Measuring $σ_8$ using DESI Legacy Imaging Surveys Emission-Line Galaxies and Planck CMB Lensing and the Impact of Dust on Parameter Inference
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2024
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| author | Karim, Tanveer Singh, Sukhdeep Rezaie, Mehdi Eisenstein, Daniel Hadzhiyska, Boryana Speagle, Joshua S. Aguilar, Jessica Nicole Ahlen, Steven Brooks, David Claybaugh, Todd de la Macorra, Axel Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Honscheid, Klaus Juneau, Stephanie Kirkby, David Krolewski, Alex Lambert, Andrew Landriau, Martin Levi, Michael Meisner, Aaron Miquel, Ramon Moustakas, John Muñoz-Gutiérrez, Andrea Myers, Adam Niz, Gustavo Delabrouille, Nathalie Palanque Percival, Will Prada, Francisco Rossi, Graziano Sanchez, Eusebio Schlafly, Edward Schlegel, David Schubnell, Michael Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zou, Hu |
| author_facet | Karim, Tanveer Singh, Sukhdeep Rezaie, Mehdi Eisenstein, Daniel Hadzhiyska, Boryana Speagle, Joshua S. Aguilar, Jessica Nicole Ahlen, Steven Brooks, David Claybaugh, Todd de la Macorra, Axel Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Honscheid, Klaus Juneau, Stephanie Kirkby, David Krolewski, Alex Lambert, Andrew Landriau, Martin Levi, Michael Meisner, Aaron Miquel, Ramon Moustakas, John Muñoz-Gutiérrez, Andrea Myers, Adam Niz, Gustavo Delabrouille, Nathalie Palanque Percival, Will Prada, Francisco Rossi, Graziano Sanchez, Eusebio Schlafly, Edward Schlegel, David Schubnell, Michael Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zou, Hu |
| contents | 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 $\textit{Planck}$ 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 $z_{\rm mean} = 1.09$. 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 $f_{\rm sky} = 0.25$ with a signal-to-background ratio of up to $ 30σ$. 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 $Ω_{\rm M}$, with far-infrared emission-based dust maps preferring $σ_8$ to be as low as $0.702 \pm 0.030$, and stellar-reddening-based dust maps preferring as high as $0.719 \pm 0.030$. The highest preferred value is at $\sim 3 σ$ tension with the $\textit{Planck}$ primary anisotropy results. These findings indicate a need for tomographic analyses at high redshifts and joint modeling of systematics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_15909 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measuring $σ_8$ using DESI Legacy Imaging Surveys Emission-Line Galaxies and Planck CMB Lensing and the Impact of Dust on Parameter Inference Karim, Tanveer Singh, Sukhdeep Rezaie, Mehdi Eisenstein, Daniel Hadzhiyska, Boryana Speagle, Joshua S. Aguilar, Jessica Nicole Ahlen, Steven Brooks, David Claybaugh, Todd de la Macorra, Axel Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Honscheid, Klaus Juneau, Stephanie Kirkby, David Krolewski, Alex Lambert, Andrew Landriau, Martin Levi, Michael Meisner, Aaron Miquel, Ramon Moustakas, John Muñoz-Gutiérrez, Andrea Myers, Adam Niz, Gustavo Delabrouille, Nathalie Palanque Percival, Will Prada, Francisco Rossi, Graziano Sanchez, Eusebio Schlafly, Edward Schlegel, David Schubnell, Michael Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zou, Hu Cosmology and Nongalactic Astrophysics 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 $\textit{Planck}$ 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 $z_{\rm mean} = 1.09$. 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 $f_{\rm sky} = 0.25$ with a signal-to-background ratio of up to $ 30σ$. 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 $Ω_{\rm M}$, with far-infrared emission-based dust maps preferring $σ_8$ to be as low as $0.702 \pm 0.030$, and stellar-reddening-based dust maps preferring as high as $0.719 \pm 0.030$. The highest preferred value is at $\sim 3 σ$ tension with the $\textit{Planck}$ primary anisotropy results. These findings indicate a need for tomographic analyses at high redshifts and joint modeling of systematics. |
| title | Measuring $σ_8$ using DESI Legacy Imaging Surveys Emission-Line Galaxies and Planck CMB Lensing and the Impact of Dust on Parameter Inference |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2408.15909 |