The sources of the Cosmic Infrared Background
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The discovery of the Cosmic Infrared Background (CIB) in 1996, together with recent cosmological surveys from the mid-infrared to the millimeter have revolutionized our view of star formation at high redshifts. It has become clear, in the last decade, that a population of galaxies that radiate most of their power in the far-infrared (the so-called ``infrared galaxies'') contributes an important part of the whole galaxy build-up in the Universe. Since 1996, detailed (and often painful) investigations of the high-redshift infrared galaxies have resulted in the spectacular progress reviewed in this paper. Among others, we emphasize a new Spitzer result based on a Far-IR stacking analysis of mid-IR sources.
To appear in The Fabulous Destiny of Galaxies: Bridging Past and Present, conference held in Marseille, June 2005
To appear in The Fabulous Destiny of Galaxies: Bridging Past and Present, conference held in Marseille, June 2005