J McCullough
DESI complete calibration of the colour–redshift relation (DC3R2): results from early DESI data
McCullough, J; Gruen, D; Amon, A; Roodman, A; Masters, D; Raichoor, A; Schlegel, D; Canning, R; Castander, F J; DeRose, J; Miquel, R; Myles, J; Newman, J A; Slosar, A; Speagle, J; Wilson, M J; Aguilar, J; Ahlen, S; Bailey, S; Brooks, D; Claybaugh, T; Cole, S; Dawson, K; de la Macorra, A; Doel, P; Forero-Romero, J E; Gontcho A Gontcho, S; Guy, J; Kehoe, R; Kremin, A; Landriau, M; Le Guillou, L; Levi, M; Manera, M; Martini, P; Meisner, A; Moustakas, J; Nie, J; Percival, W J; Poppett, C; Prada, F; Rezaie, M; Rossi, G; Sanchez, E; Seo, H; Tarlé, G; Weaver, B A; Zhou, Z; Zou, H; DESI Collaboration
Authors
D Gruen
A Amon
A Roodman
D Masters
A Raichoor
D Schlegel
R Canning
F J Castander
J DeRose
R Miquel
J Myles
J A Newman
A Slosar
J Speagle
M J Wilson
J Aguilar
S Ahlen
S Bailey
D Brooks
T Claybaugh
Professor Shaun Cole shaun.cole@durham.ac.uk
Professor
K Dawson
A de la Macorra
P Doel
J E Forero-Romero
S Gontcho A Gontcho
J Guy
R Kehoe
A Kremin
M Landriau
L Le Guillou
M Levi
M Manera
P Martini
A Meisner
J Moustakas
J Nie
W J Percival
C Poppett
F Prada
M Rezaie
G Rossi
E Sanchez
H Seo
G Tarlé
B A Weaver
Z Zhou
H Zou
DESI Collaboration
Abstract
We present initial results from the Dark Energy Spectroscopic Instrument (DESI) complete calibration of the colour–redshift relation (DC3R2) secondary target survey. Our analysis uses 230 k galaxies that overlap with KiDS-VIKING ugriZYJHKs photometry to calibrate the colour–redshift relation and to inform photometric redshift (photo-z) inference methods of future weak lensing surveys. Together with emission line galaxies (ELGs), luminous red galaxies (LRGs), and the Bright Galaxy Survey (BGS) that provide samples of complementary colour, the DC3R2 targets help DESI to span 56 per cent of the colour space visible to Euclid and LSST with high confidence spectroscopic redshifts. The effects of spectroscopic completeness and quality are explored, as well as systematic uncertainties introduced with the use of common Self-Organizing Maps trained on different photometry than the analysis sample. We further examine the dependence of redshift on magnitude at fixed colour, important for the use of bright galaxy spectra to calibrate redshifts in a fainter photometric galaxy sample. We find that noise in the KiDS-VIKING photometry introduces a dominant, apparent magnitude dependence of redshift at fixed colour, which indicates a need for carefully chosen deep drilling fields, and survey simulation to model this effect for future weak lensing surveys.
Citation
McCullough, J., Gruen, D., Amon, A., Roodman, A., Masters, D., Raichoor, A., …DESI Collaboration. (2024). DESI complete calibration of the colour–redshift relation (DC3R2): results from early DESI data. Monthly Notices of the Royal Astronomical Society, 531(2), 2582-2602. https://doi.org/10.1093/mnras/stae1316
Journal Article Type | Article |
---|---|
Acceptance Date | May 9, 2024 |
Online Publication Date | Jun 3, 2024 |
Publication Date | 2024-06 |
Deposit Date | Jul 4, 2024 |
Publicly Available Date | Jul 4, 2024 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 531 |
Issue | 2 |
Pages | 2582-2602 |
DOI | https://doi.org/10.1093/mnras/stae1316 |
Public URL | https://durham-repository.worktribe.com/output/2517105 |
Files
Published Journal Article
(4 Mb)
PDF
Licence
http://creativecommons.org/licenses/by/4.0/
Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/
Copyright Statement
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
You might also like
DESI Mg ii Absorbers: Extinction Characteristics and Quasar Redshift Accuracy
(2025)
Journal Article
Full-Shape analysis of the power spectrum and bispectrum of DESI DR1 LRG and QSO samples
(2025)
Journal Article
A sound horizon-free measurement of H₀ in DESI 2024
(2025)
Journal Article