Hard X-ray spectrum of Cygnus X-1

Details Hard X-ray spectrum of Cygnus X-1 Hard X-ray spectrum of Cygnus X-1

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.293..275n&link_type=abstract

Nature, vol. 293, Sept. 24, 1981, p. 275-277.

Astronomy and Astrophysics

Astronomy

43

Binary Stars, Black Holes (Astronomy), Heao 1, Stellar Spectra, X Ray Sources, X Ray Spectra, Cygnus Constellation, Electron Energy, Spaceborne Astronomy, Spectrum Analysis

Scientific paper

Long-term measurements of the hard X-ray spectrum from 3 keV to 8 MeV of the black-hole candidate Cygnus X-1 in its low state are reported. Observations were made from October 26 to November 18, 1977 with the A2 (Cosmic X-ray) and A4 (Hard X-ray and Low-Energy Gamma-Ray) experiments on board HEAO 1 in the spacecraft's scanning mode. The measured spectrum below 200 keV is found to agree well with previous spectra which have been fit by a model of the Compton scattering of optical or UV photons in a very hot plasma of electron temperature 32.4 keV and optical depth 3.9 or 1.6 for spherical or disk geometry, respectively. At energies above 300 keV, however, flux excess is observed which may be accounted for by a distribution of electron temperatures from 15 to about 100 keV.

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