Combined tracer analysis for DESI 2024 BAO

This paper demonstrates how the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1) and future baryon acoustic oscillations (BAO) analyses can optimally combine overlapping tracers (galaxies of distinct types) in the same redshift range. We make a unified catalog of Luminous Red Galaxie...

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Detalles Bibliográficos
Autores: Valcin, David|||0000-0003-0129-0620, Rashkovetskyi, Michael, Seo, Hee-Jong, Beutler, Florian|||0000-0003-0467-5438, McDonald, Patrick|||0000-0001-8346-8394, de Mattia, Arnaud, Rosado Marín, Alberto José|||0000-0001-7545-3504, Ross, Ashley J., Padmanabhan, Nikhil, Aguilar, Jessica Nicole, Ahlen, Steven, Andrade, Uendert|||0000-0002-4118-8236, Bianchi, Davide, Pérez Ràfols, Ignasi|||0000-0001-6979-0125
Tipo de recurso: artículo
Fecha de publicación:2026
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:dnet:upcommonspor::53235396210193ac2aa16602fa539660
Acceso en línea:https://hdl.handle.net/2117/461973
https://dx.doi.org/10.1088/1475-7516/2026/04/058
Access Level:acceso abierto
Palabra clave:Baryon acoustic oscillations
Cosmological simulations
Galaxy clustering
Redshift surveys
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
Descripción
Sumario:This paper demonstrates how the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1) and future baryon acoustic oscillations (BAO) analyses can optimally combine overlapping tracers (galaxies of distinct types) in the same redshift range. We make a unified catalog of Luminous Red Galaxies (LRGs) and Emission Line Galaxies (ELGs) in the redshift range 0.8 < z < 1.1 and investigate the impact on the BAO constraints. DESI DR1 contains ~ 30% of the final DESI LRG sample and less than 25% of the final ELG sample, and the combination of LRGs and ELGs increases the number density and reduces the shot noise. We developed a pipeline to merge the overlapping tracers using galaxy bias as an approximately optimal weight and tested the pipeline on a suite of Abacus simulations, calibrated on the final version of the DESI Early Data Release. When applying our pipeline to the DESI DR1 catalog, we find an improvement in the BAO constraints of 11% for aiso and ~ 7.0% for aAP consistent with our findings in mock catalogs. Our analysis was integrated into the DESI DR1 BAO analysis to produce theLRG+ELG result in the 0.8 < z < 1.1 redshift bin, which provided the most precise BAO measurement from DESI DR1 with a 0.86% constraint on the BAO distance scale and a 9.1s detection of the isotropic BAO feature.

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