The combination of both contributions from the observed UV emission and the absorbed radiations reprocessed in the infrared represents the ideal approach to constrain the activity of massive star formation in galaxies. Using recent results from GALEX and Spitzer, we compare the evolutions of the UV and IR energy densities with redshift as well as their contributions to the star formation history at 0 < ∼ z < ∼ 1. We find that the comoving IR luminosity is characterized by a much faster evolution than seen in the UV. Our results also indicate that ∼ 70 % of the star-forming activity at z ∼ 1 is produced by the so-called IR-luminous sources (LIR ≥ 10 11 L⊙). 1 Dust extinction and the limitations of the UV window The multi-wavelength deep surveys performed in the last decade as well as the detection of the Cosmic Infrared (IR) Background by COBE revealed the dramatic effects of dust extinction in the distant Universe. This significant high-redshift reprocessing of short-wavelength radiations (e.g., UV, optical) into the thermal infrared appears to be associated very closely to the stron
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