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We combine new high sensitivity ultraviolet (UV) imaging from the Wide FieldCamera 3 (WFC3) on the Hubble Space Telescope (HST) with existing deepHST/Advanced Camera for Surveys (ACS) optical images from the GreatObservatories Origins Deep Survey (GOODS) program to identify UV-dropouts,which are Lyman break galaxy (LBG) candidates at z~1-3. These new HST/WFC3observations were taken over 50 sq.arcmin in the GOODS-South field as a part ofthe Early Release Science program. The uniqueness of these new UV data is thatthey are observed in 3 UV/optical (WFC3 UVIS) channel filters (F225W, F275W andF336W), which allows us to identify three different sets of UV-dropout samples.We apply Lyman break dropout selection criteria to identify F225W-, F275W- andF336W-dropouts, which are z~1.7, 2.1 and 2.7 LBG candidates, respectively. Ourresults are as follows: (1) these WFC3 UVIS filters are very reliable inselecting LBGs with z~2.0, which helps to reduce the gap between the wellstudied z~>3 and z~0 regimes, (2) the combined number counts agrees very wellwith the observed change in the surface densities as a function of redshiftwhen compared with the higher redshift LBG samples; and (3) the best-fitSchechter function parameters from the rest-frame UV luminosity functions atthree different redshifts fit very well with the evolutionary trend of thecharacteristic absolute magnitude, and the faint-end slope, as a function ofredshift. This is the first study to illustrate the usefulness of the WFC3 UVISchannel observations to select z<3 LBGs. The addition of the new WFC3 on theHST has made it possible to uniformly select LBGs from z~1 to z~9, andsignificantly enhance our understanding of these galaxies using HST sensitivityand resolution.

UV-dropout Galaxies in the GOODS-South Field from WFC3 Early Release Science Observations