Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-01-13
Astronomy and Astrophysics
Astrophysics
10 pages, including 4 postscript figures, AASTEX. Accepted for publication by ApJ
Scientific paper
10.1086/307346
We have used the Fourier cross spectra of GRO J1719-24, as obtained with BATSE, to estimate the phase lags between the X-ray flux variations in the 20--50 and 50--100 keV energy bands as a function of Fourier frequency in the interval 0.002--0.488 Hz. Our analysis covers the entire ~80 day X-ray outburst of this black-hole candidate, following the first X-ray detection on 1993 September 25. The X-ray variations in the 50--100 keV band lag those in the 20--50 keV energy band by an approximately constant phase difference of 0.072 +/- 0.010 rad in the frequency interval 0.02--0.20 Hz. The peak phase lags in the interval 0.02--0.20 Hz are about twice those of Cyg X-1 and GRO J0422+32.These results are consistent with models for Comptonization regions composed of extended non-uniform clouds around the central source.
Crary David J.
der Hooft Frank van
Finger Mark H.
Harmon Alan B.
Kouveliotou Chryssa
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