Journal article

DISCOVERY OF z similar to 8 GALAXIES IN THE HUBBLE ULTRA DEEP FIELD FROM ULTRA-DEEP WFC3/IR OBSERVATIONS

RJ Bouwens, GD Illingworth, PA Oesch, M Stiavelli, P van Dokkum, M Trenti, D Magee, I Labbe, M Franx, CM Carollo, V Gonzalez

The Astrophysical Journal Letters | IOP PUBLISHING LTD | Published : 2010

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 - dropout selection. The new 4.7 arcmin WFC3/IR observations reach to 28.8 ABmag (5σ) in the Y J H 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 -dropouts. We find five likely z ∼ 8-8.5 candidates. The sources have H -band magnitudes of 28.3 ABmag and very blue UV-continuum slo..

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University of Melbourne Researchers

Grants

Awarded by NASA


Funding Acknowledgements

We acknowledge our program coordinator William Janusweski for his exceptional care in helping to set up our program and observing configuration. We are grateful to all those at NASA, STScI, and throughout the community who have worked so diligently to make Hubble the remarkable observatory that it is today. The servicing missions, like the recent SM4, have rejuvenated HST and made it an extraordinarily productive scientific facility time and time again. We greatly appreciate the support of policymakers, and all those in the flight and servicing programs who contributed to the repeated successes of the HST servicing missions. We acknowledge the support of NASA grant NAG5-7697 and NASA grant HST-GO-11563.01. P.A.O. acknowledges support from the Swiss National Foundation.