Euclid preparation: XX. The Complete Calibration of the Color-Redshift Relation survey: LBT observations and data release
Creators: name: Euclid Collaboration
name: Saglia, R.
name: De Nicola, S.
name: Fabricius, M.
name: Guglielmo, V.
name: Snigula, J.
name: Zöller, R.
name: Bender, R.
name: Heidt, J.
name: Masters, D.
name: Stern, D.
name: Paltani, S.
name: Amara, A.
name: Auricchio, N.
name: Baldi, M.
name: Bodendorf, C.
name: Bonino, D.
name: Branchini, E.
name: Brescia, M.
name: Brinchmann, J.
name: Camera, S.
name: Capobianco, V.
name: Carbone, C.
name: Carretero, J.
name: Castellano, M.
name: Cavuoti, S.
name: Cledassou, R.
name: Congedo, G.
name: Conselice, C. J.
name: Conversi, L.
name: Copin, Y.
name: Corcione, L.
name: Courbin, F.
name: Cropper, M.
name: Da Silva, A.
name: Degaudenzi, H.
name: Douspis, M.
name: Dubath, F.
name: Duncan, C. A. J.
name: Dupac, X.
name: Dusini, S.
name: Farrens, S.
name: Frailis, M.
name: Franceschi, E.
name: Galeotta, S.
name: Garilli, B.
name: Gillard, W.
name: Gillis, B.
name: Giocoli, C.
name: Grazian, A.
name: Grupp, F.
name: Haugan, S. V. H.
name: Hoekstra, H.
name: Holmes, W.
name: Hormuth, F.
name: Hornstrup, A.
name: Jahnke, K.
name: Kümmel, M.
name: Kermiche, S.
name: Kiessling, A.
name: Kunz, M.
name: Kurki-Suonio, H.
name: Laureijs, R.
name: Ligori, S.
name: Lilje, P. B.
name: Lloro, I.
name: Maiorano, E.
name: Marggraf, O.
name: Markovic, K.
name: Marulli, F.
name: Massey, R.
name: McCracken, H. J.
name: Melchior, M.
name: Meylan, G.
name: Moresco, M.
name: Moscardini, L.
name: Munari, E.
name: Niemi, S. M.
name: Padilla, C.
name: Pasian, F.
name: Pedersen, K.
name: Percival, W. J.
name: Pettorino, V.
name: Pires, S.
name: Poncet, M.
name: Popa, L.
name: Pozzetti, L.
name: Raison, F.
name: Renzi, A.
name: Rhodes, J.
name: Riccio, G.
name: Romelli, E.
name: Rossetti, E.
name: Sapone, D.
name: Sartoris, B.
name: Schneider, P.
name: Secroun, A.
name: Seidel, G.
name: Sirignano, C.
name: Sirri, G.
name: Stanco, L.
name: Tallada-Crespí, P.
name: Tavagnacco, D.
name: Taylor, A. N.
name: Tereno, I.
name: Toledo-Moreo, R.
name: Torradeflot, F.
name: Tutusaus, I.
name: Valentijn, E. A.
name: Valenziano, L.
name: Vassallo, T.
name: Wang, Y.
name: Zacchei, A.
name: Zamorani, G.
name: Zoubian, J.
name: Andreon, S.
name: Bardelli, S.
name: Graciá-Carpio, J.
name: Maino, D.
name: Mauri, N.
name: Tramacere, A.
name: Zucca, E.
name: Ayllon, A. Alvarez
name: Aussel, H.
name: Baccigalupi, C.
name: Balaguera-Antolínez, A.
name: Ballardini, M.
name: Biviano, A.
name: Bolzonella, M.
name: Bozzo, E.
name: Burigana, C.
name: Cabanac, R.
name: Cappi, A.
name: Carvalho, C. S.
name: Casas, S.
name: Castignani, G.
name: Cooray, A.
name: Coupon, J.
name: Courtois, H. M.
name: Davini, S.
name: Desprez, G.
name: Dole, H.
name: Escartin, J. A.
name: Escoffier, S.
name: Farina, M.
name: Fotopoulou, S.
name: Ganga, K.
name: Garcia-Bellido, J.
name: George, K.
name: Giacomini, F.
name: Gozaliasl, G.
name: Hildebrandt, H.
name: Hook, I.
name: Ilbert, O.
name: Kansal, V.
name: Kashlinsky, A.
name: Keihanen, E.
name: Kirkpatrick, C. C.
name: Loureiro, A.
name: Macías-Pérez, J.
name: Magliocchetti, M.
name: Mainetti, G.
name: Maoli, R.
name: Martinelli, M.
name: Martinet, N.
name: Metcalf, R. B.
name: Morgante, G.
name: Nadathur, S.
name: Nucita, A. A.
name: Patrizii, L.
name: Popa, V.
name: Porciani, C.
name: Potter, D.
name: Pourtsidou, A.
name: Reimberg, P.
name: Sánchez, A. G.
name: Sakr, Z.
name: Schirmer, M.
name: Sefusatti, E.
name: Sereno, M.
name: Stadel, J.
name: Teyssier, R.
name: Valieri, C.
name: Valiviita, J.
name: Veropalumbo, A.
name: Viel, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The Complete Calibration of the Color-Redshift Relation survey (C3R2) is a spectroscopic programme designed to empirically calibrate the galaxy color-redshift relation to the Euclid depth (I_E=24.5), a key ingredient for the success of Stage IV dark energy projects based on weak lensing cosmology. A spectroscopic calibration sample 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-bands 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&lt;= z &lt;=1.7 and 2&lt;= z&lt;=2.7 ranges. The newly-determined redshifts populate 49 SOM cells which previously contained no spectroscopic measurements and almost double 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&lt;= z&lt;=2.7 that lack spectroscopic calibration. In the end, Euclid itself will deliver telluric-free NIR spectra that can complete the calibration.
description: A&amp;A language edited version