Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976stin...7711965k&link_type=abstract
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Astronomy and Astrophysics
Astrophysics
Astrophysics, Cosmic Rays, Galactic Clusters, Gamma Rays, Astronomical Models, Carbon Monoxide, Galactic Radiation, Hydrogen, Interstellar Gas, Interstellar Magnetic Fields
Scientific paper
Theoretical considerations and analysis of the results of gamma ray astronomy suggest that the galactic cosmic rays are dynamically coupled to the interstellar matter through the magnetic fields, and hence the cosmic ray density should be enhanced where the matter density is greatest on the scale of galactic arms. This concept has been explored in a galactic model using recent 21 cm radio observations of the neutral hydrogen and 2.6 mm observations of carbon monoxide, which is considered to be a tracer of molecular hydrogen. The model assumes: (1) cosmic rays are galactic and not universal; (2) on the scale of galactic arms, the cosmic ray column (surface) density is proportional to the total interstellar gas column density; (3) the cosmic ray scale height is significantly larger than the scale height of the matter; and (4) ours is a spiral galaxy characterized by an arm to interarm density ratio of about 3:1.
Fichtel Carl E.
Kniffen Donald A.
Thompson Daniel J.
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