Positron annihilation radiation from X-ray binary systems

Details Positron annihilation radiation from X-ray binary systems Positron annihilation radiation from X-ray binary systems

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404..276w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 1, p. 276-280.

Astronomy and Astrophysics

Astrophysics

Positron Annihilation, Stellar Radiation, X Ray Binaries, Galactic Nuclei, Gamma Ray Spectra, Milky Way Galaxy, Stellar Models

Scientific paper

Results are presented of a detailed investigation of the electron-positron annihilation process around X-ray binary systems, typically the Cygnus X-3 system, by a Monte Carlo calculation. It is shown that there exists a narrow 511 keV annihilation line emitted from some kind of X-ray binary system, e.g., from an accreting neutron X-ray source which contains an optically thick accretion disk corona. The significance and width of radiation lines depend on the corona electron density and the size, status, and temperature distribution of the X-ray halo around the binary system.

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