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Thermal infrared and nonthermal radio - Remarkable correlation in disks of galaxies
Helou, G.; Soifer, B. T.; Rowan-Robinson, M.
AA(California Institute of Technology, Pasadena), AB(California Institute of Technology, Pasadena), AC(Queen Mary College, London, England)
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 298, Nov. 1, 1985, p. L7-L11. NASA-supported research. (ApJL Homepage)
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NASA/STI Keywords:
Far Infrared Radiation, Nonthermal Radiation, Radio Sources (Astronomy), Spiral Galaxies, Stellar Evolution, Disks, Radio Emission, Virgo Galactic Cluster
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A tight, linear correlation is established between the far-infrared flux measured by IRAS and the nonthermal radio flux density (at 1.4 GHz) from disks of spiral galaxies. This correlation defines a ratio of infrared to radio fluxes that is characteristic of star formation activity. Galaxies with nuclear starbursts seem to follow the correlation. If the far-infrared is reradiated luminosity from young massive stars, then the supernova remnants alone account for less than 10 percent of the radio emission. These results indicate a close coupling between dust heating and cosmic-ray generation and confinement in a wide range of conditions.

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