August
2022
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2022A&A...664A.196E
Authors
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Euclid Collaboration
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Saglia, R.
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De Nicola, S.
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Fabricius, M.
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Guglielmo, V.
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Snigula, J.
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Zöller, R.
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Bender, R.
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Heidt, J.
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Masters, D.
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Stern, D.
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Paltani, S.
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Amara, A.
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Auricchio, N.
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Baldi, M.
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Bodendorf, C.
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Bonino, D.
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Branchini, E.
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Brescia, M.
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Brinchmann, J.
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Camera, S.
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Capobianco, V.
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Carbone, C.
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Carretero, J.
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Castellano, M.
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Cavuoti, S.
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Cledassou, R.
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Congedo, G.
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Conselice, C. J.
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Conversi, L.
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Copin, Y.
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Corcione, L.
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Courbin, F.
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Cropper, M.
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Da Silva, A.
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Degaudenzi, H.
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Douspis, M.
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Dubath, F.
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Duncan, C. A. J.
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Dupac, X.
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Dusini, S.
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Farrens, S.
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Frailis, M.
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Franceschi, E.
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Galeotta, S.
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Garilli, B.
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Gillard, W.
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Gillis, B.
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Giocoli, C.
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Grazian, A.
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Grupp, F.
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Haugan, S. V. H.
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Hoekstra, H.
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Holmes, W.
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Hormuth, F.
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Hornstrup, A.
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Jahnke, K.
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Kümmel, M.
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Kermiche, S.
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Kiessling, A.
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Kunz, M.
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Kurki-Suonio, H.
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Laureijs, R.
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Ligori, S.
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Lilje, P. B.
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Lloro, I.
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Maiorano, E.
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Marggraf, O.
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Markovic, K.
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Marulli, F.
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Massey, R.
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McCracken, H. J.
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Melchior, M.
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Meylan, G.
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Moresco, M.
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Moscardini, L.
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Munari, E.
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Niemi, S. M.
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Padilla, C.
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Pasian, F.
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Pedersen, K.
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Percival, W. J.
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Pettorino, V.
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Pires, S.
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Poncet, M.
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Popa, L.
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Pozzetti, L.
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Raison, F.
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Renzi, A.
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Rhodes, J.
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Riccio, G.
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Romelli, E.
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Rossetti, E.
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Sapone, D.
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Sartoris, B.
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Schneider, P.
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Secroun, A.
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Seidel, G.
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Sirignano, C.
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Sirri, G.
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Stanco, L.
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Tallada-Crespí, P.
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Tavagnacco, D.
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Taylor, A. N.
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Tereno, I.
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Toledo-Moreo, R.
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Torradeflot, F.
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Tutusaus, I.
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Valentijn, E. A.
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Valenziano, L.
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Vassallo, T.
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Wang, Y.
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Zacchei, A.
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Zamorani, G.
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Zoubian, J.
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Andreon, S.
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Bardelli, S.
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Graciá-Carpio, J.
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Maino, D.
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Mauri, N.
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Tramacere, A.
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Zucca, E.
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Alvarez Ayllon, A.
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Aussel, H.
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Baccigalupi, C.
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Balaguera-Antolínez, A.
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Ballardini, M.
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Biviano, A.
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Bolzonella, M.
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Bozzo, E.
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Burigana, C.
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Cabanac, R.
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Cappi, A.
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Carvalho, C. S.
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Casas, S.
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Castignani, G.
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Cooray, A.
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Coupon, J.
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Courtois, H. M.
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Davini, S.
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Desprez, G.
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Dole, H.
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Escartin, J. A.
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Escoffier, S.
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Farina, M.
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Fotopoulou, S.
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Ganga, K.
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Garcia-Bellido, J.
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George, K.
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Giacomini, F.
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Gozaliasl, G.
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Hildebrandt, H.
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Hook, I.
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Ilbert, O.
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Kansal, V.
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Kashlinsky, A.
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Keihanen, E.
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Kirkpatrick, C. C.
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Loureiro, A.
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Macías-Pérez, J.
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Magliocchetti, M.
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Mainetti, G.
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Maoli, R.
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Martinelli, M.
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Martinet, N.
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Metcalf, R. B.
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Morgante, G.
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Nadathur, S.
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Nucita, A. A.
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Patrizii, L.
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Popa, V.
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Porciani, C.
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Potter, D.
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Pourtsidou, A.
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Reimberg, P.
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Sánchez, A. G.
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Sakr, Z.
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Schirmer, M.
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Sefusatti, E.
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Sereno, M.
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Stadel, J.
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Teyssier, R.
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Valieri, C.
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Valiviita, J.
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Veropalumbo, A.
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Viel, M.
Abstract
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The Complete Calibration of the Color-Redshift Relation survey (C3R2) is a spectroscopic program designed to empirically calibrate the galaxy color-redshift relation to the Euclid depth (IE = 24.5), a key ingredient for the success of Stage IV dark energy projects based on weak lensing cosmology. A spectroscopic calibration sample that is as representative as possible of the galaxies in the Euclid weak lensing sample is being collected, selecting galaxies from a self-organizing map (SOM) representation of the galaxy color space. Here, we present the results of a near-infrared H- and K-band spectroscopic campaign carried out using the LUCI instruments at the LBT. For a total of 251 galaxies, we present new highly reliable redshifts in the 1.3 ≤ z ≤ 1.7 and 2 ≤ z ≤ 2.7 ranges. The newly-determined redshifts populate 49 SOM cells that previously contained no spectroscopic measurements and almost twice the occupation numbers of an additional 153 SOM cells. A final optical ground-based observational effort is needed to calibrate the missing cells, in particular in the redshift range 1.7 ≤ z ≤ 2.7, which lack spectroscopic calibration. In the end, Euclid itself will deliver telluric-free near-IR spectra that can complete the calibration.
The LBT is an international collaboration among institutions in the United States, Italy, and Germany. The LBT Corporation partners are: LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; The University of Arizona on behalf of the Arizona university system; Istituto Nazionale di Astrofisica, Italy; The Ohio State University, and The Research Corporation, on behalf of The University of Notre Dame, University of Minnesota, and University of Virginia.
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