Abstract
We have investigated the galactic infrared background (GIRB) light that comes from the integrated emission of individual galaxies at different redshifts. By using (1) the galaxy M 82 infrared (IR) spectrum as a template spectrum of IR active galaxies and (2) the constraint given by the nucleosynthesis of the heavy elements in galaxies, we have derived the IR spectrum of the diffuse light that comes from the galaxies at different redshifts following the method by Stecker, Puget, and Fazio (1977). The observations by Matsumoto et al. (1988) impose severe constraints on the possible scenarios for the birth and evolution of the galaxies. Observations by the COBE satellite are expected to settle some important issues of this problem.
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