Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-25
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.
Chen Leon L.
Chen Yafeng
Qu Jin Lu
Song Li Ming
Wu Min
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