Cosmic ray exclusion from dense molecular clouds

Details Cosmic ray exclusion from dense molecular clouds Cosmic ray exclusion from dense molecular clouds

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....53..253s&link_type=abstract

Astronomy and Astrophysics, vol. 53, no. 2, Dec. 1976, p. 253-258.

Astronomy and Astrophysics

Astrophysics

62

Cosmic Rays, Gamma Rays, Gas Density, Hydrogen Clouds, Magnetohydrodynamic Waves, Particle Flux Density, Cosmic X Rays, Galactic Nuclei, Ionizing Radiation, Milky Way Galaxy

Scientific paper

A mechanism is sought by which cosmic rays could be inhibited from entering dense molecular hydrogen clouds in the Galaxy as a whole and at the galactic center. Analysis indicates that Alfven waves generated outside dense clouds by the net flux of cosmic rays into the clouds are most effective at excluding cosmic rays below a few hundred MeV in energy, that the MeV cosmic rays which are most effective in ionizing cloud material are excluded very efficiently, and that the intensity of particles with energy of about 1 MeV is reduced by a factor of approximately 25. The reduction in gamma-ray flux (via neutral-pion decay) caused by the Alfven waves is computed for two different values of ambient cosmic-ray intensity and cloud depth. The results are applied to clouds in the Galaxy and in the galactic-center region.

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