Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-06-03
Astronomy and Astrophysics
Astrophysics
11 Pages, 4 figures (one color figure). Accepted for publication in the Astrophysical Journal Letters
Scientific paper
10.1086/311564
We discovered two simultaneous kHz quasi-periodic oscillations (QPOs) in the bright low-mass X-ray binary and Z source GX 5-1 with the Rossi X-ray Timing Explorer. In the X-ray color-color and hardness-intensity diagram a clear Z track is traced out, which shifted between observations. The frequencies of the two kHz QPOs increased from ~215 Hz and ~500 Hz on the left part of the horizontal branch to ~700 Hz and ~890 Hz, respectively, on the upper part of the normal branch. With increasing frequency the FWHM and rms amplitude (8.6-60 keV) of the higher-frequency kHz QPO decreased from 300 to 30 Hz, and from 6.6 to 2.4%, respectively. The FWHM and amplitude of the lower-frequency kHz QPO (50-100 Hz and 3-4% rms) did not correlate with the position of the source on the Z track. The kHz QPO separation was consistent with being constant at 298+/-11 Hz. Simultaneously with the kHz QPOs horizontal branch oscillations (HBOs) were detected with frequencies between 18 and 56 Hz.
Kuulkers Erik
Lamb Frederick K.
Méndez Mariano
Psaltis Dimitrios
van der Klis Michiel
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