PMID: 9419323Jan 14, 1998Paper

The universe at z > 5: when and how did the "dark age" end?

Proceedings of the National Academy of Sciences of the United States of America
M J Rees

Abstract

This paper considers how the first subgalactic structures produced the UV radiation that ionized the intergalactic medium before z = 5 and the "feedback" effects of the UV radiation on structure formation. The first "pregalaxies" may eventually be detectable by their direct UV emission, with characteristic spectral features at Lyman alpha; high-z supernovae may also be detectable. Other probes of the intergalactic medium beyond z = 5, and of the epochs of reheating and reionization, are discussed, along with possible links between the diffusion of pregalactic metals and the origin of magnetic fields.

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