The high energy X-ray spectrum of 4U1700-37 observed from OSO-8

Details The high energy X-ray spectrum of 4U1700-37 observed from OSO-8 The high energy X-ray spectrum of 4U1700-37 observed from OSO-8

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979stin...8017975d&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Oso-8, Scorpius Constellation, X Ray Sources, X Ray Spectra, Black Holes (Astronomy), Neutron Stars, Orbital Velocity, Periodic Variations, Stellar Evolution

Scientific paper

The most intense hard X-ray source in the confused region in Scorpius is identified as 4U1700-37. The 3.4-day modulation is seen above 20 keV with the intensity during eclipse being consistent with zero flux. The photon-number spectrum from 20 to 150 keV is well represented by a single power law with a photo-number spectral index of -2.77 + or - 0.35 or by a thermal bremsstrahlung spectrum with kT = 27 96.8-min X-ray modulation previously reported at lower energies. Despite the difficulties in reconciling both the lack of periodic modulation in the emitted X-radiation and the orbital dynamics of the system with theories of the evolution and physical properties of neutron stars, the observed properties of 4U1700-37 are all consistent with the source being a spherically accreting neutron star rather than a black hole.

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