Lin YF, Boutelier M, Barret D, Zhang SN (2011) Studying Frequency Relationships of Kilohertz Quasi-periodic Oscillations
for 4U 163653 and Sco X-1: Observations Confront Theories.
Interestingly, when eigen values occur in pairs (nearly equal values), they are indicative of quasi-periodic oscillations
present in the original time series.
Intensity-dependent quasi-periodic oscillations
in the X-ray flux of GX5-1.
First, I will develop an accretion disc model for the most luminous states of stellar mass black holes, including their high frequency quasi-periodic oscillations
, motivated by simulations.
From the figures we observe a quasi-periodic oscillations
in the conductance (Fig.
Israel (Rome Astronomical Observatory, Italy) discovered quasi-periodic oscillations
(QPOs) in the fading emission of the December 27, 2004, giant flare ("quasi-periodic" means that the vibrations have a narrow range of frequencies centered on one frequency).
A more abstruse mass estimate is possible for rapidly rotating X-ray pulsars, some of which display quasi-periodic oscillations
with time scales of 3 milliseconds and less.