The discovery of a hard X-ray component in the horizontal branch spectrum of the Z source GX 17+2

Details The discovery of a hard X-ray component in the horizontal branch spectrum of the Z source GX 17+2 The discovery of a hard X-ray component in the horizontal branch spectrum of the Z source GX 17+2

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.459..341d&link_type=abstract

In: Exploring the gamma-ray universe. Proceedings of the Fourth INTEGRAL Workshop, 4-8 September 2000, Alicante, Spain. Editor:

Computer Science

X-Ray Spectrum, Neutron Stars

Scientific paper

We report on a long BeppoSAX (0.1 - 200 keV energy range) observation of the Z-source GX 17+2. The source was on Horizontal and Normal branches of the hardness-intensity diagram. Energy spectra were selected based on the source position in this diagram. The spectral continuum is well described by the sum of a ~0.6 keV blackbody and a Comptonized component, resulting from upscattering of ~1 keV seed photons by electrons at a temperature of ~3 keV and optical depth of ~10. Iron K-line and edge were also present at energies ~6.7 and ~8.5 keV, respectively, corresponding to high ionization stages (Fe XXIII-XXV). In the spectra of the Horizontal branch a hard tail was clearly detected at energies above ~30 keV. It can be fit to a power law of photon index ~2.7, contributing ~8% of the source flux. This component gradually disappears as the source moved towards the Normal branch. We discuss the similarities with spectra of accreting black holes and implications on spectral models.

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