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High-redshift galaxy populations

Nature volume 440, pages 1145–1150 (2006)Cite this article

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, γ-ray bursts. The γ-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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Figure 1: Star formation history versus cosmic time since the Big Bang.
Figure 2: The Hubble Deep Field used for HST studies and for ground-based narrowband Lyα surveys.
Figure 3: Lyman α emission-line profiles of galaxies at z ≈ 5.7 and z ≈ 6.6.
Figure 4: Distribution of z ≈ 5.7 and z ≈ 6.5 in two adjacent Suprime-Cam fields.
Figure 5: Ultraviolet continuum luminosity functions for galaxies from redshifts 3 to 6.

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Acknowledgements

This research was supported by National Science Foundation grants. We thank E. Stanway and A. Barger for their help in constructing Fig. 1.

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    Esther M. Hu & Lennox L. Cowie

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Hu, E., Cowie, L. High-redshift galaxy populations. Nature 440, 1145–1150 (2006). https://doi.org/10.1038/nature04806

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