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STScI Preprint #1341
The number density of the high-redshift (z>2) galaxies discovered over the last few years with the Lyman-break technique is only a factor of a few lower than the number density of galaxies in the Local Universe. Thus, understanding the properties and the nature of these high-redshift systems is instrumental to our understanding of the cosmic evolution of galaxies and their stellar content. I briefly review the observed characteristics of the Lyman-break galaxies, relate these galaxies to their most likely low-redshift counterparts, and discuss the implications of dust obscuration on the global properties of the Lyman-break population. Finally, the observational properties of the high-redshift population are set in the framework of a simple evolutionary model for the stellar, metal and dust content of galaxies, to derive the intrinsic star formation history of the Universe.
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, U.S.A.