Sigma detection of hard X-ray emission from the soft transient type I X-ray burster KS 1731 - 260

Details Sigma detection of hard X-ray emission from the soft transient type I X-ray burster KS 1731 - 260 Sigma detection of hard X-ray emission from the soft transient type I X-ray burster KS 1731 - 260

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...394..615b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 394, no. 2, Aug. 1, 1992, p. 615-618.

Astronomy and Astrophysics

Astrophysics

51

Emission Spectra, Neutron Stars, X Ray Stars, Astronomical Spectroscopy, Compton Effect, X Ray Telescopes

Scientific paper

Observations of KS 1731 - 260 by the French hard X-ray/soft gamma-ray telescope Sigma reveal the existence of a hard state for which the spectrum extends to 150 keV, with a power-law shape characterized by a photon spectral index of about 2.9 (+/-0.8). Consequently, KS 1731 - 260 must be added to the list of the hard X-ray sources located within the 100 sq deg around the Galactic center. The result also supports the idea that power-law tails are not an exclusive property of the ultrasoft transients, which are black hole candidates, but may also be a temporary characteristic of weak magnetized neutron stars.

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