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Published October 2020 | Published + Submitted
Journal Article Open

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

Guglielmo, V.
Saglia, R.
Castander, F. J.
Galametz, A.
Paltani, S.
Bender, R.
Bolzonella, M.
Capak, P. ORCID icon
Ilbert, O. ORCID icon
Masters, D. C. ORCID icon
Stern, D. ORCID icon
Andreon, S.
Auricchio, N.
Balaguera-Antolínez, A.
Baldi, M.
Bardelli, S.
Biviano, A.
Bodendorf, C.
Bonino, D.
Bozzo, E.
Branchini, E.
Brau-Nogue, S.
Brescia, M.
Burigana, C.
Cabanac, R. A.
Camera, S.
Capobianco, V.
Cappi, A.
Carbone, C.
Carretero, J.
Carvalho, C. S.
Casas, R.
Casas, S.
Castellano, M.
Castignani, G.
Cavuoti, S.
Cimatti, A.
Cledassou, R.
Colodro-Conde, C.
Congedo, G.
Conselice, C. J.
Conversi, L.
Copin, Y.
Corcione, L.
Costille, A.
Coupon, J.
Courtois, H. M.
Cropper, M.
Da Silva, A.
de la Torre, S.
Di Ferdinando, D.
Dubath, F.
Duncan, C. A. J.
Dupac, X.
Dusini, S.
Fabricius, M.
Farrens, S.
Ferreira, P. G.
Fotopoulou, S.
Frailis, M.
Franceschi, E.
Fumana, M.
Galeotta, S.
Garilli, B.
Gillis, B.
Giocoli, C.
Gozaliasl, G.
Graciá-Carpio, J.
Grupp, F.
Guzzo, L.
Hildebrandt, H.
Hoekstra, H.
Hormuth, F.
Israel, H.
Jahnke, K.
Keihanen, E.
Kermiche, S.
Kilbinger, M.
Kirkpatrick, C. C.
Kitching, T.
Kubik, B.
Kunz, M.
Kurki-Suonio, H.
Laureijs, R.
Ligori, S.
Lilje, P. B.
Lloro, I.
Maino, D.
Maiorano, E.
Maraston, C.
Marggraf, O.
Martinet, N.
Marulli, F.
Massey, R.
Maurogordato, S.
Medinaceli, E.
Mei, S.
Meneghetti, M.
Benton Metcalf, R.
Meylan, G.
Moresco, M.
Moscardini, L.
Munari, E.
Nakajima, R.
Neissner, C.
Niemi, S.
Nucita, A. A.
Padilla, C.
Pasian, F.
Patrizii, L.
Pocino, A.
Poncet, M.
Pozzetti, L.
Raison, F.
Renzi, A.
Rhodes, J. D. ORCID icon
Riccio, G.
Romelli, E.
Roncarelli, M.
Rossetti, E.
Sánchez, A. G.
Sapone, D.
Schneider, P.
Scottez, V.
Secroun, A.
Serrano, S.
Sirignano, C.
Sirri, G.
Sureau, F.
Tallada-Crespí, P.
Tavagnacco, D.
Taylor, A. N.
Tenti, M.
Tereno, I.
Toledo-Moreo, R.
Torradeflot, F.
Tramacere, A.
Valenziano, L.
Vassallo, T.
Wang, Y.
Welikala, N.
Wetzstein, M.
Whittaker, L.
Zacchei, A.
Zamorani, G.
Zoubian, J.
Zucca, E.
Euclid Collaboration

Abstract

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.

Additional Information

© V. Guglielmo et al. 2020. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), 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 (http://www.euclid-ec.org). 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".

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Created:
August 19, 2023
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