Cosmic gamma rays and the mass of gas in the Galaxy

Details Cosmic gamma rays and the mass of gas in the Galaxy Cosmic gamma rays and the mass of gas in the Galaxy

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.314..511b&link_type=abstract

Nature (ISSN 0028-0836), vol. 314, April 11, 1985, p. 511-515.

Astronomy and Astrophysics

Astronomy

76

Galactic Cosmic Rays, Galactic Nuclei, Gamma Ray Astronomy, Gas Density, Molecular Clouds, Carbon Monoxide, Galactic Structure, Hydrogen Clouds, Interstellar Chemistry, Mass Distribution, Molecular Excitation, Orion Nebula, Radial Distribution, Virial Theorem

Scientific paper

The authors make the case that the cosmic-ray particles that produce cosmic γ-rays in the 100-MeV region can penetrate most of the dense clouds of gas that seem to contain much of the mass of gas in the Galaxy. The authors determine a probable form for cosmic-ray intensity as a function of galactic position and use the measured γ-ray intensities to derive the surface density of gas as a function of position. Their estimate of ≡6×108M_sun; for the total mass of molecular hydrogen compared with 1×109M_sun; for atomic hydrogen in the inner Galaxy is a significant change in the contemporary perspective.

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