view Abstract Citations (76) References (39) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS EGRET Observations of Gamma-Ray Emission from the Interstellar Gas in Orion Digel, S. W. ; Hunter, S. D. ; Mukherjee, R. Abstract 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. Publication: The Astrophysical Journal Pub Date: March 1995 DOI: 10.1086/175354 Bibcode: 1995ApJ...441..270D Keywords: 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); Astronomy; GAMMA RAYS: OBSERVATIONS; ISM: CLOUDS; ISM: MOLECULES; RADIO LINES: ISM full text sources ADS | data products SIMBAD (7) HEASARC (1)
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Digel et al. (1995) studied this question.