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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2501.10759 |
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| _version_ | 1866916649287811072 |
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| author | Saulder, Christoph Song, Yong-Seon Oh, Minji Zheng, Yi Ross, Ashley J. Zhou, Rongpu Newman, Jeffrey A. Chuang, Chia-Hsun Aguilar, Jessica Nicole Ahlen, Steven Blum, Robert Brooks, David Claybaugh, Todd de la Macorra, Axel Dey, Biprateep Ding, Zhejie Doel, Peter Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Juneau, Stephanie Kirkby, David Kisner, Theodore Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael Meisner, Aaron Mueller, Eva-Maria Muñoz-Gutiérrez, Andrea Niz, Gustavo Prada, Francisco Rezaie, Mehdi Rossi, Graziano Sanchez, Eusebio Schubnell, Michael Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Valdes, Francisco Weaver, Benjamin Alan Zou, Hu |
| author_facet | Saulder, Christoph Song, Yong-Seon Oh, Minji Zheng, Yi Ross, Ashley J. Zhou, Rongpu Newman, Jeffrey A. Chuang, Chia-Hsun Aguilar, Jessica Nicole Ahlen, Steven Blum, Robert Brooks, David Claybaugh, Todd de la Macorra, Axel Dey, Biprateep Ding, Zhejie Doel, Peter Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Juneau, Stephanie Kirkby, David Kisner, Theodore Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael Meisner, Aaron Mueller, Eva-Maria Muñoz-Gutiérrez, Andrea Niz, Gustavo Prada, Francisco Rezaie, Mehdi Rossi, Graziano Sanchez, Eusebio Schubnell, Michael Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Valdes, Francisco Weaver, Benjamin Alan Zou, Hu |
| contents | 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 to 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_10759 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Studying baryon acoustic oscillations using photometric redshifts from the DESI Legacy Imaging survey DR9 Saulder, Christoph Song, Yong-Seon Oh, Minji Zheng, Yi Ross, Ashley J. Zhou, Rongpu Newman, Jeffrey A. Chuang, Chia-Hsun Aguilar, Jessica Nicole Ahlen, Steven Blum, Robert Brooks, David Claybaugh, Todd de la Macorra, Axel Dey, Biprateep Ding, Zhejie Doel, Peter Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Juneau, Stephanie Kirkby, David Kisner, Theodore Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael Meisner, Aaron Mueller, Eva-Maria Muñoz-Gutiérrez, Andrea Niz, Gustavo Prada, Francisco Rezaie, Mehdi Rossi, Graziano Sanchez, Eusebio Schubnell, Michael Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Valdes, Francisco Weaver, Benjamin Alan Zou, Hu Cosmology and Nongalactic Astrophysics 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 to 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. |
| title | Studying baryon acoustic oscillations using photometric redshifts from the DESI Legacy Imaging survey DR9 |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2501.10759 |