Search for a narrow annihilation feature correlated with the MeV emission of Cygnus X-1

Details Search for a narrow annihilation feature correlated with the MeV emission of Cygnus X-1 Search for a narrow annihilation feature correlated with the MeV emission of Cygnus X-1

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343l..57l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 343, Aug. 15, 1989, p. L57-L59.

Astronomy and Astrophysics

Astronomy

37

Accretion Disks, Annihilation Reactions, Black Holes (Astronomy), Emission Spectra, Spectrum Analysis, X Ray Sources, Cygnus Constellation, Gamma Ray Astronomy, Heao 3, Pair Production

Scientific paper

Strong gamma-ray emission near 1 MeV from Cygnus X-1 observed in the fall of 1979 during the 'gamma 1' period has been interpreted by Liang and Dermer (1988) as thermal emission from a relativistic, pair-dominated region surrounding the black hole. The observed gamma-rays should interact with each other and with X-rays to form electron/positron pairs inside and outside the accretion disk. Because the Eddington limit is reduced by a factor of 1836 in the presence of positrons, some pairs formed inside the disk may also escape the system under the influence of radiation pressure. If these pairs stop in the cold surrounding medium, a narrow 511 keV annihilation feature should be produced. The high resolution gamma 1 spectrum has been examined for such a feature, and some evidence at 1.9 sigma statistical significance for the line is observed with a flux which is generally consistent with theoretical expectations.

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