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Published July 2015 | Published + Submitted
Journal Article Open

UVUDF: Ultraviolet Through Near-infrared Catalog and Photometric Redshifts of Galaxies in the Hubble Ultra Deep Field

Abstract

We 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 ~ 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.

Additional Information

© 2015 The American Astronomical Society. Received 2015 February 13; accepted 2015 May 2; published 2015 July 7. We would like to thank Sylvia Baggett and Jay Anderson at the Space Telescope Science Institute for their help with solving new calibration and CTE challenges in the Epoch 3 NUV data. We thank Gabe Brammer, Kate Whitaker, Chun Ly, and Daniel Angerhausen for useful discussions. We also thank the referee, Dr. Michael Drinkwater, for his helpful comments. Support for HST Program GO-12534 was provided by NASA through grants from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. M.R. also acknowledges support from an appointment to the NASA Postdoctoral Program at Goddard Space Flight Center, as well as support from HST GO-13389 and HST GO-13309. E.S. acknowledges support from the Harriett G. Jenkins Graduate Fellowship Program, grant NNX13AT09H. Facilities: HST (WFC/ACS, WFC3/UVIS, WFC3/IR) - Hubble Space Telescope satellite.

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Published - 1538-3881_150_1_31.pdf

Submitted - 1505.01160v1.pdf

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Additional details

Created:
August 22, 2023
Modified:
October 23, 2023