Time Lags of Z Source GX 5-1

Details Time Lags of Z Source GX 5-1 Time Lags of Z Source GX 5-1

2004-02-25

arxiv.org/abs/astro-ph/0402590v1

Astrophys.Space Sci. 293 (2004) 441-451

Astronomy and Astrophysics

Astrophysics

15 pages, 8 figures, accepted for publication in ApSS

Scientific paper

10.1023/B:ASTR.0000044620.04676.

We investigated the time lags and the evolution of the cross spectra of Z source GX~5-1, observed by the Rossi X-ray Timing Explorer (RXTE), when it is in the horizontal branch oscillations. We showed that the time lags of 3 horizontal branch oscillations are related to the position on the hardness intensity diagram. All of the three QPOs were shown to have hard time lags. However on the cross spectra, one is in a `dip', one in a `bump', the other has no so obvious characteristic. The time lags of two of the QPOs decrease with QPO's frequency, while the other has a trend increasing with its frequency. Moreover, in the normal branch, we found no significant time lags in the present observational data.

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