KiDS-450: The tomographic weak lensing power spectrum and constraints on cosmological parameters
KiDS-450: The tomographic weak lensing power spectrum and constraints on cosmological parameters
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DOI：
10.1093/mnras/stx1820
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发表时间：
2017-06
影响因子：
4.8
通讯作者：
F. Köhlinger;F. Köhlinger;M. Viola;B. Joachimi;H. Hoekstra;E. V. Uitert;H. Hildebrandt;A. Choi;A. Choi;T. Erben;C. Heymans;S. Joudaki;D. Klaes;K. Kuijken;J. Merten;L. Miller;P. Schneider;E. Valentijn
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作者：
F. Köhlinger;F. Köhlinger;M. Viola;B. Joachimi;H. Hoekstra;E. V. Uitert;H. Hildebrandt;A. Choi;A. Choi;T. Erben;C. Heymans;S. Joudaki;D. Klaes;K. Kuijken;J. Merten;L. Miller;P. Schneider;E. Valentijn
我们提出了基于 450 美元平方度的弱引力透镜剪切功率谱的测量结果。来自千度调查的成像数据。我们在两个和三个红移箱中采用二次估计器，并提取多极范围 $76 \leq \ell \leq 1310$ 中红移自相关和互相关谱的带功率。测量的剪切功率谱的宇宙学解释是在贝叶斯框架中进行的，假设具有空间平坦几何形状的 $\Lambda$CDM 模型，同时考虑剪切校准和红移分布中的小残留不确定性，以及边缘化内在对准、重子反馈和过量噪声功率模型。此外，模型中还包含大量中微子。宇宙学主要结果以参数组合 $S_8 \equiv \sigma_8 \sqrt{\Omega_{\rm m}/0.3}$ 表示，得出 $S_8 = \ 0.651 \pm 0.058$ (3 z-bins)，证实了最近报告的该参数中的张力，并受到普朗克在 $3.2\sigma$ (3 z-bins) 的约束。我们将 3 z-bin 分析的结果与 2 z-bin 分析的较弱约束进行交叉检查，发现它们是一致的。该分析的高级数据产品，例如带功率测量、协方差矩阵、红移分布和似然评估链，可在 http://kids.strw.leidenuniv.nl/ 上获取。
We present measurements of the weak gravitational lensing shear power spectrum based on $450$ sq. deg. of imaging data from the Kilo Degree Survey. We employ a quadratic estimator in two and three redshift bins and extract band powers of redshift auto-correlation and cross-correlation spectra in the multipole range $76 \leq \ell \leq 1310$. The cosmological interpretation of the measured shear power spectra is performed in a Bayesian framework assuming a $\Lambda$CDM model with spatially flat geometry, while accounting for small residual uncertainties in the shear calibration and redshift distributions as well as marginalising over intrinsic alignments, baryon feedback and an excess-noise power model. Moreover, massive neutrinos are included in the modelling. The cosmological main result is expressed in terms of the parameter combination $S_8 \equiv \sigma_8 \sqrt{\Omega_{\rm m}/0.3}$ yielding $S_8 = \ 0.651 \pm 0.058$ (3 z-bins), confirming the recently reported tension in this parameter with constraints from Planck at $3.2\sigma$ (3 z-bins). We cross-check the results of the 3 z-bin analysis with the weaker constraints from the 2 z-bin analysis and find them to be consistent. The high-level data products of this analysis, such as the band power measurements, covariance matrices, redshift distributions, and likelihood evaluation chains are available at http://kids.strw.leidenuniv.nl/