Measuring galaxy-galaxy-galaxy-lensing with higher precision and accuracy
Measuring galaxy-galaxy-galaxy-lensing with higher precision and accuracy
复制标题
以更高的精度和准确度测量星系-星系-星系-透镜
DOI：
10.1051/0004-6361/201936693
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发表时间：
2020
影响因子：
6.5
通讯作者：
Hilbert
中科院分区：
文献类型：
--
作者：
Schneider;Hilbert
背景星系-星系-星系透镜（G3 L）是一个强大的工具，用于限制星系和物质分布之间的三点相关性，从而建立星系演化模型。（i）根据它们的红移差对透镜星系进行加权，（ii）三点相关函数的自适应合并，以及（iii）解释宇宙大尺度结构的透镜放大效应。改进（i）旨在提高G3 L测量的精度，而改进（ii）和（iii）消除了估计量的偏差。我们进一步展示了如何G3 L信号可以从角度转换为物理scales.MethodsThe改进进行了测试，简单的模拟数据和模拟数据的基础上的千年运行与实现半解析galaxymodel.ResultsOur改进增加了35%的信噪比平均在角度尺度和10′之间和物理尺度之间的0.02和2 h-1 Mpc。它们还消除了G3 L估计量在1′以下角标度时的偏差，该偏差最初高达40%。由于透镜放大而产生的信号约为总信号的10%。
ContextGalaxy-galaxy-galaxy lensing (G3L) is a powerful tool for constraining the three-point correlation between the galaxy and matter distribution and thereby models of galaxy evolution.AimsWe propose three improvements to current measurements of G3L: (i) a weighting of lens galaxies according to their redshift difference, (ii) adaptive binning of the three-point correlation function, and (iii) accounting for the effect of lens magnification by the cosmic large-scale structure. Improvement (i) is designed to improve the precision of the G3L measurement, whereas improvements (ii) and (iii) remove biases of the estimator. We further show how the G3L signal can be converted from angular into physical scales.MethodsThe improvements were tested on simple mock data and simulated data based on the Millennium Run with an implemented semi-analytic galaxy model.ResultsOur improvements increase the signal-to-noise ratio by 35% on average at angular scales between and 10′ and physical scales between 0.02 and 2h−1Mpc. They also remove the bias of the G3L estimator at angular scales below 1′, which was originally up to 40%. The signal due to lens magnification is approximately 10% of the total signal.
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影响因子：
4.8
作者：
Hiroto Kondo;H. Miyatake;M. Shirasaki;N. Sugiyama;A. Nishizawa
通讯作者：
Hiroto Kondo;H. Miyatake;M. Shirasaki;N. Sugiyama;A. Nishizawa
影响因子：
6.5
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影响因子：
6.5
作者：
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影响因子：
6.5
作者：
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通讯作者：
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影响因子：
4.8
作者：
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