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Nature 440, 1145-1150 (27 April 2006) | doi:10.1038/nature04806; Published online 26 April 2006
Review Article High-redshift galaxy populations
Esther M. Hu1 & Lennox L. Cowie1
Abstract
We now see many galaxies as they were only 800 million years after the Big Bang, and that limit may soon be exceeded when wide-field infrared detectors are widely available. Multi-wavelength studies show that there was relatively little star formation at very early times and that star formation was at its maximum at about half the age of the Universe. A small number of high-redshift objects have been found by targeting X-ray and radio sources and most recently, 
-ray bursts. The -ray burst sources may provide a way to reach even higher-redshift galaxies in the future, and to probe the first generation of stars.
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