C O ] 2 1 Ju l 2 01 0 UV-dropout Galaxies in the GOODS-South Field from WFC 3 Early Release Science Observations

Department of Physics and Astronomy, University of California, Riverside, CA 92521 Department of Physics and Astronomy, University of California, Davis, CA 92616 School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287-1404 Center for Cosmology and AstroParticle Physics, The Ohio State University, Columbus, OH 43210 Observatories of the Carnegie Institute of Washington, Pasadena, CA 91101, USA Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325 Space Telescope Science Institute, Baltimore, MD 21218 Department of Astronomy, University of Washington, Seattle, WA 98195-1580 Department of Astronomy, University of Massachusetts, Amherst, MA 01003 School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, United Kingdom Research School of Astronomy & Astrophysics, The Australian National University, ACT 2611, Australia Association of Universities for Research in Astronomy, Washington, DC 20005 Institute for Astronomy, University of Hawaii, Honolulu, HI 96822 Department of Astronomy, New Mexico State University, Las Cruces, NM 88003 NASA–Goddard Space Flight Center, Greenbelt, MD 20771 Istituto di Astrofisica Spaziale e Fisica Cosmica, INAF, Via Gobetti 101, 40129 Bologna, Italy National Optical Astronomy Observatories, Tucson, AZ 85726-6732 Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom NASA–Jet Propulsion Laboratory, Pasadena, CA 91109 Cerro Tololo Inter-American Observatory, La Serena, Chile NASA–Ames Research Center, Moffett Field, CA 94035