DESI Complete Calibration of the Color-Redshift Relation (DC3R2): Results from early DESI data

Abstract

We present initial results from the Dark Energy Spectroscopic Instrument (DESI) Complete Calibration of the Color-Redshift Relation (DC3R2) secondary target survey. Our analysis uses 230k galaxies that overlap with KiDS-VIKING $ugriZYJH{K}_s$ photometry to calibrate the color-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 color, the DC3R2 targets help DESI to span 56% of the color 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 color, 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 color, which indicates a need for carefully chosen deep drilling fields, and survey simulation to model this effect for future weak lensing surveys.

19 pages, 16 figures, published in MNRAS, interactive visualizations at https://jmccull.github.io/DC3R2_Overview

References in corpus (28)

• EAZY: A Fast, Public Photometric Redshift Code
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• zCOSMOS: A Large VLT/VIMOS redshift survey covering 0 < z < 3 in the COSMOS field
• Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument
• Dark Energy Survey Year 3 Results: Cosmology from Cosmic Shear and Robustness to Data Calibration
• The MOSFIRE Deep Evolution Field (MOSDEF) Survey: Rest-Frame Optical Spectroscopy for ~1500 H-Selected Galaxies at 1.37 < z < 3.8
• Third Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• The VIMOS Ultra-Deep Survey: ~10,000 galaxies with spectroscopic redshifts to study galaxy assembly at early epochs 2<z<~6
• The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees
• The Spectroscopic Data Processing Pipeline for the Dark Energy Spectroscopic Instrument
• Target Selection and Validation of DESI Luminous Red Galaxies
• The DESI Experiment Part II: Instrument Design
• Target Selection and Validation of DESI Emission Line Galaxies
• Dark Energy Survey Year 3 Results: Redshift Calibration of the Weak Lensing Source Galaxies
• The Target-selection Pipeline for the Dark Energy Spectroscopic Instrument
• The Complete Calibration of the Color-Redshift Relation (C3R2) Survey: Analysis and Data Release 2
• Magellan Spectroscopy of AGN Candidates in the COSMOS Field
• The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) Survey Design, Reductions, and Detections
• Photometric Redshifts for Next-Generation Surveys
• Dark Energy Survey Year 3 Results: Measuring the Survey Transfer Function with Balrog
• Inferring More from Less: Prospector as a Photometric Redshift Engine in the Era of JWST
• KiDS+VIKING-450: Improved cosmological parameter constraints from redshift calibration with self-organising maps
• KiDS-1000: cosmic shear with enhanced redshift calibration
• The GEEC2 spectroscopic survey of Galaxy Groups at $0.8<z<1$
• Weak Lensing Tomographic Redshift Distribution Inference for the Hyper Suprime-Cam Subaru Strategic Program three-year shape catalogue
• KiDS-Legacy calibration: unifying shear and redshift calibration with the SKiLLS multi-band image simulations
• Forward modeling of galaxy populations for cosmological redshift distribution inference
• Euclid preparation: XX. The Complete Calibration of the Color-Redshift Relation survey: LBT observations and data release

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• Enhancing Photometric Redshift Catalogs Through Color-Space Analysis: Application to KiDS-Bright Galaxies
• The Compilation and Validation of the Spectroscopic Redshift Catalogs for the DESI-COSMOS and DESI-XMMLSS Fields
• pop-cosmos: Insights from generative modeling of a deep, infrared-selected galaxy population
• GalSBI-SPS: a stellar population synthesis-based galaxy population model for cosmology and galaxy evolution applications
• Euclid preparation. 3D reconstruction of the cosmic web with simulated Euclid Deep spectroscopic samples