SIGMA observations of hard X-ray and soft gamma-ray emission from X-ray binaries.

Details SIGMA observations of hard X-ray and soft gamma-ray emission from X-ray binaries. SIGMA observations of hard X-ray and soft gamma-ray emission from X-ray binaries.

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13r.139l&link_type=abstract

Advances in Space Research, Vol. 13, No. 12, p. 139 - 148

Physics

Scientific paper

After more than two years of operation, the imaging γ-ray SIGMA telescope has accumulated several days of observation toward well known X-ray binaries. Four bright sources falling in this category have been detected so far: the pulsar GX 1+4 near the center of the Galaxy, the stellar wind accreting system 4U 1700-377, and the black hole candidates Cygnus X-1 and GX 339-4. Moreover, SIGMA has observed three transients sources, which turned out to be also hard X-ray sources: the burster KS 1731-260, TrA X-1, and the Musca Nova. The properties of these systems in the SIGMA domain will be reviewed and a spectral distinction between black holes and neutron stars will be sketched.

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