Abstract
Existing spectral evolutionary models of galaxies are supplemented in a semiempirical way in order to study the contribution of normal galaxies to the diffuse infrared background radiation. The predicted intensity of the infrared background produced by normal galaxies in the wavelength range from 1 to 250 μm is between one and two orders of magnitudes below the preliminary South Ecliptic Pole observations reported by the Diffuse Infrared Background Experiment (DIRBE) carried out on board the Cosmic Background Explorer (COBE) satellite. A difference in this sense is expected since the DIRBE results include foreground contamination from interplanetary and galactic sources. However, more refined galaxy models are needed in order to derive the normal galaxy contribution to the infrared background more precisely.
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