Deep ugrizY imaging and DEEP2/3 spectroscopy: A photometric redshift testbed for LSST and public release of data from the DEEP3 galaxy redshift survey

Rongpu Zhou, Michael C. Cooper, Jeffrey A. Newman, Matthew L.N. Ashby, James Aird, Christopher J. Conselice, Marc Davis, Aaron A. Dutton, S. M. Faber, Jerome J. Fang, G. G. Fazio, Puragra Guhathakurta, Dale Kocevski, David C. Koo, Kirpal Nandra, Andrew C. Phillips, David J. Rosario, Edward F. Schlafly, Jonathan R. Trump, Benjamin WeinerChristopher N.A. Willmer, Renbin Yan

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We present catalogues of calibrated photometry and spectroscopic redshifts in the Extended Groth Strip, intended for studies of photometric redshifts (photo-z's). The data includes ugriz photometry from Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) and Y-band photometry from the Subaru Suprime camera, as well as spectroscopic redshifts from the DEEP2, DEEP3, and 3D-HST surveys. These catalogues incorporate corrections to produce effectively matched-aperture photometry across all bands, based upon object size information available in the catalogue and Moffat profile point spread function fits. We test this catalogue with a simple machine learning-based photometric redshift algorithm based upon Random Forest regression, and find that the corrected aperture photometry leads to significant improvement in photo-z accuracy compared to the original SEXTRACTOR catalogues from CFHTLS and Subaru. The deep ugrizY photometry and spectroscopic redshifts are well suited for empirical tests of photometric redshift algorithms for LSST. The resulting catalogues are publicly available at We include a basic summary of the strategy of the DEEP3 Galaxy Redshift Survey to accompany the recent public release of DEEP3 data.

Original languageEnglish
Pages (from-to)4565-4584
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Oct 1 2019

Bibliographical note

Funding Information:
This work is partly based on observations taken by the 3D-HST Treasury Program (GO 12177 and 12328) with the NASA/ESA HST, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.

Funding Information:
08-08133, AST-08-07630, and AST-08-06732. The development of the photometric redshift testbed presented in this paper was funded by Department of Energy grant DE-SC0007914.

Funding Information:
Funding for the DEEP2 Galaxy Redshift Survey has been provided by National Science Foundation grants AST-95-09298, AST-0071048, AST-0507428, AST-0507483, and NASA Long Term Space Astrophysics Research Program grant NNG04GC89G. DEEP3 was funded by National Science Foundation grants AST-

Funding Information:
The Pan-STARRS1 Surveys (PS1) and the PS1 public science archive have been made possible through contributions by the Institute for Astronomy, the University of Hawaii, the Pan-STARRS Project Office, the Max-Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg and the Max Planck Institute for Extraterrestrial Physics, Garching, The Johns Hopkins University, Durham University, the University of Edinburgh, the Queen’s University Belfast, the Harvard-Smithsonian Center for Astrophysics, the Las Cumbres Observatory Global Telescope Network Incorporated, the National Central University of Taiwan, the Space Telescope Science Institute, the National Aeronautics and Space Administration under Grant No. NNX08AR22G issued through the Planetary Science Division of the NASA Science Mission Directorate, the National Science Foundation Grant No. AST-1238877, the University of Maryland, Eotvos Lorand University (ELTE), the Los Alamos National Laboratory, and the Gordon and Betty Moore Foundation.

Funding Information:
DJR acknowledges the support of the Science and Technology Facilities Council (STFC) through grant ST/P000541/1.

Funding Information:
Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS Web Site is

Publisher Copyright:
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society


  • Catalogues
  • Galaxies: distances
  • Redshifts
  • Surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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