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Date and Time of the Query: 2019-06-26 T09:55:01 PDT
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For refcode 2015ApJ...810...71F:
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2015ApJ...810...71F The Evolution of the Galaxy Rest-frame Ultraviolet Luminosity Function over the First Two Billion Years Finkelstein, Steven L.; Ryan, Russell E., Jr.; Papovich, Casey; Dickinson, Mark; Song, Mimi; Somerville, Rachel S.; Ferguson, Henry C.; Salmon, Brett; Giavalisco, Mauro; Koekemoer, Anton M.; Ashby, Matthew L. N.; Behroozi, Peter; Castellano, Marco; Dunlop, James S.; Faber, Sandy M.; Fazio, Giovanni G.; Fontana, Adriano; Grogin, Norman A.; Hathi, Nimish; Jaacks, Jason; Kocevski, Dale D.; Livermore, Rachael; McLure, Ross J.; Merlin, Emiliano; Mobasher, Bahram; Newman, Jeffrey A.; Rafelski, Marc; Tilvi, Vithal; Willner, S. P. Abstract. We present a robust measurement and analysis of the rest-frame ultraviolet (UV) luminosity functions at z = 4-8. We use deep Hubble Space Telescope imaging over the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey/GOODS fields, the Hubble Ultra Deep Field, and the Hubble Frontier Field deep parallel observations near the Abell 2744 and MACS J0416.1-2403 clusters. The combination of these surveys provides an effective volume of 0.6-1.2 x 10^6^ Mpc^3^ over this epoch, allowing us to perform a robust search for faint ({M}_{UV_}=-18) and bright (M{}_{UV_}\lt -21) high-redshift galaxies. We select candidate galaxies using a well-tested photometric redshift technique with careful screening of contaminants, finding a sample of 7446 candidate galaxies at 3.5 \lt z \lt 8.5, with >1000 galaxies at z ~ 6-8. We measure both a stepwise luminosity function for candidate galaxies in our redshift samples, and a Schechter function, using a Markov Chain Monte Carlo analysis to measure robust uncertainties. At the faint end, our UV luminosity functions agree with previous studies, yet we find a higher abundance of UV-bright candidate galaxies at z >=slant 6. Our best-fit value of the characteristic magnitude {M}_{UV_}^*^ is consistent with -21 at z >=slant 5, which is different than that inferred based on previous trends at lower redshift, and brighter at ~2sigma significance than previous measures at z = 6 and 7. At z = 8, a single power law provides an equally good fit to the UV luminosity function, while at z = 6 and 7 an exponential cutoff at the bright end is moderately preferred. We compare our luminosity functions to semi-analytical models, and find that the lack of evolution in {M}_{UV_}^*^ is consistent with models where the impact of dust attenuation on the bright end of the luminosity function decreases at higher redshift, although a decreasing impact of feedback may also be possible. We measure the evolution of the cosmic star-formation rate (SFR) density by integrating our observed luminosity functions to {M}_{UV_}=-17, correcting for dust attenuation, and find that the SFR density declines proportionally to (1 +z){}^-4.3+/- 0.5^ at z \gt 4, which is consistent with observations at z >=slant 9. Our observed luminosity functions are consistent with a reionization history that starts at z >~ 10, completes at z \gt 6, and reaches a midpoint (x{}_{{H_} {{II}}} = 0.5) at 6.7 \lt z \lt 9.4. Finally, using a constant cumulative number density selection and an empirically derived rising star-formation history, our observations predict that the abundance of bright z = 9 galaxies is likely higher than previous constraints, although consistent with recent estimates of bright z ~<br/> 10 galaxies. Key words: early universe, galaxies: evolution, galaxies: formation, galaxies: high-redshift, ultraviolet: galaxies
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