EGRET observations of gamma-ray emission from the interstellar gas in Orion

Details EGRET observations of gamma-ray emission from the interstellar gas in Orion EGRET observations of gamma-ray emission from the interstellar gas in Orion

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441..270d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 441, no. 1, p. 270-280

Astronomy and Astrophysics

Astronomy

62

Emission Spectra, Gamma Ray Astronomy, Gamma Ray Spectra, Interstellar Gas, Molecular Gases, Orion Nebula, Radio Sources (Astronomy), Gamma Ray Observatory, Gamma Ray Telescopes, Sky Surveys (Astronomy)

Scientific paper

The high-energy diffuse gamma-ray emission from the interstellar gas in Orion was studied using observations from the Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma-Ray Observatory (CGRO) and radio surveys of the H I and CO emission. The good correlation of the gamma-ray emission with the atomic and molecular gas permits determination of the gamma-ray emissivity per nucleon in the interstellar medium and the molecular mass calibrating ratio N(H2)/Wco in Orion. The integral gamma-ray emissivity is (1.7 +/- 0.1) x 10-26/s/sr for E greater than 100 MeV, in good agreement with expectations from studies of the diffuse emission on larger scales. The N(H2)/Wco ratio is (1.06 +/- 0.14) x 1020/sq cm/(K km/s), approximately 40% less than the commonly adopted Galactic average. We find no evidence for variations of the cosmic-ray density or N(H2)/Wco ratio in Orion at the sensitivity and resolution of EGRET.

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