Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59..359v&link_type=abstract
Astronomy and Astrophysics, vol. 59, no. 3, Aug. 1977, p. 359-366.
Astronomy and Astrophysics
Astrophysics
29
Cosmic Rays, Galactic Radio Waves, Spiral Galaxies, Thermal Emission, Continuous Spectra, Disks (Shapes), H Ii Regions, Hydrogen Ions, Nonthermal Radiation, Optical Measurement, Radial Distribution
Scientific paper
Radio continuum observations of the spiral galaxy M51 at frequencies of 610, 1415, and 4995 MHz are examined. It is shown that both the intensity and the distribution of thermal radio emission in M51 can be predicted rather accurately from available optical measurements. The observed variation of the spectral index between 1415 and 4995 MHz across the spiral arms is explained by demonstrating that thermal emission from H II regions constitutes a significant fraction of the arm emission at the higher frequency. The radial distribution of the observed nonthermal radio surface brightness is found to resemble closely that of the total optical brightness. A model involving a cosmic-ray origin of the nonthermal radio emission is evaluated in which the cosmic-ray sources are related to some component of the total disk population.
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