Space Science Reviews

, Volume 84, Issue 1–2, pp 43–53 | Cite as

Stars and Stellar Systems at z > 5: Implications for Structure Formation and Nucleosynthesis

  • Martin J. Rees


Enough UV radiation was generated before z = 5 to have ionized the intergalactic medium. If this comes from stars (probably aggregated in systems of subgalactic scale), one straightforwardly calculates that the associated nucleosynthesis would be sufficient to produce a universal abundance of order 1 percent of solar. The first ‘pre-galaxies’ 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 IGM 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.


Radiation Magnetic Field Spectral Feature Structure Formation Stellar System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Martin J. Rees
    • 1
  1. 1.Institute of AstronomyCambridgeUK

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