The hard X-ray spectrum of Cygnus X-1

Details The hard X-ray spectrum of Cygnus X-1 The hard X-ray spectrum of Cygnus X-1

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107..350s&link_type=abstract

Astronomy and Astrophysics, vol. 107, no. 2, Mar. 1982, p. 350-353.

Astronomy and Astrophysics

Astronomy

21

Binary Stars, Black Holes (Astronomy), Stellar Spectra, X Ray Sources, Balloon-Borne Instruments, Compton Effect, Cygnus Constellation, Electron Energy, Photons, Scintillation Counters, Thomson Scattering, X Ray Spectra

Scientific paper

The hard X-ray source and black-hole candidate Cygnus X-1 was observed in the high-energy X-ray range (15-160 keV) by balloon-borne scintillation detectors in 1975, 1976, and 1977. During all three observations, the source was in the 'low-state' in the low energy range (Kaluzienski, 1979). The spectra coincide within the error limits above 30 keV. The existence of a spectral break near 80 keV is firmly established. The data are well fitted by a spectrum expected from Comptonization of soft photons in a hot cloud having an electron temperature of about 30 keV and a Thompson scattering optical length of about 5.

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