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Constraining baryonic physics with DES Y1 and Planck data: Combining galaxy clustering, weak lensing, and CMB lensing
Physical Review D ( IF 4.6 ) Pub Date : 2024-09-16 , DOI: 10.1103/physrevd.110.063532
Jiachuan Xu, Tim Eifler, Vivian Miranda, Xiao Fang, Evan Saraivanov, Elisabeth Krause, Hung-Jin Huang, Karim Benabed, Kunhao Zhong

We constrain cosmology and baryonic feedback scenarios with a joint analysis of weak lensing, galaxy clustering, cosmic microwave background (CMB) lensing, and their cross-correlations (so-called 6×2) using data from the Dark Energy Survey (DES) Y1 and the Planck satellite mission. Noteworthy features of our 6×2 pipeline are: We extend CMB lensing cross-correlation measurements to a band surrounding the DES Y1 footprint (around 25% gain in pairs), and we develop analytic covariance capabilities that account for different footprints and all cross-terms in the 6×2 analysis. We also measure the DES Y1 cosmic shear two-point correlation function (2PCF) down to 0.25, but find that going below 2.5 does not increase cosmological information due to shape noise. We model baryonic physics uncertainties via the amplitude of principal components (PCs) derived from a set of hydrosimulations. Given our statistical uncertainties, varying the first PC amplitude Q1 is sufficient to model small scale cosmic shear 2PCF. For DES Y1+Planck 6×2 we find S8=0.799±0.016, comparable to the 5×2 result of DES Y3+SPT/Planck S8=0.773±0.016. Combined with our most informative cosmology priors—baryon acoustic oscillation, big bang nucleosynthesis, type Ia supernovae, and Planck 2018 EE+lowE, we measure S8=0.817±0.011. Regarding baryonic physics constraints, our 6×2 analysis finds Q1=2.8±1.8. Combined with the aforementioned priors, it improves the constraint to Q1=3.5±1.3. For comparison, the strongest feedback scenario considered in this paper, the cosmo-OWLS AGN (ΔTheat=108.7K), corresponds to Q1=5.84.

中文翻译:


使用 DES Y1 和普朗克数据约束重子物理:结合星系聚类、弱透镜和 CMB 透镜



我们通过对弱透镜、星系团、宇宙微波背景(CMB)透镜及其互相关(所谓的互相关)的联合分析来约束宇宙学和重子反馈场景。 6×2 )使用来自暗能量巡天(DES)Y1 和普朗克卫星任务的数据。我们的值得注意的特点 6×2 我们将 CMB 透镜互相关测量扩展到 DES Y1 足迹周围的频带(成对增益约 25%),并且我们开发了分析协方差功能,可以解释不同足迹和 6×2 分析。我们还测量了 DES Y1 宇宙剪切两点相关函数 (2PCF) 0.25 ,但发现下面 2.5 不会因形状噪声而增加宇宙学信息。我们通过一组水文模拟得出的主成分 (PC) 的振幅对重子物理不确定性进行建模。鉴于我们的统计不确定性,改变第一个 PC 幅度 Q1 足以模拟小尺度宇宙剪切力 2PCF。对于 DES Y1+Planck 6×2 我们发现 S8=0.799±0.016 ,相当于 5×2 DES结果 Y3+SPT/Planck S8=0.773±0.016 。结合我们信息最丰富的宇宙学先验知识——重子声振荡、大爆炸核合成、Ia 型超新星和普朗克 2018 EE+lowE ,我们测量 S8=0.817±0.011 。关于重子物理约束,我们的 6×2 分析发现 Q1=2.8±1.8 。结合上述先验,将约束改进为 Q1=3.5±1.3 。为了进行比较,本文考虑了最强的反馈场景,cosmo-OWLS AGN( ΔTheat=108.7K ),对应于 Q1=5.84
更新日期:2024-09-16
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