Saglia, R;
De Nicola, S;
Fabricius, M;
Guglielmo, V;
Snigula, J;
Zöller, R;
Bender, R;
... Viel, M; + view all
(2022)
Euclid preparation:
XX. The Complete Calibration of the Color–Redshift Relation survey: LBT observations and data release.
Astronomy & Astrophysics
, 664
, Article A196. 10.1051/0004-6361/202243604.
Preview |
PDF
Loureiro_Euclid Preparation_VoR.pdf - Published Version Download (23MB) | Preview |
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 (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.
| Type: | Article |
|---|---|
| Title: | Euclid preparation: XX. The Complete Calibration of the Color–Redshift Relation survey: LBT observations and data release |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/202243604 |
| Publisher version: | https://doi.org/10.1051/0004-6361/202243604 |
| Language: | English |
| Additional information: | © Euclid Collaboration et al. 2022. 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. |
| Keywords: | galaxies: distances and redshifts / catalogs / surveys |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10156317 |
Archive Staff Only
 |
View Item |
