Galaxies in the first billion years: Implications for re-ionization and the star formation history at z>6

Andrew J. Bunker, Elizabeth R. Stanway, Laurence P. Eyles, Richard S. Ellis, Richard G. McMahon, Mark Lacy, Daniel P. Stark

Research output: Contribution to journalArticle


We discuss the selection of star-forming galaxies at z6 through the Lyman-break technique. Spitzer imaging implies many of these contain older stellar populations (>200Myr) which produce detectable Balmer breaks. The ages and stellar masses (1010M) imply that the star formation rate density at earlier epochs may have been significantly higher than at z6, and might have played a key role in re-ionizing the universe.

Original languageEnglish (US)
Number of pages1
JournalProceedings of the International Astronomical Union
Issue number14
StatePublished - Aug 1 2006
Externally publishedYes



  • Evolution
  • Formation
  • Galaxies: high-redshift
  • Stellar content

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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