Hard X-ray observation of Cygnus X-3

Details Hard X-ray observation of Cygnus X-3 Hard X-ray observation of Cygnus X-3

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..329r&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Nov. 15, 1979, p. 329-332. Research supported by the Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astronomy

10

Binary Stars, Cygnus Constellation, Stellar Spectrophotometry, X Ray Astronomy, Bremsstrahlung, Gamma Rays, Photon Density, Radiant Flux Density, Spectrum Analysis, X Ray Spectra

Scientific paper

During a balloon observation on October 18, 1977 the high-energy X-ray spectrum (20-90 keV) of Cyg X-3 was measured with high statistical accuracy. It is found to be consistent with a thermal bremsstrahlung spectrum with kT 17.5(+3.1, -2.6) keV or a power law E to the -gamma power of the differential photon flux spectrum with gamma 3.6 + or - 0.3. The extrapolation of the observed spectrum to about 100 MeV yields a gamma-ray intensity which is at least three orders of magnitude below the intensity found by SAS 2 (Lamb et al. 1977). This indicates that the overall spectral behavior of Cyg X-3 is much different from that of the Crab and Vela pulsars.

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