Ray-tracing log-normal simulation for weak gravitational lensing: applicationto the cross-correlation with galaxies
Ray-tracing log-normal simulation for weak gravitational lensing: applicationto the cross-correlation with galaxies
复制标题
弱引力透镜的射线追踪对数正态模拟：在与星系互相关中的应用
DOI：
10.1088/1475-7516/2021/03/095
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发表时间：
2021
影响因子：
6.4
通讯作者：
Komatsu Eiichiro
中科院分区：
文献类型：
--
作者：
Makiya Ryu;Kayo Issha;Komatsu Eiichiro
本文提出了一种自洽生成红移空间中模拟弱引力透镜收敛场和星系分布的算法。我们生成三维宇宙密度场，遵循对数正态分布，并射线追踪它们产生收敛图。当我们以与射线追踪一致的方式从相同的密度场生成星系分布时，从模拟中测量的星系会聚互功率谱与理论预期一致，精度很高。我们使用这个模拟来预测斯巴鲁超级Suprime-Cam（HSC）和Prime Focus Spectrograph（PFS）调查的星系切变互相关测量的质量。我们发现，名义HSC和PFS调查将检测交叉功率谱的信噪比为20和5，在最低（z= 0.7）和最高（z= 2.2）红移箱，分别。
We present an algorithm to self-consistently generate mock weak gravitational lensing convergence fields and galaxy distributions in redshift space. We generate three-dimensional cosmic density fields that follow a log-normal distribution, and ray-trace them to produce convergence maps. As we generate the galaxy distribution from the same density fields in a manner consistent with ray-tracing, the galaxy-convergence cross-power spectrum measured from the mock agrees with the theoretical expectation with high precision. We use this simulation to forecast the quality of galaxy-shear cross-correlation measurements from the Subaru Hyper Suprime-Cam (HSC) and Prime Focus Spectrograph (PFS) surveys. We find that the nominal HSC and PFS surveys would detect the cross power spectra with signal-to-noise ratios of 20 and 5 at the lowest (z= 0.7) and highest (z= 2.2) redshift bins, respectively.