The time-delay spectrum of GX 5-1 in its horizontal branch

Details The time-delay spectrum of GX 5-1 in its horizontal branch The time-delay spectrum of GX 5-1 in its horizontal branch

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421..738v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 421, no. 2, p. 738-752

Astronomy and Astrophysics

Astronomy

26

Astronomical Spectroscopy, Horizontal Branch Stars, Pulsars, Stellar Spectra, Time Lag, X Ray Astronomy, X Ray Binaries, X Ray Spectra, Compton Effect, Computerized Simulation, Ginga Satellite, Monte Carlo Method

Scientific paper

Using a cross-spectral technique we investigate time delays between intensity variations of GX 5-1 in 10 X-ray spectral channels. The data were taken during a 1989 Ginga observation during which the source was in its horizontal-branch spectral state. We develope a new method to measure 'time-delay spectra' in fixed Fourier frequency ranges and use it to determine the energy and intensity dependence of time delays in the low-frequency noise (nu less than 2 Hz), the horizontal branch quasi-periodic oscillations (QPO), and the QPO second harmonic. These are the first time-delay spectra of a Z-source in its horizontal branch, and the first detection of time delays in the second harmonic. We consider two mechanisms for the production of the time lags: Comptonization and evolving shots. We perform Monte Carlo simulations of Compton scattering in a homogeneous, isotropic, central corona and show that it qualitatively explain the observed energy and time-delay spectra, but that it cannot explain the differences in the QPO first and second harmonic time-delay spectra, nor the observed dependence of the QPO fractional rms variability upon energy. We consider implications of our results for millisecond pulsar searches in low-mass X-ray binaries.

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