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- W2073390653 abstract "From a short EXOSAT observation of the bright low mass X-ray binary GX 5-1 we have derived information about the spectral and the QPO behaviour of this source during a very high intensity state. GX 5-1 was found to be on the ‘horizontal branch’ in the hardness ratio/intensity diagram. The X-ray luminosity (1–20 keV) varied from 3.8 ∗ 10 38 to 4.5 ∗ 10 38 erg/s (for 10 kpc) on a time scale of hour. The spectral analysis showed that at all intensities two spectral components are required to fit the data. One component always is a black body spectrum with a temperature around kT=1.1 keV. Intensity variation are mainly due to this constant temperature BB component. For a distance of 10 kpc we derive a BB radius of 35 km. For the second spectral component we cannot single out a particular model because the data are fitted equally well different spectral functions. We found the QPO phenomenon to be present at a weak level, with a rms value of 2.4% for the QPO peak and 2.8% for low frequency noise. The centroid frequency of the QPO peak was found at 41.5 Hz. These values are in good agreement with QPO parameters extrapolated from lower intensity levels." @default.
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- W2073390653 date "1988-01-01" @default.
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- W2073390653 title "Spectral and QPO analysis of GX5-1 at very high intensity" @default.
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- W2073390653 doi "https://doi.org/10.1016/0273-1177(88)90438-3" @default.
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