The radial distribution of galactic gamma rays. IV - The whole galaxy

Astronomy and Astrophysics – Astronomy

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Galactic Radiation, Gamma Ray Astronomy, Molecular Clouds, Radial Distribution, Astronomical Spectroscopy, Carbon Monoxide, H I Regions, Interstellar Gas, Radiation Distribution

Scientific paper

The correlation between diffuse galactic γ-rays and gas tracers is studied using the final COS-B database and H I and CO surveys covering the entire galactic plane. A good quantitative fit to the γ-rays is obtained, with a small gradient in the γ-ray emissivity per hydrogen atom. The average ratio of H2 column density to integrated CO temperature is determined. The corresponding mass of molecular hydrogen in the inner Galaxy, derived using both 1st and 4th quadarants, is 1.0×109M_sun;.

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