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从小尺度CMB中获取宇宙学信息是II的前景。动力学Sunyaev Zel'dovich效应

Retrieving cosmological information from small-scale CMB foregrounds II. The kinetic Sunyaev Zel'dovich effect

Adélie Gorce, Marian Douspis, Laura Salvati

备注：
The code used to estimate the kSZ and tSZ power spectra from cosmological parameters can be found at https://szdb.osups.universite-paris-saclay.fr/. This paper is the second of a series of two (the first one is arXiv:2109.03272)
发表信息：
A&A 662, A122 (2022)
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摘要：

地面望远镜的最新结果给出了小尺度上的CMB温度功率谱的高质量测量结果，激发了对前景精确模型的需求，前景在这些多极的主要信号中占据主导地位。在以前的工作中，我们已经表明，宇宙学信息可以从热SZ效应的功率谱中检索。在这项工作中，我们介绍了物理动机的宇宙学分析的CMB数据，这是在所有尺度上的一致性的再电离时代的模型。特别是，在高多极，动力学SZ（kSZ）效应的功率谱推断从一组宇宙学和再电离参数的机器学习算法。首先，在普朗克2018年数据分析中包括再电离历史的非对称参数化，我们检索了与先前结果一致的光学深度值，但源于完全不同的再电离历史，其中第一个光源早在$z=15$就点亮了。考虑到来自SPT的最新小尺度数据，并让宇宙学自由变化，我们发现，包括新的宇宙学相关的SZ光谱有助于通过打破其简并性来收紧对其振幅的约束。我们报告了在$\ell=3000$，$\mathcal{D}_{3000}^\mathrm{kSZ} = 3.4^{+0.5}_{-0.3}\,μ\mathrm{K}^2$在68%的置信水平，边缘化的宇宙学，以及上限的补丁信号从再电离$\mathcal{D}_{3000}^\mathrm{pkSZ}<1.6~μ\mathrm{K}^2$（95% C.L.）的kSZ信号的$5σ$测量。此外，我们发现，SPT数据有利于比普朗克稍早的再电离情景，导致$τ= 0.062 ^{+0.012}_{-0.015}$和再电离中点$z_\mathrm{re} = 7.9^{+1.1}_{-1.3}$（68% C.L.），这符合高红移类星体和星系的限制。

英文摘要：

Recent results of ground-based telescopes, giving high-quality measurements of the CMB temperature power spectrum on small scales motivate the need for an accurate model of foregrounds, which dominate the primary signal at these multipoles. In a previous work, we have shown that cosmological information could be retrieved from the power spectrum of the thermal SZ effect. In this work, we introduce a physically motivated model of the Epoch of Reionisation in the cosmological analysis of CMB data, which is coherent on all scales. In particular, at high multipoles, the power spectrum of the kinetic SZ (kSZ) effect is inferred from a set of cosmological and reionisation parameters by a machine-learning algorithm. First including an asymmetric parameterisation of the reionisation history in the Planck 2018 data analysis, we retrieve a value of the optical depth consistent with previous results, but stemming from a completely different history of reionisation in which the first luminous sources light up as early as $z=15$. Considering the latest small-scale data from the SPT and letting the cosmology free to vary, we find that including the new cosmology-dependent SZ spectra helps tighten the constraints on their amplitudes by breaking their degeneracy. We report a $5σ$ measurement of the kSZ signal at $\ell=3000$, $\mathcal{D}_{3000}^\mathrm{kSZ} = 3.4^{+0.5}_{-0.3}\,μ\mathrm{K}^2$ at the 68% confidence level, marginalised over cosmology, as well as an upper limit on the patchy signal from reionisation $\mathcal{D}_{3000}^\mathrm{pkSZ}<1.6~μ\mathrm{K}^2$ (95% C.L.). Additionally, we find that the SPT data favour slightly earlier reionisation scenarios than Planck, leading to $τ= 0.062 ^{+0.012}_{-0.015}$ and a reionisation midpoint $z_\mathrm{re} = 7.9^{+1.1}_{-1.3}$ (68% C.L.), which is in line with constraints from high-redshift quasars and galaxies.

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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