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  4. HOD-dependent systematics for luminous red galaxies in the DESI 2024 BAO analysis
 
research article

HOD-dependent systematics for luminous red galaxies in the DESI 2024 BAO analysis

Mena-Fernandez, J.
•
Garcia-Quintero, C.
•
Yuan, S.
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January 1, 2025
Journal Of Cosmology And Astroparticle Physics

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(iso) and alpha(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(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(iso) for both Fourier and configuration spaces; and of 0.09% in alpha(AP) for Fourier space.

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Type
research article
DOI
10.1088/1475-7516/2025/01/133
Web of Science ID

WOS:001419782300001

Author(s)
Mena-Fernandez, J.

Communaute Universite Grenoble Alpes

Garcia-Quintero, C.

University of Texas System

Yuan, S.

Stanford University

Hadzhiyska, B.

United States Department of Energy (DOE)

Alves, O.

University of Michigan System

Rashkovetskyi, M.

Harvard University

Seo, H.

University System of Ohio

Padmanabhan, N.

Yale University

Nadathur, S.

University of Portsmouth

Howlett, C.

University of Queensland

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Date Issued

2025-01-01

Publisher

IOP Publishing Ltd

Published in
Journal Of Cosmology And Astroparticle Physics
Issue

1

Article Number

133

Subjects

baryon acoustic oscillations

•

galaxy clustering

•

galaxy surveys

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
FunderFunding(s)Grant NumberGrant URL

United States Department of Energy (DOE)

DE-SC0019091;DE-SC0023241

United States Department of Energy (DOE)

United States Department of Energy (DOE)

DE-AC02-05CH1123

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Available on Infoscience
February 26, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/247229
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