Rafelski, MarcTeplitz, Harry I.Gardner, Jonathan P.Coe, DanBond, Nicholas A.Koekemoer, Anton M.Grogin, NormanKurczynski, PeterMcgrath, Elizabeth J.Bourque, MatthewAtek, HakimBrown, Thomas M.Colbert, James W.Codoreanu, AlexFerguson, Henry C.Finkelstein, Steven L.Gawiser, EricGiavalisco, MauroGronwall, CarylHanish, Daniel J.Lee, Kyoung-SooMehta, VihangDe Mello, Duilia F.Ravindranath, SwaraRyan, Russell E.Scarlata, ClaudiaSiana, BrianSoto, EmmarisVoyer, Elysse N.2015-09-282015-09-282015-09-28201510.1088/0004-6256/150/1/31https://infoscience.epfl.ch/handle/20.500.14299/118993WOS:000357744400031We present photometry and derived redshifts from up to eleven bandpasses for 9927 galaxies in the Hubble Ultra Deep field (UDF), covering an observed wavelength range from the near-ultraviolet (NUV) to the near-infrared (NIR) with Hubble Space Telescope observations. Our Wide Field Camera 3 (WFC3)/UV F225W, F275W, and F336W image mosaics from the ultra-violet UDF (UVUDF) imaging campaign are newly calibrated to correct for charge transfer inefficiency, and use new dark calibrations to minimize background gradients and pattern noise. Our NIR WFC3/IR image mosaics combine the imaging from the UDF09 and UDF12 campaigns with CANDELS data to provide NIR coverage for the entire UDF field of view. We use aperture-matched point-spread function corrected photometry to measure photometric redshifts in the UDF, sampling both the Lyman break and Balmer break of galaxies at z similar to 0.8-3.4, and one of the breaks over the rest of the redshift range. Our comparison of these results with a compilation of robust spectroscopic redshifts shows an improvement in the galaxy photometric redshifts by a factor of two in scatter and a factor three in outlier fraction (OLF) over previous UDF catalogs. The inclusion of the new NUV data is responsible for a factor of two decrease in the OLF compared to redshifts determined from only the optical and NIR data, and improves the scatter at z < 0.5 and at z > 2. The panchromatic coverage of the UDF from the NUV through the NIR yields robust photometric redshifts of the UDF, with the lowest OLF available.cosmology: observationsgalaxies: distances and redshiftsgalaxies: evolutiongalaxies: high-redshiftgalaxies: photometrytext::journal::journal article::research article