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Euclid preparation. VIII. The Complete Calibration of the Colour–Redshift Relation survey: VLT/KMOS observations and data release

Guglielmo, V. and Saglia, R. and Castander, F. J. and Galametz, A. and Paltani, S. and Bender, R. and Bolzonella, M. and Capak, P. and Ilbert, O. and Masters, D. C. and Stern, D. and Andreon, S. and Auricchio, N. and Balaguera-Antolínez, A. and Baldi, M. and Bardelli, S. and Biviano, A. and Bodendorf, C. and Bonino, D. and Bozzo, E. and Branchini, E. and Brau-Nogue, S. and Brescia, M. and Burigana, C. and Cabanac, R. A. and Camera, S. and Capobianco, V. and Cappi, A. and Carbone, C. and Carretero, J. and Carvalho, C. S. and Casas, R. and Casas, S. and Castellano, M. and Castignani, G. and Cavuoti, S. and Cimatti, A. and Cledassou, R. and Colodro-Conde, C. and Congedo, G. and Conselice, C. J. and Conversi, L. and Copin, Y. and Corcione, L. and Costille, A. and Coupon, J. and Courtois, H. M. and Cropper, M. and Da Silva, A. and de la Torre, S. and Di Ferdinando, D. and Dubath, F. and Duncan, C. A. J. and Dupac, X. and Dusini, S. and Fabricius, M. and Farrens, S. and Ferreira, P. G. and Fotopoulou, S. and Frailis, M. and Franceschi, E. and Fumana, M. and Galeotta, S. and Garilli, B. and Gillis, B. and Giocoli, C. and Gozaliasl, G. and Graciá-Carpio, J. and Grupp, F. and Guzzo, L. and Hildebrandt, H. and Hoekstra, H. and Hormuth, F. and Israel, H. and Jahnke, K. and Keihanen, E. and Kermiche, S. and Kilbinger, M. and Kirkpatrick, C. C. and Kitching, T. and Kubik, B. and Kunz, M. and Kurki-Suonio, H. and Laureijs, R. and Ligori, S. and Lilje, P. B. and Lloro, I. and Maino, D. and Maiorano, E. and Maraston, C. and Marggraf, O. and Martinet, N. and Marulli, F. and Massey, R. and Maurogordato, S. and Medinaceli, E. and Mei, S. and Meneghetti, M. and Benton Metcalf, R. and Meylan, G. and Moresco, M. and Moscardini, L. and Munari, E. and Nakajima, R. and Neissner, C. and Niemi, S. and Nucita, A. A. and Padilla, C. and Pasian, F. and Patrizii, L. and Pocino, A. and Poncet, M. and Pozzetti, L. and Raison, F. and Renzi, A. and Rhodes, J. D. and Riccio, G. and Romelli, E. and Roncarelli, M. and Rossetti, E. and Sánchez, A. G. and Sapone, D. and Schneider, P. and Scottez, V. and Secroun, A. and Serrano, S. and Sirignano, C. and Sirri, G. and Sureau, F. and Tallada-Crespí, P. and Tavagnacco, D. and Taylor, A. N. and Tenti, M. and Tereno, I. and Toledo-Moreo, R. and Torradeflot, F. and Tramacere, A. and Valenziano, L. and Vassallo, T. and Wang, Y. and Welikala, N. and Wetzstein, M. and Whittaker, L. and Zacchei, A. and Zamorani, G. and Zoubian, J. and Zucca, E. (2020) Euclid preparation. VIII. The Complete Calibration of the Colour–Redshift Relation survey: VLT/KMOS observations and data release. Astronomy and Astrophysics, 642 . Art. No. A192. ISSN 0004-6361. doi:10.1051/0004-6361/202038334.

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The Complete Calibration of the Colour–Redshift Relation survey (C3R2) is a spectroscopic effort involving ESO and Keck facilities designed specifically to empirically calibrate the galaxy colour–redshift relation – P(z|C) to the Euclid depth (i_(AB) = 24.5) and is intimately linked to the success of upcoming Stage IV dark energy missions based on weak lensing cosmology. The aim is to build a spectroscopic calibration sample that is as representative as possible of the galaxies of the Euclid weak lensing sample. In order to minimise the number of spectroscopic observations necessary to fill the gaps in current knowledge of the P(z|C), self-organising map (SOM) representations of the galaxy colour space have been constructed. Here we present the first results of an ESO@VLT Large Programme approved in the context of C3R2, which makes use of the two VLT optical and near-infrared multi-object spectrographs, FORS2 and KMOS. This data release paper focuses on high-quality spectroscopic redshifts of high-redshift galaxies observed with the KMOS spectrograph in the near-infrared H- and K-bands. A total of 424 highly-reliable redshifts are measured in the 1.3 ≤ z ≤ 2.5 range, with total success rates of 60.7% in the H-band and 32.8% in the K-band. The newly determined redshifts fill 55% of high (mainly regions with no spectroscopic measurements) and 35% of lower (regions with low-resolution/low-quality spectroscopic measurements) priority empty SOM grid cells. We measured Hα fluxes in a 1.″2 radius aperture from the spectra of the spectroscopically confirmed galaxies and converted them into star formation rates. In addition, we performed an SED fitting analysis on the same sample in order to derive stellar masses, E(B − V), total magnitudes, and SFRs. We combine the results obtained from the spectra with those derived via SED fitting, and we show that the spectroscopic failures come from either weakly star-forming galaxies (at z <  1.7, i.e. in the H-band) or low S/N spectra (in the K-band) of z > 2 galaxies.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
http://www.euclid-ec.orgOrganizationEuclid Consortium
Capak, P.0000-0003-3578-6843
Ilbert, O.0000-0002-7303-4397
Masters, D. C.0000-0001-5382-6138
Stern, D.0000-0003-2686-9241
Rhodes, J. D.0000-0002-4485-8549
Additional Information:© V. Guglielmo et al. 2020. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Open Access funding provided by Max Planck Society. Received 4 May 2020 / Accepted 16 June 2020. The Euclid Consortium acknowledges the European Space Agency and the support of a number of agencies and institutes that have supported the development of Euclid. A detailed complete list is available on the Euclid website ( In particular the Academy of Finland, the Agenzia Spaziale Italiana, the Belgian Science Policy, the Canadian Euclid Consortium, the Centre National d’Etudes Spatiales, the Deutsches Zentrum für Luft- und Raumfahrt, the Danish Space Research Institute, the Fundação para a Ciênca e a Tecnologia, the Ministerio de Economia y Competitividad, the National Aeronautics and Space Administration, the Netherlandse Onderzoekschool Voor Astronomie, the Norvegian Space Center, the Romanian Space Agency, the State Secretariat for Education, Research and Innovation (SERI) at the Swiss Space Office (SSO), and the United Kingdom Space Agency. Based on observations collected at the European Southern Observatory under ESO programme 199.A-0732 (B,D,F,H). VG, RS, AG and RB acknowledge support by the Deutsches Zentrum fur Luft- und Raumfahrt (DLR) grant 50 QE 1101. FJC acknowledges support from the Spanish Ministry of Science, Innovation and Universities through grant ESP2017-89838-C3-1-R, and the H2020 programme of the European Commission through grant 776247. AG acknowledges a Sinergia grant from the Swiss National Science Foundation. SA thank the support PRIN MIUR 2015 “Cosmology and Fundamental Physics: Illuminating the Dark Universe with Euclid”.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Max Planck SocietyUNSPECIFIED
European Space Agency (ESA)UNSPECIFIED
Academy of FinlandUNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Belgian Federal Science Policy Office (BELSPO)UNSPECIFIED
Canadian Euclid ConsortiumUNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Deutsches Zentrum für Luft- und Raumfahrt (DLR)50 QE 1101
Danish Space Research InstituteUNSPECIFIED
Fundação para a Ciênca e a Tecnologia (FCT)UNSPECIFIED
Ministerio de Economia y Competitividad (MINECO)UNSPECIFIED
Nederlandse Onderzoekschool voor de Astronomie (NOVA)UNSPECIFIED
Norvegian Space CenterUNSPECIFIED
Romanian Space AgencyUNSPECIFIED
State Secretariat for Education, Research and Innovation (SERI)UNSPECIFIED
Swiss Space Office (SSO)UNSPECIFIED
United Kingdom Space Agency (UKSA)UNSPECIFIED
Ministerio de Ciencia, Innovación y Universidades (MICIU)ESP2017-89838-C3-1-R
European Research Council (ERC)776247
Swiss National Science Foundation (SNSF)UNSPECIFIED
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)UNSPECIFIED
Subject Keywords:catalogs / surveys / cosmology: observations / galaxies: distances and redshifts
Record Number:CaltechAUTHORS:20201021-160147574
Persistent URL:
Official Citation:Euclid preparation - VIII. The Complete Calibration of the Colour–Redshift Relation survey: VLT/KMOS observations and data release Euclid Collaboration, V. Guglielmo, R. Saglia, F. J. Castander, A. Galametz, S. Paltani, R. Bender, M. Bolzonella, P. Capak, O. Ilbert, D. C. Masters, D. Stern, S. Andreon, N. Auricchio, A. Balaguera-Antolínez, M. Baldi, S. Bardelli, A. Biviano, C. Bodendorf, D. Bonino, E. Bozzo, E. Branchini, S. Brau-Nogue, M. Brescia, C. Burigana, R. A. Cabanac, S. Camera, V. Capobianco, A. Cappi, C. Carbone, J. Carretero, C. S. Carvalho, R. Casas, S. Casas, M. Castellano, G. Castignani, S. Cavuoti, A. Cimatti, R. Cledassou, C. Colodro-Conde, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, L. Corcione, A. Costille, J. Coupon, H. M. Courtois, M. Cropper, A. Da Silva, S. de la Torre, D. Di Ferdinando, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, M. Fabricius, S. Farrens, P. G. Ferreira, S. Fotopoulou, M. Frailis, E. Franceschi, M. Fumana, S. Galeotta, B. Garilli, B. Gillis, C. Giocoli, G. Gozaliasl, J. Graciá-Carpio, F. Grupp, L. Guzzo, H. Hildebrandt, H. Hoekstra, F. Hormuth, H. Israel, K. Jahnke, E. Keihanen, S. Kermiche, M. Kilbinger, C. C. Kirkpatrick, T. Kitching, B. Kubik, M. Kunz, H. Kurki-Suonio, R. Laureijs, S. Ligori, P. B. Lilje, I. Lloro, D. Maino, E. Maiorano, C. Maraston, O. Marggraf, N. Martinet, F. Marulli, R. Massey, S. Maurogordato, E. Medinaceli, S. Mei, M. Meneghetti, R. Benton Metcalf, G. Meylan, M. Moresco, L. Moscardini, E. Munari, R. Nakajima, C. Neissner, S. Niemi, A. A. Nucita, C. Padilla, F. Pasian, L. Patrizii, A. Pocino, M. Poncet, L. Pozzetti, F. Raison, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, M. Roncarelli, E. Rossetti, A. G. Sánchez, D. Sapone, P. Schneider, V. Scottez, A. Secroun, S. Serrano, C. Sirignano, G. Sirri, F. Sureau, P. Tallada-Crespí, D. Tavagnacco, A. N. Taylor, M. Tenti, I. Tereno, R. Toledo-Moreo, F. Torradeflot, A. Tramacere, L. Valenziano, T. Vassallo, Y. Wang, N. Welikala, M. Wetzstein, L. Whittaker, A. Zacchei, G. Zamorani, J. Zoubian and E. Zucca A&A, 642 (2020) A192 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106198
Deposited By: George Porter
Deposited On:22 Oct 2020 15:58
Last Modified:16 Nov 2021 18:51

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