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

  • Andrew J. Bunker (a1), Elizabeth R. Stanway (a2), Laurence P. Eyles (a1), Richard S. Ellis (a3), Richard G. McMahon (a4), Mark Lacy (a5) and Daniel P. Stark (a3)...

Abstract

We discuss the selection of star-forming galaxies at z≃6 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 z≃6, and might have played a key role in re-ionizing the universe.

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References

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Bunker, A. J., Stanway, E. R., Ellis, R. S., et al. 2003, MNRAS (Letters), 342, L47
Bunker, A. J., Stanway, E. R., Ellis, R. S., & McMahon, R. G. 2004, MNRAS, 355, 374
Eyles, L. P, Bunker, A. J., Stanway, E. R., et al. 2005, MNRAS, 364, 443
Eyles, L. P, Bunker, A. J., Ellis, R. S., et al. 2006, MNRAS, 374, 910
Stanway, E. R., Bunker, A. J., & McMahon, R. G. 2003, MNRAS, 342, 439
Stark, D. P., Bunker, A. J., Ellis, R. S., Eyles, L. P., & Lacy, M. 2007, ApJ, 659, 84
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