Dark Energy Survey Year 3 results: Curved-sky weak lensing mass map reconstruction
Dark Energy Survey Year 3 results: Curved-sky weak lensing mass map reconstruction
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DOI：
10.1093/mnras/stab1495
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发表时间：
2021-05
影响因子：
4.8
通讯作者：
N. Jeffrey;M. Gatti;C. Chang;L. Whiteway;U. Demirbozan;A. Kovács;G. Pollina;D. Bacon;N. Ham
中科院分区：
文献类型：
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作者：
N. Jeffrey;M. Gatti;C. Chang;L. Whiteway;U. Demirbozan;A. Kovács;G. Pollina;D. Bacon;N. Ham
我们展示了从暗能量调查（DES）第三年（Y3）弱引力透镜数据集重建的收敛图，质量图。质量图是被观测星系前景中密度场（主要是暗物质）的加权投影。我们使用了四种重建方法，每种方法都是对地图的先验概率使用不同模型的最大后验估计：Kaiser-Squires， null B-mode先验，高斯先验和稀疏先验。所有方法都是在天球上实现的，以适应DES Y3数据的大天空覆盖。我们将使用与DES Y3数据密切匹配的模拟数据进行真实ΛCDM模拟的方法进行比较。我们在地图级别量化方法的性能，然后将重建方法应用于DES Y3数据，对系统误差效应进行测试。这些图与光学前景宇宙网结构进行了比较，并用于评估来自宇宙空洞剖面的透镜信号。恢复的暗物质图覆盖了迄今为止任何星系弱透镜图中最大的天空部分。
We present reconstructed convergence maps, mass maps, from the Dark Energy Survey (DES) third year (Y3) weak gravitational lensing data set. The mass maps are weighted projections of the density field (primarily dark matter) in the foreground of the observed galaxies. We use four reconstruction methods, each is a maximum a posteriori estimate with a different model for the prior probability of the map: Kaiser–Squires, null B-mode prior, Gaussian prior, and a sparsity prior. All methods are implemented on the celestial sphere to accommodate the large sky coverage of the DES Y3 data. We compare the methods using realistic ΛCDM simulations with mock data that are closely matched to the DES Y3 data. We quantify the performance of the methods at the map level and then apply the reconstruction methods to the DES Y3 data, performing tests for systematic error effects. The maps are compared with optical foreground cosmic-web structures and are used to evaluate the lensing signal from cosmic-void profiles. The recovered dark matter map covers the largest sky fraction of any galaxy weak lensing map to date.