Spectral analysis of the 1975 May transition of Cygnus X-1

Details Spectral analysis of the 1975 May transition of Cygnus X-1 Spectral analysis of the 1975 May transition of Cygnus X-1

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..139c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 197, Oct. 1981, p. 139-150. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

14

Ariel 5 Satellite, Black Body Radiation, Electron Energy, Spectrum Analysis, X Ray Sources, X Ray Spectra, Astronomical Models, Cygnus Constellation, Light Curve, Optical Thickness, Photons

Scientific paper

X-ray spectra from Ariel V of the 1975 May active (HI) state and the subsequent transition of Cyg X-1 are examined. The presence of a blackbody soft component (kT approximately equal to 0.3 keV) in the spectrum is revealed. During the transition the spectral index of the hard, power-law component decreases from 2.8 to 2.0. The possibility of a simultaneous variation of the blackbody temperature is discussed. A weak emission feature may be present at 6-7 keV. The data are found to be in general agreement with the predictions of inverse Compton models for Cyg X-1. An estimate of the electron temperature and the optical thickness for Thomson scattering of the emitting region is attempted on the basis of recent theoretical calculations.

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