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arXiv 2408.15909astro-ph.CO
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利用DESI Legacy Imaging Surveys发射线星系与Planck CMB透镜测量σ₈及尘埃对参数推断的影响

Measuring $σ_8$ using DESI Legacy Imaging Surveys Emission-Line Galaxies and Planck CMB Lensing and the Impact of Dust on Parameter Inference

Tanveer Karim, Sukhdeep Singh, Mehdi Rezaie, Daniel Eisenstein, Boryana Hadzhiyska, Joshua S. Speagle, Jessica Nicole Aguilar, Steven Ahlen, David Brooks, Todd … 展开作者

Tanveer Karim, Sukhdeep Singh, Mehdi Rezaie, Daniel Eisenstein, Boryana Hadzhiyska, Joshua S. Speagle, Jessica Nicole Aguilar, Steven Ahlen, David Brooks, Todd Claybaugh, Axel de la Macorra, Simone Ferraro, Jaime E. Forero-Romero, Enrique Gaztañaga, Satya Gontcho A Gontcho, Gaston Gutierrez, Julien Guy, Klaus Honscheid, Stephanie Juneau, David Kirkby, Alex Krolewski, Andrew Lambert, Martin Landriau, Michael Levi, Aaron Meisner, Ramon Miquel, John Moustakas, Andrea Muñoz-Gutiérrez, Adam Myers, Gustavo Niz, Nathalie Palanque Delabrouille, Will Percival, Francisco Prada, Graziano Rossi, Eusebio Sanchez, Edward Schlafly, David Schlegel, Michael Schubnell, David Sprayberry, Gregory Tarlé, Benjamin Alan Weaver, Hu Zou

AI总结:

本文利用DESI Legacy Imaging Surveys的2400万发射线星系与Planck CMB透镜功率谱测量σ₈,发现尘埃图选择显著影响σ₈和Ω_M的推断结果,最高偏好值与Planck结果存在约3σ张力,指出需高红移层析分析与系统误差联合建模。

摘要:

测量结构增长是研究暗区段的有力探针,尤其是在原初CMB各向异性与低红移巡天之间存在σ₈张力的背景下。本文利用暗能量光谱仪遗产成像巡天(Dark Energy Spectroscopic Instrument Legacy Imaging Surveys)发射线星系(Emission-Line Galaxies)与Planck 2018 CMB透镜图的星系-星系及星系-CMB透镜功率谱,给出了物质功率谱振幅σ₈的新测量。我们构建了一个包含2400万个星系、纯度为85%的ELG星表,覆盖红移范围0 < z < 3,平均红移z_mean = 1.09。我们实施了若干新颖的系统误差修正,例如联合建模成像系统误差和测光红移不确定性对协方差矩阵的贡献。我们还研究了不同尘埃图对宇宙学参数推断的影响。我们在f_sky = 0.25的天区上测量了交叉功率谱,信背比最高达到30σ。我们发现,在估计ELG过密度场时用于考虑成像系统误差的尘埃图选择对最终估计的σ₈和Ω_M值有显著影响:基于远红外发射的尘埃图倾向于σ₈低至0.702 ± 0.030,而基于恒星红化的尘埃图倾向于高达0.719 ± 0.030。最高偏好值与Planck原初各向异性结果之间存在约3σ的张力。这些发现表明需要在高红移进行层析分析并对系统误差进行联合建模。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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