A

Euclid Preparation. XIV. The Complete Calibration of the Color–Redshift Relation (C3R2) Survey: Data Release 3

The Astrophysical Journal Supplement Series, vol. 256, pp. 9

Abstract

Abstract The Complete Calibration of the Color–Redshift Relation (C3R2) survey is obtaining spectroscopic redshifts in order to map the relation between galaxy color and redshift to a depth of i ∼ 24.5 (AB). The primary goal is to enable sufficiently accurate photometric redshifts for Stage iv dark energy projects, particularly Euclid and the Nancy Grace Roman Space Telescope (Roman), which are designed to constrain cosmological parameters through weak lensing. We present 676 new high-confidence spectroscopic redshifts obtained by the C3R2 survey in the 2017B–2019B semesters using the DEIMOS, LRIS, and MOSFIRE multiobject spectrographs on the Keck telescopes. Combined with the 4454 redshifts previously published by this project, the C3R2 survey has now obtained and published 5130 high-quality galaxy spectra and redshifts. If we restrict consideration to only the 0.2 < z p < 2.6 range of interest for the Euclid cosmological goals, then with the current data release, C3R2 has increased the spectroscopic redshift coverage of the Euclid color space from 51% (as reported by Masters et al.) to the current 91%. Once completed and combined with extensive data collected by other spectroscopic surveys, C3R2 should provide the spectroscopic calibration set needed to enable photometric redshifts to meet the cosmology requirements for Euclid, and make significant headway toward solving the problem for Roman.

Authors 99

  1. Spencer A Stanford corresponding

    University of California, Davis

    Affiliation as printed

    Department of Physics and Astronomy, University of California, Davis, CA 95616, USA; stanford@physics.ucdavis.edu

    University of California, Davis, Davis, United States

  2. California Institute of Technology · Infrared Processing and Analysis Center

    Affiliation as printed

    Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USA

    California Institute of Technology, Pasadena, United States

  3. California Institute of Technology

    Affiliation as printed

    California institute of Technology, 1200 E California Boulevard, Pasadena, CA 91125, USA

    California Institute of Technology, Pasadena, United States

  4. Jet Propulsion Laboratory

    Affiliation as printed

    Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA

  5. California Institute of Technology · Helsinki Institute of Physics

    Affiliation as printed

    California institute of Technology, 1200 E California Boulevard, Pasadena, CA 91125, USA

    Helsinki Institute of Physics, Helsinki, Finland

  6. California Institute of Technology · Helsinki Institute of Physics

    Affiliation as printed

    California institute of Technology, 1200 E California Boulevard, Pasadena, CA 91125, USA

    Helsinki Institute of Physics, Helsinki, Finland

  7. California Institute of Technology · Helsinki Institute of Physics

    Affiliation as printed

    California institute of Technology, 1200 E California Boulevard, Pasadena, CA 91125, USA

    Helsinki Institute of Physics, Helsinki, Finland

  8. University of Copenhagen · Helsinki Institute of Physics

    Affiliation as printed

    Cosmic Dawn Center (DAWN), Niels Bohr Institute, University of Copenhagen, Vibenshuset, Lyngbyvej 2, DK-2100 Copenhagen, Denmark

    Helsinki Institute of Physics, Helsinki, Finland

  9. Jet Propulsion Laboratory · University of Jyväskylä

    Affiliation as printed

    Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA

    University of Jyväskylä, Jyvaskyla, Finland

  10. University of Hawaiʻi at Mānoa · University of Hawaii System

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    Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA

  11. University of California, Riverside

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    Physics and Astronomy Department, University of California, 900 University Avenue, Riverside, CA 92521, USA

  12. Institute of Space Sciences · Institut d'Estudis Espacials de Catalunya

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    Institut d’Estudis Espacials de Catalunya (IEEC), Carrer Gran Capitá 2-4, E-08034 Barcelona, Spain

    Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, E-08193 Barcelona, Spain

  13. University of Geneva

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    Department of Astronomy, University of Geneva, ch. dÉcogia 16, CH-1290 Versoix, Switzerland

  14. Centre National de la Recherche Scientifique · Université Paris-Saclay · Institut d'Astrophysique Spatiale

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    Université Paris-Saclay, CNRS, Institut d’astrophysique spatiale, F-91405, Orsay, France

  15. University of Portsmouth

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    Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, UK

  16. Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics

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    INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, I-40129 Bologna, Italy

  17. Osservatorio Astronomico di Padova

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  18. Max Planck Society · Max Planck Institute for Extraterrestrial Physics · Ludwig-Maximilians-Universität München

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    Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, D-85748 Garching, Germany

    Universitäts-Sternwarte München, Fakultät für Physik, Ludwig-Maximilians-Universität München, Scheinerstrasse 1, 81679 München, Germany

    Max Planck Society, Munich, Germany

  19. Max Planck Society · Max Planck Institute for Extraterrestrial Physics

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    Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, D-85748 Garching, Germany

    Max Planck Society, Munich, Germany

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    INAF-Osservatorio Astrofisico di Torino, Via Osservatorio 20, I-10025 Pino Torinese (TO), Italy

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  38. Istituto Nazionale di Fisica Nucleare, Sezione di Padova

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  42. National Institute for Astrophysics

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    INAF-IASF Milano, Via Alfonso Corti 12, I-20133 Milano, Italy

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    Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, D-85748 Garching, Germany

    Universitäts-Sternwarte München, Fakultät für Physik, Ludwig-Maximilians-Universität München, Scheinerstrasse 1, 81679 München, Germany

    Max Planck Society, Munich, Germany

  47. University of Oslo

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    Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, NO-0315 Oslo, Norway

  48. Leiden University · Leiden Observatory

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    Leiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands

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    Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA

  50. Max Planck Institute for Astronomy · von Hoerner & Sulger (Germany)

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    Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany

    von Hoerner & Sulger GmbH, SchloßPlatz 8, D-68723 Schwetzingen, Germany

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    Institut d’Astrophysique de Paris, 98bis Boulevard Arago, F-75014, Paris, France

  52. Max Planck Institute for Astronomy

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    Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany

  53. Jet Propulsion Laboratory

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    Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA

  54. Centre National de la Recherche Scientifique · Commissariat à l'Énergie Atomique et aux Énergies Alternatives · Université Paris-Saclay · Astrophysique, Instrumentation et Modélisation

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    AIM, CEA, CNRS, Université Paris-Saclay, Université de Paris, F-91191 Gif-sur-Yvette, France

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    Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK

  56. Lyon 1 Université · Centre National de la Recherche Scientifique · Institut de Physique des 2 Infinis de Lyon

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    Univ Lyon, Univ Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822, F-69622, Villeurbanne, France

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    Université de Genève, Département de Physique Théorique and Centre for Astroparticle Physics, 24 quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland

  59. University of Helsinki · Helsinki Institute of Physics

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    Department of Physics and Helsinki Institute of Physics, Gustaf Hällströmin katu 2, FI-00014 University of Helsinki, Finland

    Helsinki Institute of Physics, Helsinki, Finland

  60. European Space Agency · European Space Research and Technology Centre

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    European Space Agency/ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands

  61. Osservatorio Astrofisico di Torino

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    INAF-Osservatorio Astrofisico di Torino, Via Osservatorio 20, I-10025 Pino Torinese (TO), Italy

  62. University of Oslo

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    Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, NO-0315 Oslo, Norway

  63. Netherlands Institute for Radio Astronomy

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    NOVA optical infrared instrumentation group at ASTRON, Oude Hoogeveensedijk 4, 7991PD, Dwingeloo, The Netherlands

  64. Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics

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  66. Jet Propulsion Laboratory

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    Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA

  67. Durham University

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    Centre for Extragalactic Astronomy, Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK

  68. California Institute of Technology · Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics

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  70. Istituto Nazionale di Fisica Nucleare · Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics · University of Bologna

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  96. University of Groningen

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  97. California Institute of Technology · Infrared Processing and Analysis Center

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    Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USA

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References 37