Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362..135h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 10, 1990, p. 135-146.
Astronomy and Astrophysics
Astrophysics
49
Galactic Nuclei, Galactic Radiation, Gamma Ray Spectra, Nuclear Fusion, Positron Annihilation, Continuous Radiation, Energy Spectra, Milky Way Galaxy, Solar Maximum Mission
Scientific paper
The low-energy gamma-ray spectrum from the direction of the Galactic center is determined using data obtained with the SMM Gamma-Ray Spectrometer. It is found that the diffuse gamma-ray spectrum from the Galactic center region can be interpreted in a straightforward way as the sum of five components of a presented equation. The components include a hard power law dominating the continuum at high energies caused principally by cosmic ray electron bremsstrahlung radiation, two narrow lines due to Al-26 decay and positron annihilation, an excess continuum component below 0.511 MeV consistent with the annihilation of positrons by formation of Ps, and a soft power law at low energies which is consistent with an extrapolation upward in energy of known hard X-ray sources in the Galactic center region.
Harris Mark J.
Kinzer Robert L.
Leising Mark D.
Messina Daniel C.
Share Gerald H.
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