Rapid variability of the kHz-QPO frequency in 4U1608-52

Details Rapid variability of the kHz-QPO frequency in 4U1608-52 Rapid variability of the kHz-QPO frequency in 4U1608-52

2004-12-16

arxiv.org/abs/astro-ph/0412421v1

Astronomy and Astrophysics

Astrophysics

Proceedings of the Annual meeting of the French Astronomical Society (SF2A), in press, 4 pages, 4 figures

Scientific paper

We investigate the variability of the QPO frequency in 4U1608-52 on very short time scales of a few seconds. We detect changes in frequency as fast as 0.5 Hz/s, which is more than ten times the fastest change reported for this object. Using a structure function analysis, we are able to detect variability on time scales as short as ~4 seconds. We do not detect any time asymmetry in the QPO-frequency history. These results have important consequences on the measurement of the QPO coherence.

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