Rapid variability of the kHz-QPO frequency in 4U1608-52
Astrophysics
2007-05-23 v1
Abstract
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.
Cite
@article{arxiv.astro-ph/0412421,
title = {Rapid variability of the kHz-QPO frequency in 4U1608-52},
author = {S. Paltani and D. Barret and J. F. Olive and G. K. Skinner},
journal= {arXiv preprint arXiv:astro-ph/0412421},
year = {2007}
}
Comments
Proceedings of the Annual meeting of the French Astronomical Society (SF2A), in press, 4 pages, 4 figures