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    A feature in the X-ray spectrum of Cygnus X-1 - A possible positron annihilation line (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The paper presents 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.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 265
    Format: text
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