Gamma ray lines from the Galactic Center and gamma ray transients

Details Gamma ray lines from the Galactic Center and gamma ray transients Gamma ray lines from the Galactic Center and gamma ray transients

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8125033r&link_type=abstract

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Galactic Radiation, Gamma Ray Bursts, Gamma Rays, Milky Way Galaxy, Cyclotron Radiation, Electron-Positron Pairs, Galactic Nuclei, Heao 3, Line Spectra, Magnetic Fields, Neutron Stars, Positron Annihilation

Scientific paper

The observations and interpretations of cosmic (nonsolar) gamma ray lines are discussed. The most prominent of these lines is the e(+)e(-) annihilation line which was observed from the Galactic Center and from several gamma ray transients. At the Galactic Center the e(+)e(-) pairs are probably produced by an accreting massive black hole (solar mass of approximately one million) and annihilate within the central light year to produce a line at almost exactly 0.511 MeV. In gamma ray transients the annihilation line is redshifted by factors consistent with neutron star surface redshifts. Other observed transient gamma ray lines appear to be due to cyclotron absorption in the strong magnetic fields of neutron stars, and nuclear deexcitations and neutron capture, which could also occur on or around these objects.

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