ELG Spectroscopic Systematics Analysis of the DESI Data Release 1

Abstract

Dark Energy Spectroscopic Instrument (DESI) uses more than 2.4 million Emission Line Galaxies (ELGs) for 3D large-scale structure (LSS) analyses in its Data Release 1 (DR1). Such large statistics enable thorough research on systematic uncertainties. In this study, we focus on spectroscopic systematics of ELGs. The redshift success rate ($f_{\mathrm{goodz}}$) is the relative fraction of secure redshifts among all measurements. It depends on observing conditions, thus introduces non-cosmological variations to the LSS. We, therefore, develop the redshift failure weight ($w_{\mathrm{zfail}}$) and a per-fibre correction (${\eta }_{\mathrm{zfail}}$) to mitigate these dependences. They have minor influences on the galaxy clustering. For ELGs with a secure redshift, there are two subtypes of systematics: 1) catastrophics (large) that only occur in a few samples; 2) redshift uncertainty (small) that exists for all samples. The catastrophics represent 0.26\% of the total DR1 ELGs, composed of the confusion between O\,\textsc{ii} and sky residuals, double objects, total catastrophics and others. We simulate the realistic 0.26\% catastrophics of DR1 ELGs, the hypothetical 1\% catastrophics, and the truncation of the contaminated $1.31<z<1.33$ in the \textsc{AbacusSummit} ELG mocks. Their $P_{\ell }$ show non-negligible bias from the uncontaminated mocks. But their influences on the redshift space distortions (RSD) parameters are smaller than $0.2\sigma$. The redshift uncertainty of \Yone ELGs is 8.5 km/s with a Lorentzian profile. The code for implementing the catastrophics and redshift uncertainty on mocks can be found in https://github.com/Jiaxi-Yu/modelling_spectro_sys.

References in corpus (51)

• Efficient Computation of CMB anisotropies in closed FRW models
• The 2dF Galaxy Redshift Survey: Spectra and redshifts
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• Baryonic Features in the Matter Transfer Function
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• The Baryon Oscillation Spectroscopic Survey of SDSS-III
• Overview of the DESI Legacy Imaging Surveys
• Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• The Dark Energy Camera
• Power Spectrum Analysis of Three-Dimensional Redshift Surveys
• The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data
• Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument
• The DESI Experiment, a whitepaper for Snowmass 2013
• The Early Data Release of the Dark Energy Spectroscopic Instrument
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Analysis of potential systematics
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Observational systematics and baryon acoustic oscillations in the correlation function
• DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars
• DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation
• DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman Alpha Forest
• 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
• AbacusSummit: A Massive Set of High-Accuracy, High-Resolution $N$-Body Simulations
• Project Overview of the Beijing-Arizona Sky Survey
• Target Selection and Validation of DESI Quasars
• Corrfunc --- A Suite of Blazing Fast Correlation Functions on the CPU
• A Measurement of the Quadrupole Power Spectrum in the Clustering of the 2dF QSO Survey
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Large-scale Structure Catalogs for Cosmological Analysis
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the BAO and growth rate of structure of the emission line galaxy sample from the anisotropic power spectrum between redshift 0.6 and 1.1
• Target Selection and Validation of DESI Emission Line Galaxies
• The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations at redshift of 0.72 with the DR14 Luminous Red Galaxy Sample
• The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR14 quasar sample: measurement of the growth rate of structure from the anisotropic correlation function between redshift 0.8 and 2.2
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Growth rate of structure measurement from anisotropic clustering analysis in configuration space between redshift 0.6 and 1.1 for the Emission Line Galaxy sample
• The Target-selection Pipeline for the Dark Energy Spectroscopic Instrument
• The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Large-scale Structure Catalogues and Measurement of the isotropic BAO between redshift 0.6 and 1.1 for the Emission Line Galaxy Sample
• Galaxy Power Spectrum Multipoles Covariance in Perturbation Theory
• The WiggleZ Dark Energy Survey: the selection function and z=0.6 galaxy power spectrum
• An optimal FFT-based anisotropic power spectrum estimator
• The DESI Survey Validation: Results from Visual Inspection of the Quasar Survey Spectra
• ShapeFit: extracting the power spectrum shape information in galaxy surveys beyond BAO and RSD
• Performance of the Quasar Spectral Templates for the Dark Energy Spectroscopic Instrument
• Corrfunc: Blazing fast correlation functions with AVX512F SIMD Intrinsics
• Mitigation of DESI fiber assignment incompleteness effect on two-point clustering with small angular scale truncated estimators
• Semi-analytical covariance matrices for two-point correlation function for DESI 2024 data
• Construct the emission line galaxy-host halo connection through auto and cross correlations
• A comparison between Shapefit compression and Full-Modelling method with PyBird for DESI 2024 and beyond
• Validation of semi-analytical, semi-empirical covariance matrices for two-point correlation function for Early DESI data
• Validating the Galaxy and Quasar Catalog-Level Blinding Scheme for the DESI 2024 analysis

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• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars
• DESI 2024 VII: Cosmological Constraints from the Full-Shape Modeling of Clustering Measurements
• DESI 2024 II: Sample Definitions, Characteristics, and Two-point Clustering Statistics
• DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars
• Fiducial-Cosmology-dependent systematics for the DESI 2024 BAO Analysis
• Measuring ${\sigma }_8$ using DESI Legacy Imaging Surveys Emission-Line Galaxies and Planck CMB Lensing and the Impact of Dust on Parameter Inference
• Doppler bias: impact of peculiar velocities on color selection and the large scale structure of galaxy surveys
• 6x2pt: Forecasting gains from joint weak lensing and galaxy clustering analyses with spectroscopic-photometric galaxy cross-correlations
• The Impact of Spectroscopic Redshift Errors on Cosmological Measurements
• The Lyman-$\alpha$ Forest from LBGs: First 3D Correlation Measurement with DESI and Prospects for Cosmology