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Date and Time of the Query: 2019-05-22 T11:56:34 PDT
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For refcode 2004ApJ...612L..93Y:
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2004ApJ...612L..93Y Candidates of z =~ 5.5 - 7 Galaxies in the Hubble Space Telescope Ultra Deep Field Haojing Yan and Rogier A. Windhorst Abstract. We report results from our z=~5.5 - 7 galaxy search in the Hubble Space Telescope Ultra Deep Field (UDF). Using the 400 orbit of Advanced Camera for Surveys data, we found 108 plausible 5.5<=z<=6.5 (or z=~6 for short) candidates to m_AB_(z_850_)=30.0 mag. The contamination to the sample, due to either image artifacts or known types of astronomical objects, is likely negligible. The inferred surface densities of z=~6 galaxies are consistent with our earlier predictions from m_AB_(z_850_)=26.5 to 28.5 mag. After correcting for detection incompleteness, the counts of z=~6 candidates to m_AB_(z_850_)=29.2 mag suggest that the faint-end slope of the galaxy luminosity function (LF) at this redshift is likely between {alpha}=-1.8 and -1.9, which is sufficient to account for the entire Lyman photon budget necessary to complete the reionization of the universe at z=~6. We also searched for z=~6.5 - 7 candidates using the UDF Near-Infrared Camera and Multi-Object Spectrometer data and have found four candidates to a magnitude of J_110_=27.2. However, the infrared colors of three candidates cannot be easily explained by galaxies in this redshift range. We tentatively derive an upper limit to the cumulative surface density of galaxies at z=~7 of 0.36 arcmin^-2^ to a magnitude of J_110_=26.6, which suggests a noticeable drop in the LF amplitude from z=~6 to z=~7. Keywords: Cosmology: Observations, Cosmology: Early Universe, Galaxies: Evolution, Galaxies: High-Redshift, Galaxies: Luminosity Function, Mass Function
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