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Date and Time of the Query: 2019-05-22 T22:37:35 PDT
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For refcode 2010ApJ...709L.133B:
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Copyright by American Astronomical Society. Reproduced by permission
2010ApJ...709L.133B Discovery of z ~ 8 Galaxies in the Hubble Ultra Deep Field from Ultra-Deep WFC3/IR Observations Bouwens, R. J.; Illingworth, G. D.; Oesch, P. A.; Stiavelli, M.; van Dokkum, P.; Trenti, M.; Magee, D.; Labbe, I.; Franx, M.; Carollo, C. M.; Gonzalez, V. 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 arcmin^2^ WFC3/IR observations reach to ~28.8 AB mag (5{sigma}) 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 beta of <~--2.5 (where f_{lambda}_ v{prop} {lambda}^{beta}^). 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. Key words: galaxies: evolution, galaxies: high-redshift
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