Abstract
The Hubble Ultra Deep Field (HUDF) offers a unique opportunity to study high-redshift starbursts with high spatial resolution. The combination of ACS optical and NICMOS near-IR images provide a measure of the redshift, intrinsic SED and extinction. This analysis finds 39 galaxies with SFRs in excess of 50 M☉ yr−1. The typical starburst galaxy has a very blue SED and relatively high extinction. All of the HUDF starburst galaxies have redshifts higher than 0.9 but no starburst galaxies lie at redshifts greater than 3.5. The highest SFR in the HUDF is 560 M☉ yr−1. The top ten SFR galaxies, all with SFRs exceeding 100 M☉ yr−1 lie in the redshift range between 1.7 and 3.1. This defines an epoch of massive galaxy assembly similar to that seen in the Northern Hubble Deep Field (NHDF). Unlike the HUDF, however, the NHDF contains starburst galaxies up to the analysis redshift limit of 6. Both fields subtend small areas and any conclusions relative to universal star formation should be viewed with caution.
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