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Title:
Discovery of z ~ 8 Galaxies in the Hubble Ultra Deep Field from Ultra-Deep WFC3/IR Observations
Authors:
Bouwens, R. J.; Illingworth, G. D.; Oesch, P. A.; Stiavelli, M.; van Dokkum, P.; Trenti, M.; Magee, D.; Labbé, I.; Franx, M.; Carollo, C. M.; Gonzalez, V.
Affiliation:
AA(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064, USA ; Leiden Observatory, Leiden University, NL-2300 RA Leiden, The Netherlands ), AB(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064, USA ), AC(Institute for Astronomy, ETH Zurich, 8092 Zurich, Switzerland ), AD(Space Telescope Science Institute, Baltimore, MD 21218, USA ), AE(Department of Astronomy, Yale University, New Haven, CT 06520, USA ), AF(University of Colorado, Center for Astrophysics and Space Astronomy, 389-UCB, Boulder, CO 80309, USA ), AG(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064, USA ), AH(Carnegie Observatories, Pasadena, CA 91101, USA ; Hubble Fellow.), AI(Leiden Observatory, Leiden University, NL-2300 RA Leiden, The Netherlands ), AJ(Institute for Astronomy, ETH Zurich, 8092 Zurich, Switzerland ), AK(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064, USA )
Publication:
The Astrophysical Journal Letters, Volume 709, Issue 2, pp. L133-L137 (2010). (ApJL Homepage)
Publication Date:
02/2010
Origin:
IOP
ApJ Keywords:
galaxies: evolution, galaxies: high-redshift
DOI:
10.1088/2041-8205/709/2/L133
Bibliographic Code:
2010ApJ...709L.133B

Abstract

We utilize the newly acquired, ultra-deep WFC3/IR observations over the Hubble Ultra Deep Field (HUDF) to search for star-forming galaxies at z ~ 8-8.5, only 600 million years from recombination, using a Y 105-dropout selection. The new 4.7 arcmin2 WFC3/IR observations reach to ~28.8 AB mag (5σ) in the Y 105 J 125 H 160 bands. These remarkable data reach ~1.5 AB mag deeper than the previous data over the HUDF, and now are an excellent match to the HUDF optical ACS data. For our search criteria, we use a two-color Lyman break selection technique to identify z ~ 8-8.5Y 105-dropouts. We find five likely z ~ 8-8.5 candidates. The sources have H 160-band magnitudes of ~28.3 AB mag and very blue UV-continuum slopes, with a median estimated β of lsim–2.5 (where f λ vprop λβ). This suggests that z ~ 8 galaxies are not only essentially dust free but also may have very young ages or low metallicities. The observed number of Y 105-dropout candidates is smaller than the 20 ± 6 sources expected assuming no evolution from z ~ 6, but is consistent with the five expected extrapolating the Bouwens et al. luminosity function (LF) results to z ~ 8. These results provide evidence that the evolution in the LF seen from z ~ 7 to z ~ 3 continues to z ~ 8. The remarkable improvement in the sensitivity of WFC3/IR has enabled Hubble Space Telescope to cross a threshold, revealing star-forming galaxies at z~ 8-9.

Based on observations made with the NASA/ESA Hubble Space Telescope, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with programs 11563, 9797.

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