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.

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 (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 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.

Euclid preparation: XX. The Complete Calibration of the Color-Redshift Relation survey: LBT observations and data release / R. Saglia; S. De Nicola; M. Fabricius; V. Guglielmo; J. Snigula; R. Zöller; R. Bender; J. Heidt; D. Masters; D. Stern; S. Paltani; A. Amara; N. Auricchio; M. Baldi; C. Bodendorf; D. Bonino; E. Branchini; M. Brescia; J. Brinchmann; S. Camera; V. Capobianco; C. Carbone; J. Carretero; M. Castellano; S. Cavuoti; R. Cledassou; G. Congedo; C. J. Conselice; L. Conversi; Y. Copin; L. Corcione; F. Courbin; M. Cropper; A. Da Silva; H. Degaudenzi; M. Douspis; F. Dubath; C. A. J. Duncan; X. Dupac; S. Dusini; S. Farrens; M. Frailis; E. Franceschi; S. Galeotta; B. Garilli; W. Gillard; B. Gillis; C. Giocoli; A. Grazian; F. Grupp; S. V. H. Haugan; H. Hoekstra; W. Holmes; F. Hormuth; A. Hornstrup; K. Jahnke; M. Kümmel; S. Kermiche; A. Kiessling; M. Kunz; H. Kurki-Suonio; R. Laureijs; S. Ligori; P. B. Lilje; I. Lloro; E. Maiorano; O. Marggraf; K. Markovic; F. Marulli; R. Massey; H. J. McCracken; M. Melchior; G. Meylan; M. Moresco; L. Moscardini; E. Munari; S. M. Niemi; C. Padilla; F. Pasian; K. Pedersen; W. J. Percival; V. Pettorino; S. Pires; M. Poncet; L. Popa; L. Pozzetti; F. Raison; A. Renzi; J. Rhodes; G. Riccio; E. Romelli; E. Rossetti; D. Sapone; B. Sartoris; P. Schneider; A. Secroun; G. Seidel; C. Sirignano; G. Sirri; L. Stanco; P. Tallada-Crespí; D. Tavagnacco; A. N. Taylor; I. Tereno; R. Toledo-Moreo; F. Torradeflot; I. Tutusaus; E. A. Valentijn; L. Valenziano; T. Vassallo; Y. Wang; A. Zacchei; G. Zamorani; J. Zoubian; S. Andreon; S. Bardelli; J. Graciá-Carpio; D. Maino; N. Mauri; A. Tramacere; E. Zucca; A. Alvarez Ayllon; H. Aussel; C. Baccigalupi; A. Balaguera-Antolínez; M. Ballardini; A. Biviano; M. Bolzonella; E. Bozzo; C. Burigana; R. Cabanac; A. Cappi; C. S. Carvalho; S. Casas; G. Castignani; A. Cooray; J. Coupon; H. M. Courtois; S. Davini; G. Desprez; H. Dole; J. A. Escartin; S. Escoffier; M. Farina; S. Fotopoulou; K. Ganga; J. Garcia-Bellido; K. George; F. Giacomini; G. Gozaliasl; H. Hildebrandt; I. Hook; O. Ilbert; V. Kansal; A. Kashlinsky; E. Keihanen; C. C. Kirkpatrick; A. Loureiro; J. Macías-Pérez; M. Magliocchetti; G. Mainetti; R. Maoli; M. Martinelli; N. Martinet; R. B. Metcalf; G. Morgante; S. Nadathur; A. A. Nucita; L. Patrizii; V. Popa; C. Porciani; D. Potter; A. Pourtsidou; P. Reimberg; A. G. Sánchez; Z. Sakr; M. Schirmer; E. Sefusatti; M. Sereno; J. Stadel; R. Teyssier; C. Valieri; J. Valiviita; A. Veropalumbo; M. Viel. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - STAMPA. - 664:(2022), pp. A196.1-A196.22. [10.1051/0004-6361/202243604]

Euclid preparation: XX. The Complete Calibration of the Color-Redshift Relation survey: LBT observations and data release

M. Baldi;F. Marulli;M. Moresco;L. Moscardini;E. Rossetti;N. Mauri;R. B. Metcalf;
2022

Abstract

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 (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 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.
2022
Euclid preparation: XX. The Complete Calibration of the Color-Redshift Relation survey: LBT observations and data release / R. Saglia; S. De Nicola; M. Fabricius; V. Guglielmo; J. Snigula; R. Zöller; R. Bender; J. Heidt; D. Masters; D. Stern; S. Paltani; A. Amara; N. Auricchio; M. Baldi; C. Bodendorf; D. Bonino; E. Branchini; M. Brescia; J. Brinchmann; S. Camera; V. Capobianco; C. Carbone; J. Carretero; M. Castellano; S. Cavuoti; R. Cledassou; G. Congedo; C. J. Conselice; L. Conversi; Y. Copin; L. Corcione; F. Courbin; M. Cropper; A. Da Silva; H. Degaudenzi; M. Douspis; F. Dubath; C. A. J. Duncan; X. Dupac; S. Dusini; S. Farrens; M. Frailis; E. Franceschi; S. Galeotta; B. Garilli; W. Gillard; B. Gillis; C. Giocoli; A. Grazian; F. Grupp; S. V. H. Haugan; H. Hoekstra; W. Holmes; F. Hormuth; A. Hornstrup; K. Jahnke; M. Kümmel; S. Kermiche; A. Kiessling; M. Kunz; H. Kurki-Suonio; R. Laureijs; S. Ligori; P. B. Lilje; I. Lloro; E. Maiorano; O. Marggraf; K. Markovic; F. Marulli; R. Massey; H. J. McCracken; M. Melchior; G. Meylan; M. Moresco; L. Moscardini; E. Munari; S. M. Niemi; C. Padilla; F. Pasian; K. Pedersen; W. J. Percival; V. Pettorino; S. Pires; M. Poncet; L. Popa; L. Pozzetti; F. Raison; A. Renzi; J. Rhodes; G. Riccio; E. Romelli; E. Rossetti; D. Sapone; B. Sartoris; P. Schneider; A. Secroun; G. Seidel; C. Sirignano; G. Sirri; L. Stanco; P. Tallada-Crespí; D. Tavagnacco; A. N. Taylor; I. Tereno; R. Toledo-Moreo; F. Torradeflot; I. Tutusaus; E. A. Valentijn; L. Valenziano; T. Vassallo; Y. Wang; A. Zacchei; G. Zamorani; J. Zoubian; S. Andreon; S. Bardelli; J. Graciá-Carpio; D. Maino; N. Mauri; A. Tramacere; E. Zucca; A. Alvarez Ayllon; H. Aussel; C. Baccigalupi; A. Balaguera-Antolínez; M. Ballardini; A. Biviano; M. Bolzonella; E. Bozzo; C. Burigana; R. Cabanac; A. Cappi; C. S. Carvalho; S. Casas; G. Castignani; A. Cooray; J. Coupon; H. M. Courtois; S. Davini; G. Desprez; H. Dole; J. A. Escartin; S. Escoffier; M. Farina; S. Fotopoulou; K. Ganga; J. Garcia-Bellido; K. George; F. Giacomini; G. Gozaliasl; H. Hildebrandt; I. Hook; O. Ilbert; V. Kansal; A. Kashlinsky; E. Keihanen; C. C. Kirkpatrick; A. Loureiro; J. Macías-Pérez; M. Magliocchetti; G. Mainetti; R. Maoli; M. Martinelli; N. Martinet; R. B. Metcalf; G. Morgante; S. Nadathur; A. A. Nucita; L. Patrizii; V. Popa; C. Porciani; D. Potter; A. Pourtsidou; P. Reimberg; A. G. Sánchez; Z. Sakr; M. Schirmer; E. Sefusatti; M. Sereno; J. Stadel; R. Teyssier; C. Valieri; J. Valiviita; A. Veropalumbo; M. Viel. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - STAMPA. - 664:(2022), pp. A196.1-A196.22. [10.1051/0004-6361/202243604]
R. Saglia; S. De Nicola; M. Fabricius; V. Guglielmo; J. Snigula; R. Zöller; R. Bender; J. Heidt; D. Masters; D. Stern; S. Paltani; A. Amara; N. Auricchio; M. Baldi; C. Bodendorf; D. Bonino; E. Branchini; M. Brescia; J. Brinchmann; S. Camera; V. Capobianco; C. Carbone; J. Carretero; M. Castellano; S. Cavuoti; R. Cledassou; G. Congedo; C. J. Conselice; L. Conversi; Y. Copin; L. Corcione; F. Courbin; M. Cropper; A. Da Silva; H. Degaudenzi; M. Douspis; F. Dubath; C. A. J. Duncan; X. Dupac; S. Dusini; S. Farrens; M. Frailis; E. Franceschi; S. Galeotta; B. Garilli; W. Gillard; B. Gillis; C. Giocoli; A. Grazian; F. Grupp; S. V. H. Haugan; H. Hoekstra; W. Holmes; F. Hormuth; A. Hornstrup; K. Jahnke; M. Kümmel; S. Kermiche; A. Kiessling; M. Kunz; H. Kurki-Suonio; R. Laureijs; S. Ligori; P. B. Lilje; I. Lloro; E. Maiorano; O. Marggraf; K. Markovic; F. Marulli; R. Massey; H. J. McCracken; M. Melchior; G. Meylan; M. Moresco; L. Moscardini; E. Munari; S. M. Niemi; C. Padilla; F. Pasian; K. Pedersen; W. J. Percival; V. Pettorino; S. Pires; M. Poncet; L. Popa; L. Pozzetti; F. Raison; A. Renzi; J. Rhodes; G. Riccio; E. Romelli; E. Rossetti; D. Sapone; B. Sartoris; P. Schneider; A. Secroun; G. Seidel; C. Sirignano; G. Sirri; L. Stanco; P. Tallada-Crespí; D. Tavagnacco; A. N. Taylor; I. Tereno; R. Toledo-Moreo; F. Torradeflot; I. Tutusaus; E. A. Valentijn; L. Valenziano; T. Vassallo; Y. Wang; A. Zacchei; G. Zamorani; J. Zoubian; S. Andreon; S. Bardelli; J. Graciá-Carpio; D. Maino; N. Mauri; A. Tramacere; E. Zucca; A. Alvarez Ayllon; H. Aussel; C. Baccigalupi; A. Balaguera-Antolínez; M. Ballardini; A. Biviano; M. Bolzonella; E. Bozzo; C. Burigana; R. Cabanac; A. Cappi; C. S. Carvalho; S. Casas; G. Castignani; A. Cooray; J. Coupon; H. M. Courtois; S. Davini; G. Desprez; H. Dole; J. A. Escartin; S. Escoffier; M. Farina; S. Fotopoulou; K. Ganga; J. Garcia-Bellido; K. George; F. Giacomini; G. Gozaliasl; H. Hildebrandt; I. Hook; O. Ilbert; V. Kansal; A. Kashlinsky; E. Keihanen; C. C. Kirkpatrick; A. Loureiro; J. Macías-Pérez; M. Magliocchetti; G. Mainetti; R. Maoli; M. Martinelli; N. Martinet; R. B. Metcalf; G. Morgante; S. Nadathur; A. A. Nucita; L. Patrizii; V. Popa; C. Porciani; D. Potter; A. Pourtsidou; P. Reimberg; A. G. Sánchez; Z. Sakr; M. Schirmer; E. Sefusatti; M. Sereno; J. Stadel; R. Teyssier; C. Valieri; J. Valiviita; A. Veropalumbo; M. Viel
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