Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...194..271b&link_type=abstract
Astrophysical Journal, vol. 194, Dec. 1, 1974, pt. 1, p. 271-277.
Astronomy and Astrophysics
Astronomy
1
Continuous Radiation, Galactic Radiation, H Lines, Interstellar Matter, Interstellar Radiation, Microwave Emission, Cosmic Rays, Homogeneity, Hydrogen Clouds, Interstellar Magnetic Fields, Nonthermal Radiation, Radio Astronomy, Synchrotron Radiation
Scientific paper
Observations of nonthermal continuum radio emission at 750 MHz and hydrogen-line emission at 1420 MHz have been compared in order to test the extent to which cosmic-ray electrons, magnetic fields, and hydrogen gas coexist in the interstellar medium. If the interstellar medium is homogeneous in the sense that its constituents are mixed together and can interact, then regions of line and continuum emission should be spatially correlated. The measurements indicate that at most 28% of continuum emission in the Galaxy comes from such a homogeneous medium. The remaining nonthermal emission agrees in magnitude with the residual emission found by Berkhuijsen after subtraction of the polarized component of nonthermal emission. In addition, the data discussed here show that the major filamentary structures found in the two forms of emission rarely coincide spatially. Consequently, both the average and the exceptional structure in the medium indicate that the synchrotron-radiating magnetoplasma and the neutral hydrogen gas are not closely interacting in the present state of the medium.
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