Relevance of cosmic gamma rays to the mass of gas in the galaxy

Details Relevance of cosmic gamma rays to the mass of gas in the galaxy Relevance of cosmic gamma rays to the mass of gas in the galaxy

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1..336b&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 336-337 (SEE N85-33902 22-93)

Physics

1

Cosmic Gases, Cosmic Rays, Diffuse Radiation, Galactic Radiation, Gamma Rays, Interstellar Matter, Radiant Flux Density, Stellar Mass, Carbon Monoxide, Hydrogen, Molecular Clouds, Molecular Gases, Particle Interactions, Spatial Distribution

Scientific paper

The bulk of the diffuse gamma-ray flux comes from cosmic ray interactions in the interstellar medium. A knowledge of the large scale spatial distribution of the Galactic gamma-rays and the cosmic rays enables the distribution of the target gas to be examined. An approach of this type is used here to estimate the total mass of the molecular gas in the galaxy. It is shown to be much less than that previously derived, viz., approximately 6 x 10 to the 8th power solar masses within the solar radius as against approximately 3 x 10 to the 9th power based on 2.6 mm CO measurements.

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