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Localizing Transformations of the Galaxy-Galaxy Lensing Observable
Physical Review Letters ( IF 8.6 ) Pub Date : 2021-01-13 , DOI: 10.1103/physrevlett.126.021301
Youngsoo Park , Eduardo Rozo , Elisabeth Krause

Modern cosmological analyses of galaxy-galaxy lensing face a theoretical systematic effect arising from the nonlocality of the observed galaxy-galaxy lensing signal. Because the predicted tangential shear signal at a given separation depends on the physical modeling on all scales internal to that separation, systematic uncertainties in the modeling of nonlinear small scales are propagated outward to larger scales. Even in the absence of other limiting factors, this systematic effect alone can necessitate conservative small-scale cuts, resulting in significant losses of information in the tangential shear data vector. We construct a simple linear transformation of the standard galaxy-galaxy observable that removes this nonlocality, which ensures that the cosmological signal contained within the transformed observable is exclusively drawn from well-understood physical scales. This new observable, through its robustness against nonlocality, also enables a significant extension in the range of usable scales in galaxy-galaxy lensing compared to the standard approach in current cosmological analyses.

中文翻译:

可观察到的银河-银河系镜头的本地化转换

现代的宇宙学分析对银河系-银河系透镜观测到理论上的系统效应,这是由观测到的银河系-银河系透镜信号的非局部性引起的。由于给定间隔的预测切向切变信号取决于该间隔内部所有尺度上的物理模型,因此非线性小尺度建模中的系统不确定性会向外传播到更大尺度。即使在没有其他限制因素的情况下,仅凭这种系统效果就可能需要进行保守的小规模切割,从而导致切向剪切数据向量中的信息大量丢失。我们构造了一个简单的标准星系-可观察星系的线性变换,以消除这种非局域性,这样可以确保转换后的可观测对象中包含的宇宙信号完全是从易于理解的物理标尺中提取的。与当前宇宙学分析中的标准方法相比,这种新的可观察到的特征(通过其对非局部性的鲁棒性)还使得在银河系和银河系透镜可用尺度范围内的显着扩展成为可能。
更新日期:2021-01-13
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