughan, Michiel van der Klis, Mariano Mendez +7
Using the Rossi X-ray Timing Explorer we have measured 27 microsecond time delays in 830 Hz quasi-periodic oscillations (QPO) between 4-6 keV and 11-17 keV in 4U 1608-52, with high…
Kilohertz QPO Peak Separation Is Not Constant in Scorpius X-1
Michiel van der Klis, Rudy A. D. Wijnands, Keith Horne +1
We report on a series of twenty ~10^5 c/s, 0.125 msec time-resolution RXTE observations of the Z source and low-mass X-ray binary Scorpius X-1. Twin kilohertz quasi-periodic oscill…