LOWER-LUMINOSITY GALAXIES COULD REIONIZE THE UNIVERSE: VERY STEEP FAINT-END SLOPES TO THE UV LUMINOSITY FUNCTIONS AT z ⩾ 5-8 FROM THE HUDF09 WFC3/IR OBSERVATIONS*

@article{Bouwens2012LOWERLUMINOSITYGC,
  title={LOWER-LUMINOSITY GALAXIES COULD REIONIZE THE UNIVERSE: VERY STEEP FAINT-END SLOPES TO THE UV LUMINOSITY FUNCTIONS AT z ⩾ 5-8 FROM THE HUDF09 WFC3/IR OBSERVATIONS*},
  author={Rychard J. Bouwens and Garth D. Illingworth and Pascal A. Oesch and Michele Trenti and Ivo Labb{\'e} and Marijn Franx and Massimo Stiavelli and C. M. Carollo and Pieter van Dokkum and Daniel K. Magee},
  journal={The Astrophysical Journal},
  year={2012},
  volume={752}
}
The HUDF09 data are the deepest near-IR observations ever, reaching to 29.5 mag. Luminosity functions (LFs) from these new HUDF09 data for 132 z ~ 7 and z ~ 8 galaxies are combined with new LFs for z ~ 5-6 galaxies and the earlier z ~ 4 LF to reach to very faint limits ( 8, taking α to be –1.87 ± 0.13 (the mean value at z ~ 6-8), and adopting typical parameters, we derive Thomson optical depths of 0.061+0.009 – 0.006. However, this result will change if the faint-end slope α is not constant… Expand

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