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arXiv 2007.15632astro-ph.CO
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KiDS-1000宇宙学:多探测器弱引力透镜和光谱星系团约束

KiDS-1000 Cosmology: Multi-probe weak gravitational lensing and spectroscopic galaxy clustering constraints

Catherine Heymans, Tilman Tröster, Marika Asgari, Chris Blake, Hendrik Hildebrandt, Benjamin Joachimi, Konrad Kuijken, Chieh-An Lin, Ariel G. Sánchez, Jan Luca … 展开作者

Catherine Heymans, Tilman Tröster, Marika Asgari, Chris Blake, Hendrik Hildebrandt, Benjamin Joachimi, Konrad Kuijken, Chieh-An Lin, Ariel G. Sánchez, Jan Luca van den Busch, Angus H. Wright, Alexandra Amon, Maciej Bilicki, Jelte de Jong, Martin Crocce, Andrej Dvornik, Thomas Erben, Maria Cristina Fortuna, Fedor Getman, Benjamin Giblin, Karl Glazebrook, Henk Hoekstra, Shahab Joudaki, Arun Kannawadi, Fabian Köhlinger, Chris Lidman, Lance Miller, Nicola R. Napolitano, David Parkinson, Peter Schneider, HuanYuan Shan, Edwin Valentijn, Gijs Verdoes Kleijn, Christian Wolf

摘要:

我们提出了一个联合宇宙学分析弱引力透镜观测从千度调查(KiDS-1000),红移空间星系团观测从重子振荡光谱调查(BOSS),和星系星系透镜观测从KiDS-1000,BOSS和光谱2度场透镜调查(2dFLenS)之间的重叠。这种大尺度结构探测器的组合打破了单个观测量的宇宙学参数之间的简并性,导致对结构生长参数$S_8=σ_8 \sqrt{Ω_{\rm m}/0.3} = 0.766^{+0.020}_{-0.014}$的约束,其总体精度与普朗克全天宇宙微波背景观测报告的精度相同。然而,恢复的$S_8$振幅相对于普朗克低$8.3 \pm 2.6$ %。这一结果建立在一系列KiDS-1000分析的基础上,我们用可变深度的模拟星系调查验证了我们的方法,我们用图像模拟和零测试进行了透镜校准,我们用多波段模拟目录和光谱光度聚类分析进行了光学到近红外红移校准。这些分析所确定的系统不确定性在我们的宇宙学分析中被当作讨厌的参数。检查边缘化的后验分布之间的偏移,我们发现,$S_8$ -与普朗克的差异是由在物质波动振幅参数,$σ_8$的张力。我们量化的CMB和我们的大规模结构约束之间的协议水平,使用一系列不同的指标,发现之间的显着性差异范围$\sim\! 3\,σ$,当考虑在$S_{8}$的偏移,和$\sim\! 2\,σ$,当考虑完整的多维参数空间。

英文摘要:

We present a joint cosmological analysis of weak gravitational lensing observations from the Kilo-Degree Survey (KiDS-1000), with redshift-space galaxy clustering observations from the Baryon Oscillation Spectroscopic Survey (BOSS), and galaxy-galaxy lensing observations from the overlap between KiDS-1000, BOSS and the spectroscopic 2-degree Field Lensing Survey (2dFLenS). This combination of large-scale structure probes breaks the degeneracies between cosmological parameters for individual observables, resulting in a constraint on the structure growth parameter $S_8=σ_8 \sqrt{Ω_{\rm m}/0.3} = 0.766^{+0.020}_{-0.014}$, that has the same overall precision as that reported by the full-sky cosmic microwave background observations from Planck. The recovered $S_8$ amplitude is low, however, by $8.3 \pm 2.6$ % relative to Planck. This result builds from a series of KiDS-1000 analyses where we validate our methodology with variable depth mock galaxy surveys, our lensing calibration with image simulations and null-tests, and our optical-to-near-infrared redshift calibration with multi-band mock catalogues and a spectroscopic-photometric clustering analysis. The systematic uncertainties identified by these analyses are folded through as nuisance parameters in our cosmological analysis. Inspecting the offset between the marginalised posterior distributions, we find that the $S_8$-difference with Planck is driven by a tension in the matter fluctuation amplitude parameter, $σ_8$. We quantify the level of agreement between the CMB and our large-scale structure constraints using a series of different metrics, finding differences with a significance ranging between $\sim\! 3\,σ$, when considering the offset in $S_{8}$, and $\sim\! 2\,σ$, when considering the full multi-dimensional parameter space.

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