Dark Energy Survey Year 3 Results: Galaxy Sample for BAO Measurement

Abstract

In this paper we present and validate the galaxy sample used for the analysis of the Baryon Acoustic Oscillation signal (BAO) in the Dark Energy Survey (DES) Y3 data. The definition is based on a colour and redshift-dependent magnitude cut optimized to select galaxies at redshifts higher than 0.5, while ensuring a high quality photometric redshift determination. The sample covers $\approx 4100$ square degrees to a depth of $i=22.3(AB)$ at $10\sigma$. It contains 7,031,993 galaxies in the redshift range from $z$= 0.6 to 1.1, with a mean effective redshift of 0.835. Photometric redshifts are estimated with the machine learning algorithm DNF, and are validated using the VIPERS PDR2 sample. We find a mean redshift bias of $z_{\mathrm{bias}}\approx 0.01$ and a mean uncertainty, in units of $1+z$, of ${\sigma }_{68}\approx 0.03$. We evaluate the galaxy population of the sample, showing it is mostly built upon Elliptical to Sbc types. Furthermore, we find a low level of stellar contamination of $\lesssim 4\%$. We present the method used to mitigate the effect of spurious clustering coming from observing conditions and other large-scale systematics. We apply it to the DES Y3 BAO sample and calculate sample weights that are used to get a robust estimate of the galaxy clustering signal. This paper is one of a series dedicated to the analysis of the BAO signal in the DES Y3 data. In the companion papers, Ferrero et al. (2021) and DES Collaboration (2021), we present the galaxy mock catalogues used to calibrate the analysis and the angular diameter distance constraints obtained through the fitting to the BAO scale, respectively. The galaxy sample, masks and additional material will be released in the public DES data repository upon acceptance.

arXiv commentAccepted for publication in MNRAS. 24 pages, 24 figures

References in corpus (57)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
• The 6dF Galaxy Survey: Baryon Acoustic Oscillations and the Local Hubble Constant
• The 2dF Galaxy Redshift Survey: Power-spectrum analysis of the final dataset and cosmological implications
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 10 and 11 galaxy samples
• Baryon Acoustic Oscillations in the Sloan Digital Sky Survey Data Release 7 Galaxy Sample
• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Bayesian photometric redshift estimation
• SparsePak: A Formatted Fiber Field Unit for The WIYN Telescope Bench Spectrograph. I. Design, Construction, and Calibration
• The COSMOS2015 Catalog: Exploring the 1<z<6 Universe with half a million galaxies
• The Dark Energy Camera
• Spectroscopic Target Selection for the Sloan Digital Sky Survey: The Luminous Red Galaxy Sample
• The Dark Energy Survey: more than dark energy - an overview
• Measuring the Baryon Acoustic Oscillation scale using the SDSS and 2dFGRS
• Clustering of Luminous Red Galaxies IV: Baryon Acoustic Peak in the Line-of-Sight Direction and a Direct Measurement of H(z)
• Measurement of BAO correlations at $z=2.3$ with SDSS DR12 \lya-Forests
• The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR14 quasar sample: First measurement of Baryon Acoustic Oscillations between redshift 0.8 and 2.2
• The Clustering of Luminous Red Galaxies in the Sloan Digital Sky Survey Imaging Data
• The VIMOS Public Extragalactic Redshift Survey (VIPERS). An unprecedented view of galaxies and large-scale structure at 0.5<z<1.2
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Observational systematics and baryon acoustic oscillations in the correlation function
• The WiggleZ Dark Energy Survey: testing the cosmological model with baryon acoustic oscillations at z=0.6
• The Dark Energy Survey Image Processing Pipeline
• The VIMOS Public Extragalactic Redshift Survey (VIPERS). Full spectroscopic data and auxiliary information release (PDR-2)
• The MICE Grand Challenge Lightcone Simulation I: Dark matter clustering
• Dark Energy Survey Year 3 Results: Photometric Data Set for Cosmology
• redMaGiC: Selecting Luminous Red Galaxies from the DES Science Verification Data
• Estimating the Redshift Distribution of Faint Galaxy Samples
• Ameliorating Systematic Uncertainties in the Angular Clustering of Galaxies: A Study using SDSS-III
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Large-scale Structure Catalogs for Cosmological Analysis
• Dark Energy Survey Year 1 Results: Measurement of the Baryon Acoustic Oscillation scale in the distribution of galaxies to redshift 1
• Methods for Rapidly Processing Angular Masks of Next-Generation Galaxy Surveys
• The MICE Grand Challenge Lightcone Simulation II: Halo and Galaxy catalogues
• Improving lognormal models for cosmological fields
• Dark Energy Survey Year 1 Results: Galaxy clustering for combined probes
• A 2% Distance to z=0.35 by Reconstructing Baryon Acoustic Oscillations - II: Fitting Techniques
• DNF - Galaxy photometric redshift by Directional Neighbourhood Fitting
• Clustering of quasars in SDSS-IV eBOSS : study of potential systematics and bias determination
• Acoustic scale from the angular power spectra of SDSS-III DR8 photometric luminous galaxies
• Forward Global Photometric Calibration of the Dark Energy Survey
• The Correlation Function of Optically Selected Galaxy Clusters in the Sloan Digital Sky Survey
• OzDES multi-object fibre spectroscopy for the Dark Energy Survey: Results and second data release
• Preliminary Target Selection for the DESI Luminous Red Galaxy (LRG) Sample
• Dark Energy Survey Year 3 Results: Optimizing the Lens Sample in Combined Galaxy Clustering and Galaxy-Galaxy Lensing Analysis
• Power spectrum of the maxBCG sample: detection of acoustic oscillations using galaxy clusters
• Clustering of Photometric Luminous Red Galaxies II: Cosmological Implications from the Baryon Acoustic Scale
• Improving Galaxy Clustering Measurements with Deep Learning: analysis of the DECaLS DR7 data
• Mitigating contamination in LSS surveys: a comparison of methods
• Clustering of photometric luminous red galaxies I : Growth of Structure and Baryon Acoustic Feature
• Imaging Systematics and Clustering of DESI Main Targets
• Star-galaxy classification in the Dark Energy Survey Y1 dataset
• Dark Energy Survey Year 1 Results: Galaxy Sample for BAO Measurement
• Assessment of Systematic Chromatic Errors that Impact Sub-1% Photometric Precision in Large-Area Sky Surveys
• DES Science Portal: Computing Photometric Redshifts
• Luminous red galaxies in the Kilo Degree Survey: selection with broad-band photometry and weak lensing measurements
• Linear Systematics Mitigation in Galaxy Clustering in the Dark Energy Survey Year 1 Data