Dark energy survey year 3 results: High-precision measurement and modeling of galaxy-galaxy lensing

Dark energy survey year 3 results: High-precision measurement and modeling of galaxy-galaxy lensing
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暗能量调查第三年结果:星系-星系透镜效应的高精度测量和建模

DOI:
10.1103/physrevd.105.083528
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发表时间:
2022
期刊:
影响因子:
5
通讯作者:
Amon, A.
Amon, A.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Prat, J.;Blazek, J.;Sánchez, C.;Tutusaus, I.;Pandey, S.;Elvin-Poole, J.;Krause, E.;Troxel, M. A.;Secco, L. F.;Amon, A.

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我们提出并描述了星系-星系透镜信号测量的头三年的数据从暗能量调查(DES Y3)覆盖。这些星系-星系的测量结果被用于DES Y3宇宙学分析,它结合了弱透镜和星系聚类信息。我们使用了两个透镜样本:一个是限星等样本,另一个是红魔样本,它们分别跨越了10.7和2.6 M星系的红移范围。对于源星表,我们使用的metacalibrationshape样本,组成的星系分为四个层析箱。我们的星系-星系透镜估计是平均切向剪切,对于它,我们得到的总信噪比为formaglim(对于redmagic),和()在应用的尺度切割后。因此,我们达到了100级的统计精度,这要求我们的建模和系统误差控制具有可比的精度。切向剪切模型中使用的thecosmological分析包括透镜放大率,一个五参数的内在排列模型,边缘化的一个点质量,以消除信息从小尺度和线性星系偏置模型与高阶项验证。我们探讨了这些选择的切向剪切观察的影响,并研究了未包括在我们的模型,如减少剪切,源放大,源聚类的影响的意义。我们还测试了我们的测量的鲁棒性,各种观测和系统学的影响,如观测条件的影响,镜头源聚类,随机点减法,尺度依赖元校准响应,点扩散函数残差,和B模式。
We present and characterize the galaxy-galaxy lensing signal measured using the first three years of data from the Dark Energy Survey (DES Y3) covering. These galaxy-galaxy measurements are used in the DES Y3cosmological analysis, which combines weak lensing and galaxy clustering information. We use two lens samples: a magnitude-limited sample and the redmagicsample, which span the redshift rangewith 10.7 and 2.6 M galaxies, respectively. For the source catalog, we use themetacalibrationshape sample, consisting ofgalaxies separated into four tomographic bins. Our galaxy-galaxy lensing estimator is the mean tangential shear, for which we obtain a total SNR offormaglim (for redmagic), and() after applying the scale cuts of. Thus we reach percent-level statistical precision, which requires that our modeling and systematic-error control be of comparable accuracy. The tangential shear model used in thecosmological analysis includes lens magnification, a five-parameter intrinsic alignment model, marginalization over a point mass to remove information from small scales and a linear galaxy bias model validated with higher-order terms. We explore the impact of these choices on the tangential shear observable and study the significance of effects not included in our model, such as reduced shear, source magnification, and source clustering. We also test the robustness of our measurements to various observational and systematics effects, such as the impact of observing conditions, lens-source clustering, random-point subtraction, scale-dependentmetacalibrationresponses, point spread function residuals, and B modes.
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