A feature in the X-ray spectrum of Cygnus X-1 - A possible positron annihilation line

Details A feature in the X-ray spectrum of Cygnus X-1 - A possible positron annihilation line A feature in the X-ray spectrum of Cygnus X-1 - A possible positron annihilation line

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..389n&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 389-392.

Astronomy and Astrophysics

Astronomy

30

Binary Stars, Compton Effect, Line Spectra, Positron Annihilation, X Ray Spectra, Emission Spectra, Heao 1, Spaceborne Astronomy, Spectrum Analysis

Scientific paper

The authors present a 10 keV to 1 MeV X-ray spectrum of Cyg X-1 in its low state, accumulated over ≡3 months in 1977 and 1978. The spectrum is smooth up to 300 keV. The excess at higher energy may be interpreted as a broad 511 keV emission line from the annihilation of positrons. The width and centroid of the line indicate that the temperature of the line-emitting region is 20-200 keV. The feature could also be caused by Comptonized emission from a 165 keV region.

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