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

Stanford, S. A.; Masters, D.; Darvish, B.; Stern, D.; Cohen, J. G.; Capak, P.; Hernitschek, N.; Davidzon, I.; Rhodes, J.; Sanders, D. B.; Mobasher, B.; Castander, F. J.; Paltani, S.; Aghanim, N.; Amara, A.; Auricchio, N.; Balestra, A.; Bender, R.; Bodendorf, C.; Bonino, D.; Branchini, E.; Brinchmann, J.; Capobianco, V.; Carbone, C.; Carretero, J.; Casas, R.; Castellano, M.; Cavuoti, S.; Cimatti, A.; Cledassou, R.; Conselice, C. J.; Corcione, L.; Costille, A.; Cropper, M.; Degaudenzi, H.; Douspis, M.; Dubath, F.; Dusini, S.; Fosalba, P.; Frailis, M.; Franceschi, E.; Franzetti, P.; Fumana, M.; Garilli, B.; Giocoli, C.; Grupp, F.; Haugan, S. V. H.; Hoekstra, H.; Holmes, W.; Hormuth, F.; Hudelot, P.; Jahnke, K.; Kiessling, A.; Kilbinger, M.; Kitching, T.; Kubik, B.; Kümmel, M.; Kunz, M.; Kurki-Suonio, H.; Laureijs, R.; Ligori, S.; Lilje, P. B.; Lloro, I.; Maiorano, E.; Marggraf, O.; Markovic, K.; Massey, R.; Meneghetti, M.; Meylan, G.; Moscardini, L.; Niemi, S. M.; Padilla, C.; Pasian, F.; Pedersen, K.; Pettorino, V.; Pires, S.; Poncet, M.; Popa, L.; Pozzetti, L.; Raison, F.; Roncarelli, M.; Rossetti, E.; Saglia, R.; Scaramella, R.; Schneider, P.; Secroun, A.; Seidel, G.; Serrano, S.; Sirignano, C.; Sirri, G.; Taylor, A. N.; Teplitz, H. I.; Tereno, I.; Toledo-Moreo, R.; Valentijn, E. A.; Valenziano, L.; Verdoes Kleijn, G. A.; Wang, Y.; Zamorani, G.; Zoubian, J.; Brescia, M.; Congedo, G.; Conversi, L.; Copin, Y.; Kermiche, S.; Kohley, R.; Medinaceli, E.; Mei, S.; Moresco, M.; Morin, B.; Munari, E.; Polenta, G.; Sureau, F.; Tallada Crespí, P.; Vassallo, T.; Zacchei, A.; Andreon, S.; Aussel, H.; Baccigalupi, C.; Balaguera-Antolínez, A.; Baldi, M.; Bardelli, S.; Biviano, A.; Borsato, E.; Bozzo, E.; Burigana, C.; Cabanac, R.; Camera, S.; Cappi, A.; Carvalho, C. S.; Casas, S.; Castignani, G.; Colodro-Conde, C.; Coupon, J.; Courtois, H. M.; Cuby, J.-G.; Da Silva, A.; de la Torre, S.; Di Ferdinando, D.; Duncan, C. A. J.; Dupac, X.; Fabricius, M.; Farina, M.; Farrens, S.; Ferreira, P. G.; Finelli, F.; Flose-Reimberg, P.; Fotopoulou, S.; Galeotta, S.; Ganga, K.; Gillard, W.; Gozaliasl, G.; Graciá-Carpio, J.; Keihanen, E.; Kirkpatrick, C. C.; Lindholm, V.; Mainetti, G.; Maino, D.; Martinet, N.; Marulli, F.; Maturi, M.; Maurogordato, S.; Metcalf, R. B.; Nakajima, R.; Neissner, C.; Nightingale, J. W.; Nucita, A. A.; Patrizii, L.; Potter, D.; Renzi, A.; Riccio, G.; Romelli, E.; Sánchez, A. G.; Sapone, D.; Schirmer, M.; Schultheis, M.; Scottez, V.; Stanco, L.; Tenti, M.; Teyssier, R.; Torradeflot, F.; Valiviita, J.; Viel, M.; Whittaker, L.; Zucca, E.

doi:10.3847/1538-4365/ac0833

Published September 2021 | Version Published + Accepted Version

Journal Article Open

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

1. University of California, Davis
2. Infrared Processing and Analysis Center
3. California Institute of Technology
4. Jet Propulsion Lab
5. University of Copenhagen
6. University of Hawaii at Manoa
7. University of California, Riverside
8. Institute of Space Sciences
9. Institut d'Estudis Espacials de Catalunya
10. University of Geneva
11. Institut d'Astrophysique Spatiale
12. University of Portsmouth
13. Osservatorio Astronomico di Padova
14. Ludwig-Maximilians-Universität München
15. Max Planck Institute for Extraterrestrial Physics
16. Osservatorio Astrofisico di Torino
17. INFN Sezione di Roma III
18. Roma Tre University
19. Astronomical Observatory of Rome
20. Centre for Astrophysics of the University of Porto
21. University of Porto
22. Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
23. Institute for High Energy Physics
24. University of Naples Federico II
25. INFN Sezione di Napoli
26. Astronomical Observatory of Capodimonte
27. University of Bologna
28. Institut National de Physique Nucléaire et de Physique des Particules
29. Centre National d'Études Spatiales
30. University of Manchester
31. French National Centre for Scientific Research
32. University College London
33. INFN Sezione di Padova
34. Trieste Astronomical Observatory
35. INFN Sezione di Bologna
36. University of Oslo
37. Leiden University
38. von Hoerner & Sulger (Germany)
39. Max Planck Institute for Astronomy
40. Institut d'Astrophysique de Paris
41. Astrophysique, Instrumentation et Modélisation
42. University of Lyon System
43. University of Helsinki
44. European Space Research and Technology Centre
45. Netherlands Institute for Radio Astronomy
46. University of Bonn
47. Durham University
48. École Polytechnique Fédérale de Lausanne
49. Aarhus University
50. Institute of Space Science
51. INFN Sezione di Roma I
52. Center for Particle Physics of Marseilles
53. University of Padua
54. University of Edinburgh
55. University of Lisbon
56. Polytechnic University of Cartagena
57. University of Groningen
58. European Space Research Institute
59. European Space Astronomy Centre
60. National Institute for Astrophysics
61. Astroparticle and Cosmology Laboratory
62. Agenzia Spaziale Italiana
63. Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
64. Brera Astronomical Observatory
65. Institute for Fundamental Physics of the Universe
66. International School for Advanced Studies
67. INFN Sezione di Trieste
68. University of La Laguna
69. Instituto de Astrofísica de Canarias
70. University of Ferrara
71. Istituto di Radioastronomia di Bologna
72. Research Institute in Astrophysics and Planetology
73. INFN Sezione di Torino
74. University of Turin
75. Observatoire de la Côte d'Azur
76. Lagrange Laboratory
77. University of Oxford
78. Institute for Space Astrophysics and Planetology
79. University of Bristol
80. Helsinki Institute of Physics
81. Centre de Calcul de l'Institut National de Physique Nucléaire et de Physique des Particules
82. University of Milan
83. INFN Sezione di Milano
84. Heidelberg University
85. INFN Sezione di Lecce
86. University of Salento
87. University of Zurich
88. University of Chile
89. University of Jyväskylä

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.

Additional Information

© 2021. The American Astronomical Society. Received 2021 March 11; revised 2021 May 24; accepted 2021 May 26; published 2021 August 31. A significant portion of the research and manuscript preparation took place during the COVID-19 global pandemic. The authors would like to thank all of those who risked their lives as essential workers in order for us to safely continue our work from home. The authors also thank the referee whose comments helped improve the clarity and presentation of our results. The research was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. This work was enabled by a NASA Keck grant. F.J.C. acknowledges support from grant ESP2017-89838 ad H2020 European Commission grant 776247. The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and NASA. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.

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Eprint ID: 110898
Resolver ID: CaltechAUTHORS:20210914-225403874

Describes: https://arxiv.org/abs/2106.11367 (URL)

NASA/JPL/Caltech
Ministerio de Ciencia, Innovación y Universidades (MICIU)
ESP2017-89838
European Research Council (ERC)
776247
W. M. Keck Foundation

Created: 2021-09-17

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Updated: 2021-09-17

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Caltech groups: Astronomy Department , Infrared Processing and Analysis Center (IPAC)

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

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