Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207...62p&link_type=abstract
Astrophysical Journal, vol. 207, July 1, 1976, pt. 1, p. 62-77.
Astronomy and Astrophysics
Astrophysics
72
Cosmic Rays, Galactic Structure, Interstellar Gas, Interstellar Magnetic Fields, Milky Way Galaxy, Spatial Distribution, Andromeda Galaxy, Cosmic X Rays, Gamma Rays, Gas Density, Magnetic Field Configurations, Nonthermal Radiation, Radiant Flux Density, Radio Galaxies, Radio Observation
Scientific paper
A tentative picture of the large-scale distribution of gas, magnetic fields, and cosmic rays in the galactic disk, derived from high-energy gamma-ray and nonthermal radio surveys supplemented by radio observations on M31, is presented. The interpretation of the observational material suggests that, on a large scale, the cosmic-ray density and the square of the magnetic field strength are both proportional to the gas density. The distribution of the gas along a spiral pattern is derived from the radio and gamma-ray data; the results are consistent with an important amount of molecular hydrogen in the inner Galaxy. Given the local cosmic-ray intensity, the model yields local values for the magnetic field strength, the gas density, and the velocity dispersion which are in agreement with independent evaluations. Assuming that cosmic-ray injection is related to the gas density, further implications regarding cosmic-ray creation and propagation are discussed.
Cass'e Michel
Cesarsky Catherine J.
Paul Jacques
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