Studying baryon acoustic oscillations using photometric redshifts from the DESI Legacy Imaging survey DR9

Context. The Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Survey DR9 (DR9 hereafter), with its extensive dataset of galaxy locations and photometric redshifts, presents an opportunity to study baryon acoustic oscillations (BAOs) in the region covered by the ongoing spectroscopic survey with DESI. Aims. We aim to investigate differences between different parts of the DR9 footprint. Furthermore, we want to measure the BAO scale for luminous red galaxies within them. Our selected redshift range of 0.6–0.8 corresponds to the bin in which a tension between DESI Y1 and eBOSS was found. Methods. We calculated the anisotropic two-point correlation function in a modified binning scheme to detect the BAOs in DR9 data. We then used template fits based on simulations to measure the BAO scale in the imaging data. Results. Our analysis reveals the expected correlation function shape in most of the footprint areas, showing a BAO scale consistent with Planck ’s observations. Aside from identified mask-related data issues in the southern region of the South Galactic Cap, we find a notable variance between the different footprints. Conclusions. We find that this variance is consistent with the difference between the DESI Y1 and eBOSS data, and it supports the argument that that tension is caused by sample variance. Additionally, we also uncovered systematic biases not previously accounted for in photometric BAO studies. We emphasize the necessity of adjusting for the systematic shift in the BAO scale associated with typical photometric redshift uncertainties to ensure accurate measurements.

Authors

Institutions

Publication Details

Journal
Astronomy and Astrophysics
Published
2025-02-07
DOI
https://doi.org/10.1051/0004-6361/202452007
Citations
1
Primary Topic
Galaxies: Formation, Evolution, Phenomena
Type
article
Field-Weighted Citation Impact
1.15

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

Studying baryon acoustic oscillations using photometric redshifts from the DESI Legacy Imaging survey DR9

D. Kirkby, Andrew Lambert, Yi Zheng, Rongpu Zhou et al.
1 citations
Astronomy and Astrophysics
Galaxies: Formation, Evolution, Phenomena
1.15
article

Studying baryon acoustic oscillations using photometric redshifts from the DESI Legacy Imaging survey DR9

D. Kirkby, Andrew Lambert, Yi Zheng, Rongpu Zhou, A. Muñoz-Gutiérrez, S. Juneau, Eva-Maria Mueller, Jeffrey A. Newman, Gregory Tarlé, Robert Blum, F. Valdés, Laurent Le Guillou, David Sprayberry, Gustavo Niz, Axel de la Macorra, Martin Landriau, Gaston Gutierrez, J. Aguilar, Eusebio Sanchez, Satya Gontcho A Gontcho, Chia-Hsun Chuang, Ashley J. Ross, ENRIQUE GAZTAÑAGA, Minji Oh, Joseph Harry Silber, Steven P. Ahlen, Aaron Meisner, Theodore S. Kisner, Biprateep Dey, David H. Brooks, Mehdi Rezaie, Z. Ding, Hu Zou, Michael Schubnell, Christoph Saulder, Benjamin A. Weaver, P. Doel, J. E. Forero-Romero, Michael Levi, Yong‐Seon Song, T. Claybaugh, Graziano Rossi, Francisco Prada
article en
1 citations

Abstract

Context. The Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Survey DR9 (DR9 hereafter), with its extensive dataset of galaxy locations and photometric redshifts, presents an opportunity to study baryon acoustic oscillations (BAOs) in the region covered by the ongoing spectroscopic survey with DESI. Aims. We aim to investigate differences between different parts of the DR9 footprint. Furthermore, we want to measure the BAO scale for luminous red galaxies within them. Our selected redshift range of 0.6–0.8 corresponds to the bin in which a tension between DESI Y1 and eBOSS was found. Methods. We calculated the anisotropic two-point correlation function in a modified binning scheme to detect the BAOs in DR9 data. We then used template fits based on simulations to measure the BAO scale in the imaging data. Results. Our analysis reveals the expected correlation function shape in most of the footprint areas, showing a BAO scale consistent with Planck ’s observations. Aside from identified mask-related data issues in the southern region of the South Galactic Cap, we find a notable variance between the different footprints. Conclusions. We find that this variance is consistent with the difference between the DESI Y1 and eBOSS data, and it supports the argument that that tension is caused by sample variance. Additionally, we also uncovered systematic biases not previously accounted for in photometric BAO studies. We emphasize the necessity of adjusting for the systematic shift in the BAO scale associated with typical photometric redshift uncertainties to ensure accurate measurements.

Astronomy and AstrophysicsVol. 695
Boston University (US), Chonnam National University (KR), Universidad Complutense de Madrid (ES), Centre National de la Recherche Scientifique (FR), Universidad de Guanajuato (MX), Fermi National Accelerator Laboratory (US), Institute of Space Sciences (ES), Hiroshima Shudo University (JP), High Energy Accelerator Research Organization (JP), Lawrence Berkeley National Laboratory (US), Chosun University (KR), Sun Yat-sen University (CN), Universidad de Los Andes (CO), University of Sussex (GB), University of Pittsburgh (US), Shanghai Jiao Tong University (CN), Kansas State University (US), University of California, Irvine (US), University of Michigan (US), Shanghai Astronomical Observatory (CN), Korea Astronomy and Space Science Institute (KR), The Ohio State University at Lima (US), Sejong University (KR), Sussex County Community College (US), Sorbonne Université (FR), National Solar Observatory (US), Max Planck Institute for Extraterrestrial Physics (DE), Institut d'Estudis Espacials de Catalunya (ES), Chonnam National University Hospital (KR), Kavli Institute for Particle Astrophysics and Cosmology (US), Stuttgart Observatory (DE), Korean Association for the Study of Intestinal Diseases (KR), Menlo School (US), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (CN), Centre for Theoretical Physics and Astrophysics (UZ), Michigan United (US), California Consortium of Addiction Programs and Professionals (US), Unidades Centrales Científico-Técnicas (ES), Zhongshan Hospital (CN), National Centre for Earth Observation (GB), Institut National de Physique Nucléaire et de Physique des Particules (FR), Community Science and Data Center (US), UC Irvine Health (US), Centro de Investigación en Materiales Avanzados (MX), NSF NOIRLab (US), Tech Pro (China) (CN), Instituto de Astrofísica de Andalucía (ES), National Astronomical Observatories (CN), Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (ES), University College London (GB), The Ohio State University (US), University of Portsmouth (GB), Universidad Intercontinental (MX), Universidad Nacional Autónoma de México (MX), Stanford University (US)
National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, Gordon and Betty Moore Foundation, California Institute of Technology, Heising-Simons Foundation, Ministerio de Ciencia, Innovación y Universidades, National Research Foundation, National Natural Science Foundation of China, Chinese Academy of Sciences, Korea Astronomy and Space Science Institute, National Research Foundation of Korea, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Office of Science, Jet Propulsion Laboratory, Science and Technology Facilities Council, Agencia Estatal de Investigación, Basic and Applied Basic Research Foundation of Guangdong Province, Division of Astronomical Sciences, High Energy Physics, Lawrence Berkeley National Laboratory, Northwest Fisheries Science Center
Openalex Percentile: Top 21%
Galaxies: Formation, Evolution, Phenomena
1.15
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.