Measuring σ <sub>8</sub> using DESI Legacy Imaging Surveys Emission-Line galaxies and Planck CMB lensing, and the impact of dust on parameter inference
Abstract Measuring the growth of structure is a powerful probe for studying the dark sector, especially in light of the σ 8 tension between primary CMB anisotropy and low-redshift surveys. This paper provides a new measurement of the amplitude of the matter power spectrum, σ 8 , using galaxy-galaxy and galaxy-CMB lensing power spectra of Dark Energy Spectroscopic Instrument Legacy Imaging Surveys Emission-Line Galaxies and the Planck 2018 CMB lensing map. We create an ELG catalog composed of 24 million galaxies and with a purity of 85%, covering a redshift range 0 < z < 3, with z mean = 1.09. We implement several novel systematic corrections, such as jointly modeling the contribution of imaging systematics and photometric redshift uncertainties to the covariance matrix. We also study the impacts of various dust maps on cosmological parameter inference. We measure the cross-power spectra over f sky = 0.25 with a signal-to-background ratio of up to 30 σ . We find that the choice of dust maps to account for imaging systematics in estimating the ELG overdensity field has a significant impact on the final estimated values of σ 8 and Ω M , with far-infrared emission-based dust maps preferring σ 8 to be as low as 0.702 ± 0.030, and stellar-reddening-based dust maps preferring as high as 0.719 ± 0.030. The highest preferred value is at ∼ 3 σ tension with the Planck primary anisotropy results. These findings indicate a need for tomographic analyses at high redshifts and joint modeling of systematics.
Authors
- D. Kirkby (ORCID: https://orcid.org/0000-0002-8828-5463)
- Will J. Percival (ORCID: https://orcid.org/0000-0002-0644-5727)
- D. Brooks (ORCID: https://orcid.org/0000-0002-8458-5047)
- Sukhdeep Singh (ORCID: https://orcid.org/0000-0001-6289-9208)
- A. Muñoz-Gutiérrez (ORCID: https://orcid.org/0000-0002-3565-0148)
- S. Juneau (ORCID: https://orcid.org/0000-0002-0000-2394)
- Michael S. Schubnell (ORCID: https://orcid.org/0000-0001-9504-2059)
- N. Palanque‐Delabrouille (ORCID: https://orcid.org/0000-0003-3188-784X)
- Gregory Tarlé (ORCID: https://orcid.org/0000-0003-1704-0781)
- David Sprayberry (ORCID: https://orcid.org/0000-0001-7583-6441)
- Gustavo Niz (ORCID: https://orcid.org/0000-0002-1544-8946)
- David J. Schlegel (ORCID: https://orcid.org/0000-0002-5042-5088)
- Axel de la Macorra (ORCID: https://orcid.org/0000-0002-1769-1640)
- Martin Landriau (ORCID: https://orcid.org/0000-0003-1838-8528)
- Alex Krolewski (ORCID: https://orcid.org/0000-0003-2183-7021)
- Simone Ferraro (ORCID: https://orcid.org/0000-0003-4992-7854)
- Gaston Gutierrez (ORCID: https://orcid.org/0000-0003-0825-0517)
- J. Aguilar (ORCID: https://orcid.org/0000-0003-0822-452X)
- J. Guy (ORCID: https://orcid.org/0000-0001-9822-6793)
- Eusebio Sanchez (ORCID: https://orcid.org/0000-0002-9646-8198)
- Satya Gontcho A Gontcho (ORCID: https://orcid.org/0000-0003-3142-233X)
- Joshua S. Speagle (ORCID: https://orcid.org/0000-0003-2573-9832)
- Tanveer Karim (ORCID: https://orcid.org/0000-0002-5652-8870)
- ENRIQUE GAZTAÑAGA (ORCID: https://orcid.org/0000-0001-9632-0815)
- Edward F. Schlafly (ORCID: https://orcid.org/0000-0002-3569-7421)
- Steven P. Ahlen (ORCID: https://orcid.org/0000-0001-6098-7247)
- Aaron Meisner (ORCID: https://orcid.org/0000-0002-1125-7384)
- R. Miquel (ORCID: https://orcid.org/0000-0002-6610-4836)
- Mehdi Rezaie (ORCID: https://orcid.org/0000-0001-5589-7116)
- John Moustakas (ORCID: https://orcid.org/0000-0002-2733-4559)
- Hu Zou (ORCID: https://orcid.org/0000-0002-6684-3997)
- T. Claybaugh (ORCID: https://orcid.org/0000-0002-5024-6987)
- Graziano Rossi
- Boryana Hadzhiyska (ORCID: https://orcid.org/0000-0002-2312-3121)
- Benjamin A. Weaver
- J. E. Forero-Romero (ORCID: https://orcid.org/0000-0002-2890-3725)
- Michael Levi (ORCID: https://orcid.org/0000-0003-1887-1018)
- Daniel J. Eisenstein (ORCID: https://orcid.org/0000-0002-2929-3121)
- Klaus Honscheid
- Andrew Lambert (ORCID: https://orcid.org/0009-0003-5658-2601)
- Adam D. Myers
- Francisco Prada (ORCID: https://orcid.org/0000-0001-7145-8674)
Institutions
- Boston University (US)
- Institució Catalana de Recerca i Estudis Avançats (ES)
- Universidad Complutense de Madrid (ES)
- University of Wyoming (US)
- Space Telescope Science Institute (US)
- Universidad de Guanajuato (MX)
- Fermi National Accelerator Laboratory (US)
- Institute of Space Sciences (ES)
- Lawrence Berkeley National Laboratory (US)
- University of Waterloo (CA)
- Universidad de Los Andes (CO)
- Perimeter Institute (CA)
- University of Toronto (CA)
- Institute for High Energy Physics (ES)
- Kansas State University (US)
- Chinese Academy of Sciences (CN)
- University of California, Irvine (US)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Université Paris-Saclay (FR)
- University of Michigan (US)
- Miller College (US)
- Harvard University Press (US)
- Sejong University (KR)
- Institut d'Estudis Espacials de Catalunya (ES)
- Canadian Institute for Theoretical Astrophysics (CA)
- CEA Paris-Saclay (FR)
- Community Science and Data Center (US)
- Centro de Investigación en Materiales Avanzados (MX)
- Instituto de Astrofísica de Andalucía (ES)
- National Astronomical Observatories (CN)
- Institut de Recherche sur les Lois Fondamentales de l'Univers (FR)
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (ES)
- University College London (GB)
- The Ohio State University (US)
- University of Portsmouth (GB)
- Carnegie Mellon University (US)
- Universidad Nacional Autónoma de México (MX)
- Siena College (US)
- University of California, Berkeley (US)
Publication Details
- Journal
- Journal of Cosmology and Astroparticle Physics
- Published
- 2025-02-01
- DOI
- https://doi.org/10.1088/1475-7516/2025/02/045
- Citations
- 16
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 18.48