9 papers
The distribution of kHz QPO frequencies in Sco X-1
Tomaso Belloni, Mariano Mendez, Jeroen Homan
The frequencies of kHz Quasi-Periodic Oscillations in the bright Low-Mass X-ray Binary Sco X-1 have been reported to appear preferentially in a 3:2 ratio. We show that a proper sta…
Kilohertz quasi-periodic oscillations and strong field gravity in X-ray binaries
Mariano Mendez
In the past five years observations with the Rossi X-ray Timing Explorer have revealed fast quasi-periodic oscillations in the X-ray flux of about 20 X-ray binaries. Thought to ori…
First observation of a transition between "parallel tracks" in the kHz QPO frequency vs. intensity diagram
Mariano Mendez
Contrary to theoretical expectations, observations with the Rossi X-ray Timing Explorer (RXTE) show that in X-ray binaries timing properties are not uniquely correlated with X-ray…
Fast X-ray Oscillations and General Relativity effects in Neutron star systems
Mariano Mendez
Kilohertz quasi-periodic oscillations (kHz QPOs) are probably caused by matter in Keplerian orbit at some preferred radius in the accretion disc around a compact star. In a given s…
Discovery of a kHz QPO in 2S 0918-549
Peter G. Jonker, Michiel van der Klis, Jeroen Homan +6
We report the discovery of a kilohertz quasi-periodic oscillation (kHz QPO) in the low-mass X-ray binary (LMXB) 2S 0918-549. The kHz QPO has a frequency of 1156+-9 Hz, a FWHM of 70…
Discovery of a new, third kHz QPO in 4U 1608-52, 4U 1728-34, and 4U 1636-53. Sidebands to the lower kHz QPO?
Peter G. Jonker, Mariano Mendez, Michiel van der Klis
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 (6.3 sigma), 4U 1728-34 (6.0 sigma)…