剪切比试验中的放大偏倚：一种可行的缓解策略
Magnification bias in the shear-ratio test: a viable mitigation strategy
摘要：
对于同一个透镜星系，不同源星系红移的切向切变之比等于它们对应的角径距离之比。这就是所谓的剪切比试验（SRT），当可以忽略干预的大尺度结构（LSS）引起的影响时，它是有效的。主要的LSS效应是放大偏倚，其一方面引起额外的剪切，另一方面引起晶状体群体的放大。我们的目标是量化SRT的放大偏倚，并显示一种易于应用的缓解策略，不依赖于额外的观察。我们使用射线跟踪数据，通过千年模拟测量放大的SRT的影响，并测试我们的缓解策略。使用SRT作为零测试，我们发现偏差从零到$10 \%$的透镜星系的通量有限的样本，这是一个强大的功能的透镜红移和透镜源的视线分离。使用我们的缓解策略，我们可以提高零测试的一个因素的$\sim \!100$。
英文摘要：
Using the same lens galaxies, the ratios of tangential shears for different source galaxy redshifts is equal to the ratios of their corresponding angular-diameter distances. This is the so-called shear-ratio test (SRT) and it is valid when effects induced by the intervening large-scale structure (LSS) can be neglected. The dominant LSS effect is magnification bias which, on the one hand, induces an additional shear, and on the other hand, causes a magnification of the lens population. Our objective is to quantify the magnification bias for the SRT and show an easy-to-apply mitigation strategy that does not rely on additional observations. We use ray-tracing data through the Millennium simulation to measure the influence of magnification on the SRT and test our mitigation strategy. Using the SRT as a null-test we find deviations from zero up to $10 \%$ for a flux-limited sample of lens galaxies, which is a strong function of lens redshift and the lens-source line-of-sight separation. Using our mitigation strategy we can improve the null-test by a factor of $\sim \!100$.
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