Dark Energy Survey Year 3 results: Cosmology with moments of weak lensing mass maps
Dark Energy Survey Year 3 results: Cosmology with moments of weak lensing mass maps
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DOI：
10.1103/physrevd.106.083509
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发表时间：
2021-10
影响因子：
5
通讯作者：
M.Gatti;B. Jain;C. Chang;M. Raveri;D. Zurcher;L. Secco;L. Whiteway;N. Jeffrey;C. Doux
中科院分区：
文献类型：
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作者：
M.Gatti;B. Jain;C. Chang;M. Raveri;D. Zurcher;L. Secco;L. Whiteway;N. Jeffrey;C. Doux
本文利用暗能量巡天（DES）前三年（Y3）数据的弱透镜质量（会聚）图的二阶矩和三阶矩进行了宇宙学分析。该调查覆盖了4139平方度的有效区域，并使用了超过1亿个星系的图像来重建会聚场。作为平滑尺度的函数的收敛的二阶矩包含类似于标准剪切2点统计的信息。三阶矩或偏度包含额外的非高斯信息。的背景下，$\Lambda$CDM模型，不同的5个宇宙学参数和19滋扰参数建模天体物理和测量系统的数据进行了分析。我们的观测量建模是完全分析，并已在我们以前的方法研究模拟测试。我们得到波动幅度参数S_8\equiv\sigma_8（\Omega_m/0.3）^{0.5} = 0.784\pm 0.013$的1.7\%测量值。测量结果在红移箱、角标度以及二阶和三阶矩之间具有内部一致性。特别是，测得的三阶矩与$\Lambda$CDM模型下引力聚集的预期一致。与仅使用二阶矩的分析相比，添加三阶矩将对$S_8$和$\Omega_{\rm m}$的约束提高了$\sim$15\%和$\sim$25\%。我们比较我们的结果与{\it普朗克}约束的宇宙微波背景（CMB），找到一个2.2 $ \textendash 2.8\sigma $紧张的全参数空间，根据考虑的时刻的组合。第三个时刻独立地与{\it Planck}处于2.8\sigma $张力中，因此提供了对2点相关性分析的交叉检查。
We present a cosmological analysis using the second and third moments of the weak lensing mass (convergence) maps from the first three years of data (Y3) data of the Dark Energy Survey (DES). The survey spans an effective area of 4139 square degrees and uses the images of over 100 million galaxies to reconstruct the convergence field. The second moment of the convergence as a function of smoothing scale contains information similar to standard shear 2-point statistics. The third moment, or the skewness, contains additional non-Gaussian information. The data is analysed in the context of the $\Lambda$CDM model, varying 5 cosmological parameters and 19 nuisance parameters modelling astrophysical and measurement systematics. Our modelling of the observables is completely analytical, and has been tested with simulations in our previous methodology study. We obtain a 1.7\% measurement of the amplitude of fluctuations parameter $S_8\equiv \sigma_8 (\Omega_m/0.3)^{0.5} = 0.784\pm 0.013$. The measurements are shown to be internally consistent across redshift bins, angular scales, and between second and third moments. In particular, the measured third moment is consistent with the expectation of gravitational clustering under the $\Lambda$CDM model. The addition of the third moment improves the constraints on $S_8$ and $\Omega_{\rm m}$ by $\sim$15\% and $\sim$25\% compared to an analysis that only uses second moments. We compare our results with {\it Planck} constraints from the Cosmic Microwave Background (CMB), finding a $2.2$ \textendash $2.8\sigma$ tension in the full parameter space, depending on the combination of moments considered. The third moment independently is in $2.8\sigma$ tension with {\it Planck}, and thus provides a cross-check on analyses of 2-point correlations.