Time Lags of Z Source GX 5-1

Abstract

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.

15 pages, 8 figures, accepted for publication in ApSS

References in corpus (7)

• RXTE Observation of Cygnus X-1: II. Timing Analysis
• Low and high frequency variability as a function of spectral properties in the bright X-ray binary GX 5-1
• RXTE Observation of Cygnus X--1: III. Implications for Compton Corona and ADAF Models
• A New Model for the Hard Time Lags in Black Hole X-Ray Binaries
• A Comptonization Model for Phase Lag Variability in GRS 1915+105
• The Cross-Spectra of Cir X-1: Evolution of Time Lags
• Low Frequency Coherence Break in The Soft X-ray State of GRS 1915+105

Cited by in corpus (4)

• Constraining the Coronal Heights and Readjustment Velocities Based on the Detection of a Few Hundred Seconds Delays in the Z Source GX 17+2
• Correlated X-ray spectral and timing variability of the Be/X-ray binary V0332+53/BQ Cam during a type II outburst
• Determination of QPO properties in the presence of strong broad-band noise: a case study on the data of MAXI J1820+070
• The Cross Spectral Time lags evolution along branches in XTE J1701-462