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The infrared radio correlation has been reexamined for a sample of 237 optically bright spiral galaxies which range from 10^8^ to 10^11^ L_sun_ in far-infrared luminosity. The slope of the correlation is not unity. A simple model in which dust heating by both star formation and the interstellar radiation field contribute to the far-infrared luminosity can account for the nonunity slope. Our model differs from previous two component models, however, in that the relative contribution of the two components is independent of far-infrared color temperature, but is dependent on the far-infrared luminosity.
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Devereux et al. (1989) studied this question.
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