A high sensitivity determination of the hard X-ray spectrum of SCO X-1

Details A high sensitivity determination of the hard X-ray spectrum of SCO X-1 A high sensitivity determination of the hard X-ray spectrum of SCO X-1

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.286..786r&link_type=abstract

Nature, vol. 286, Aug. 21, 1980, p. 786-788.

Astronomy and Astrophysics

Astronomy

11

Heao 1, Oso-7, Scorpius Constellation, Stellar Spectra, X Ray Astronomy, X Ray Spectra, Bremsstrahlung, High Temperature Plasmas, Plasma Temperature, Spectral Energy Distribution, Spectrum Analysis

Scientific paper

The results of hard X-ray observations of Sco X-1 by HEAO 1 and OSO 7 are reported. The X-ray spectrum between 20 and 70 keV was found consistent with thermal bremsstrahlung from a hot plasma at a temperature of 5.15 plus or minus 0.05 keV. Observations with the instruments of HEAO 1 on Sept. 6-7, 1978, and with those of OSO 7 during 1972, have not confirmed reports that the bremsstrahlung spectrum is accompanied by an extra component at energies greater than 40 keV - the reported observations yield a two-standard deviation upper limit to the flux in this region of 6.4 x 10 to the -6th photons/sq cm/s/keV.

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