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. Marcella Carollo and Pieter G. van Dokkum and Daniel K. Magee},
  journal={The Astrophysical Journal Letters},
  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 (<0.05  L*z = 3). The faint-end slopes α are steep: −1.79 ± 0.12 (z ∼ 5), −1.73 ± 0.20 (z ∼ 6), −2.01 ± 0.21 (z ∼ 7), and −1.91 ± 0.32 (z ∼ 8). Slopes α ≲ −2 lead to formally divergent UV fluxes, though galaxies are not expected… 

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