Do High Frequency QPOs Depend on Phase of Low Frequency QPOs in XTE J1550-564 ?

Details Do High Frequency QPOs Depend on Phase of Low Frequency QPOs in XTE J1550-564 ? Do High Frequency QPOs Depend on Phase of Low Frequency QPOs in XTE J1550-564 ?

2002-07-30

arxiv.org/abs/astro-ph/0207645v1

Astronomy and Astrophysics

Astrophysics

3 pages, 1 figure, to appear in the Proceedings of the 4th Microquasar Workshop, eds. Ph Durouchoux, Y. Fuchs and J. Rodriguez

Scientific paper

We have studied the dependence of the high frequency Quasi-periodic Oscillation (QPO) (~284 Hz) on the phase of the low frequency QPO (~6 Hz) in the black hole X-ray binary XTE J1550-564 in the observations of the Rossi X-ray Timing Explorer (RXTE) performed on MJD 51241. By selecting the local maxima and the local minima in the light curve on the 6 Hz QPO time scale, we have found the corresponding high frequency QPO frequencies are consistent within 1.5 sigma. However, the average central QPO frequency of the maxima and the minima is about 2.0 sigma lower than the average high frequency QPO frequency obtained in the entire observation. This marginally suggests that the high frequency QPOs probably varies in frequency on short time scales. We briefly discuss these results and their consequences.

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