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EXOSAT observations of the bright X-ray source GX9+1

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Abstract

We present the results of the spectral and timing analysis of an observation of GX9+1/4U1758-205 performed with the Medium Energy Experiment aboard EXOSAT. During our observation the source flux varied irregularly in time scales from minutes to hours. No periodic emission in the period range from 16 msec to 2000 sec was found with an upper limit of around 1% (3 σ) for the pulsed fraction. The hardness ratio shows a correlated change with the flux intensity (Sco X-1 behaviour). The spectrum could be fitted by a double component model, a black body component (kT=1.16–1.26 keV) together with a thermal bremsstrahlung law (kT=13–15keV). The black-body temperature-black-body flux relation follows a Stefan Boltzmann law with RBB=15.3 km*D/10 kpc. No iron line was detected. The upper limit for the line equivalent width of a 6.7 keV iron emission line is 40 eV (1σ). The X-ray spectral behaviour of GX9+1 indicates, that this source belongs to the class of Low-Mass X-ray Binaries (LMXB).

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  1. Max-Planck-Institut für extraterrestrische Physik, D-8046, Garching, F.R.G.

    A. Langmeier, M. Sztajno, J. Trümper & G. Hasinger

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  1. A. Langmeier
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  2. M. Sztajno
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  3. J. Trümper
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  4. G. Hasinger
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Langmeier, A., Sztajno, M., Trümper, J. et al. EXOSAT observations of the bright X-ray source GX9+1. Space Sci Rev 40, 367–370 (1985). https://doi.org/10.1007/BF00179842

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