HOD-Dependent Systematics for Luminous Red Galaxies in the DESI 2024 BAO Analysis

Abstract

In this paper, we present the estimation of systematics related to the halo occupation distribution (HOD) modeling in the baryon acoustic oscillations (BAO) distance measurement of the Dark Energy Spectroscopic Instrument (DESI) 2024 analysis. This paper focuses on the study of HOD systematics for luminous red galaxies (LRG). We consider three different HOD models for LRGs, including the base 5-parameter vanilla model and two extensions to it, that we refer to as baseline and extended models. The baseline model is described by the 5 vanilla HOD parameters, an incompleteness factor and a velocity bias parameter, whereas the extended one also includes a galaxy assembly bias and a satellite profile parameter. We utilize the 25 dark matter simulations available in the AbacusSummit simulation suite at $z=$ 0.8 and generate mock catalogs for our different HOD models. To test the impact of the HOD modeling in the position of the BAO peak, we run BAO fits for all these sets of simulations and compare the best-fit BAO-scaling parameters ${\alpha }_{\mathrm{iso}}$ and ${\alpha }_{\mathrm{AP}}$ between every pair of HOD models. We do this for both Fourier and configuration spaces independently, using post-reconstruction measurements. We find a 3.3$\sigma$ detection of HOD systematic for ${\alpha }_{\mathrm{AP}}$ in configuration space with an amplitude of 0.19%. For the other cases, we did not find a 3$\sigma$ detection, and we decided to compute a conservative estimation of the systematic using the ensemble of shifts between all pairs of HOD models. By doing this, we quote a systematic with an amplitude of 0.07% in ${\alpha }_{\mathrm{iso}}$ for both Fourier and configuration spaces; and of 0.09% in ${\alpha }_{\mathrm{AP}}$ for Fourier space.

36 pages, 9 figures. Supporting publication of DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars

References in corpus (32)

• The Pantheon+ Analysis: Cosmological Constraints
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Galaxy Evolution from Halo Occupation Distribution Modeling of DEEP2 and SDSS Galaxy Clustering
• Improving Cosmological Distance Measurements by Reconstruction of the Baryon Acoustic Peak
• Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in Fourier-space
• 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
• Target Selection and Validation of DESI Luminous Red Galaxies
• AbacusSummit: A Massive Set of High-Accuracy, High-Resolution $N$-Body Simulations
• Target Selection and Validation of DESI Quasars
• Target Selection and Validation of DESI Emission Line Galaxies
• The $\text{Abacus}$ Cosmological $N$-body Code
• AbacusHOD: A highly efficient extended multi-tracer HOD framework and its application to BOSS and eBOSS data
• Reconstruction within the Zeldovich approximation
• \textsc{CompaSO}: A new halo finder for competitive assignment to spherical overdensities
• Baryon Acoustic Oscillation Theory and Modelling Systematics for the DESI 2024 results
• Estimating Covariance Matrices for Two- and Three-Point Correlation Function Moments in Arbitrary Survey Geometries
• Accurate predictions from small boxes: variance suppression via the Zel'dovich approximation
• Semi-analytical covariance matrices for two-point correlation function for DESI 2024 data
• Optimal Reconstruction of Baryon Acoustic Oscillations for DESI 2024
• Precision Redshift-Space Galaxy Power Spectra using Zel'dovich Control Variates
• Constructing high-fidelity halo merger trees in AbacusSummit
• Barry and the BAO Model Comparison
• The Completed SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: GLAM-QPM mock galaxy catalogs for the Emission Line Galaxy Sample
• HOD-Dependent Systematics in Emission Line Galaxies for the DESI 2024 BAO analysis
• Validation of semi-analytical, semi-empirical covariance matrices for two-point correlation function for Early DESI data
• Mitigating the noise of DESI mocks using analytic control variates
• Impact of tidal environment on galaxy clustering in GAMA

Cited by in corpus (9)

• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
• DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars
• DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars
• Semi-analytical covariance matrices for two-point correlation function for DESI 2024 data
• Optimal Reconstruction of Baryon Acoustic Oscillations for DESI 2024
• Fiducial-Cosmology-dependent systematics for the DESI 2024 BAO Analysis
• HOD-Dependent Systematics in Emission Line Galaxies for the DESI 2024 BAO analysis
• Exploring HOD-dependent systematics for the DESI 2024 Full-Shape galaxy clustering analysis