Abstract
We briefly review recent discoveries on high-redshift star-formation obtained with observations at long-wavelengths by ground-based mm telescopes and space IR observatories. These observations indicate extremely high rates of cosmic evolution for IR galaxies and dramatic starburst activity at moderate to high redshifts. Our interpretative scheme considers a bimodal star formation (SF) in galaxies, including long-lived quiescent SF, and enhanced SF taking place during transient luminous events triggered by interactions and merging. An increase with z of the rate of interactions between galaxies (density evolution) and an increase of their IR luminosity due to the more abundant fuel available in the past (luminosity evolution) explain the strong observed evolution. Many of the phenomena revealed by these long-wavelength observations (e.g. the rate of cosmic evolution and luminosities of IR galaxies, and the IR background energetics) were largely unexpected based on UV-optical observations. history
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