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The High Energy X-ray Spectrum of 4U1700-37 Observed from OSO-8The 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.
Document ID
19800009713
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Dolan, J. F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Coe, M. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Crannell, C. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dennis, B. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Frost, K. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Maurer, G. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Orwig, L. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 4, 2013
Publication Date
October 1, 1979
Subject Category
Space Radiation
Report/Patent Number
NASA-TM-80583
Report Number: NASA-TM-80583
Accession Number
80N17975
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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