COMPTEL observations of the Orion complex: Evidence for cosmic-ray induced gamma-ray lines

Details COMPTEL observations of the Orion complex: Evidence for cosmic-ray induced gamma-ray lines COMPTEL observations of the Orion complex: Evidence for cosmic-ray induced gamma-ray lines

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281l...5b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 1, p. L5-L8

Astronomy and Astrophysics

Astrophysics

135

Cosmic Rays, Gamma Rays, Line Spectra, Molecular Clouds, Orion Constellation, Energy Spectra, Gamma Ray Observatory, Maximum Entropy Method, Maximum Likelihood Estimates

Scientific paper

We report the detection of gamma-ray emission from the Orion complex in the 3-7 MeV range by the Imaging Compton Telescope (COMPTEL) telescope aboard the Compton Gamma Ray Observatory (CGRO). This emission can be identified with the 4.44 MeV and 6.13 MeV nuclear de-excitation lines of C-12star and O-16star, respectively, which are predicted to be the strongest gamma-ray lines originating from the interaction of energetic particles with ambient matter. However, the observed flux of (1.0 +/- 0.15) x 10 -4 photon/sq cm/s (3-7 MeV) is much larger than anticipated. There is good circumstantial evidence that our findings indicate strongly enhanced abundances of C and O in low-energy cosmic rays (approximately 10 MeV/nucleon), rather than high fluxes of cosmic-ray protons and alpha-particles. The positrons resulting from energetic particle interactions in the Orion region should produce 511 keV annihilation radiation that is detectable by Oriented Scintillation Spectrometer Experiment (OSSE).

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