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Time Lags of Horizontal Branch Oscillations in Z Source GX 5–1

Published online by Cambridge University Press:  26 May 2016

Jin-Lu Qu ,
Guo-Qiang Ding ,
Jian-Feng Ji  and
Ming-Xuan Zhang
Jin-Lu Qu
Affiliation:
Laboratory for High Energy Astrophysics, Institute of High Energy Physics, CAS, Beijing 100039, P. R. China
Guo-Qiang Ding
Affiliation:
Laboratory for High Energy Astrophysics, Institute of High Energy Physics, CAS, Beijing 100039, P. R. China
Jian-Feng Ji
Affiliation:
Depart of Engineering Physics, Tsinghua University, Beijing 100084, P. R. China
Ming-Xuan Zhang
Affiliation:
Laboratory for High Energy Astrophysics, Institute of High Energy Physics, CAS, Beijing 100039, P. R. China

Abstract

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We investigated the time lags and the evolution of the cross spectrua of Z source GX 5-1, observed by 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. 3 QPOs were shown to be of the hard time lags. But on the cross spectra, one is in a “dip”, one in a “bump”, another has not that chracteristic. The time lags of two of the QPOs decrease with QPO's frequency, and one has a trend increasing with its freuqency. In the normal branch, we found that there is no significant time lags in the present observational data.

Type
Part 6 X-Ray Binaries
Information
Symposium - International Astronomical Union , Volume 214: High Energy Processes and Phenomena in Astrophysics , 2003 , pp. 231 - 235
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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