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The Dark Age of the Universe

Jordi Miralda-Escudé
Science • 20 Jun 2003 • Vol 300, Issue 5627 • pp. 1904-1909 • DOI: 10.1126/science.1085325
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Abstract

The Dark Age is the period between the time when the cosmic microwave background was emitted and the time when the evolution of structure in the universe led to the gravitational collapse of objects, in which the first stars were formed. The period of reionization started with the ionizing light from the first stars, and it ended when all the atoms in the intergalactic medium had been reionized. The most distant sources of light known at present are galaxies and quasars at redshift z ≅ 6, and their spectra indicate that the end of reionization was occurring just at that time. The Cold Dark Matter theory for structure formation predicts that the first sources formed much earlier.
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I thank X. Fan and N. Gnedin for their permission to reproduce and their help in providing figures from their papers and P. Sieber for suggesting a good way to start this article. I also thank T. Abel, A. Loeb, M. Rees, and my referees for their comments.

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Volume 300 | Issue 5627
20 June 2003

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Jordi Miralda-Escudé
Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA.
Institute for Advanced Study, Princeton, NJ 08540, USA.
Institut d'Estudis Espacials de Catalunya/ICREA, Barcelona, Spain. E-mail: [email protected]
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