论文标题

点传播功能的影响更高的力矩误差对弱重力镜头II:一项全面研究

Impact of Point Spread Function Higher Moments Error on Weak Gravitational Lensing II: A Comprehensive Study

论文作者

Zhang, Tianqing, Almoubayyed, Husni, Mandelbaum, Rachel, Meyers, Joshua E., Jarvis, Mike, Kannawadi, Arun, Schmitz, Morgan A., Guinot, Axel, Collaboration, The LSST Dark Energy Science

论文摘要

弱重力镜头或弱镜头是暗物质和暗能科学的最强大的探针之一,尽管随着\ edit(\ edit(\ edit){统计误差变为较小},它面临着越来越多的挑战。需要精确地建模点扩散函数(PSF),以避免在弱透镜测量值上进行系统错误。 PSF模型第二矩(即其大小和形状)在误差中引起的弱透镜偏差是经过充分研究的。但是,张等人。 (2021)表明,在PSF较高矩中的错误也可能是即将进行的弱透镜调查的系统系统的重要来源。因此,这项工作的目的是全面研究$ 3^{\ text {rd}} $到$ 6^{\ text {th}} $ order的$ 3^{\ text {rd}} $的建模质量,并估算其对宇宙参数推断的影响。我们将\ textsc {psfex}传播到HSC调查数据集中的更高矩对弱透镜\ edit \ edit {剪切剪切相关函数}及其宇宙学分析。我们发现,与PSF中的错误相关的总体乘法剪切偏置可能会导致$ \ sim0.1σ$偏移LSST Y10的宇宙学参数。 PSF较高的力矩误差还会导致弱透镜剪切中的添加偏见,如果在宇宙参数分析中未考虑,则可以诱导宇宙参数偏见,可与LSST Y10的$1σ$不确定性相当。我们将\ textsc {psfex}模型与PSF进行比较(\ textsc {piff}),并在对PSF更高的矩进行建模时找到类似的性能。我们得出的结论是,应从当前方法中减少未来PSF模型的PSF较高力矩误差,以避免在弱透镜分析中明确建模这些效果。

Weak gravitational lensing, or weak lensing, is one of the most powerful probes for dark matter and dark energy science, although it faces increasing challenges in controlling systematic uncertainties as \edit{the statistical errors become smaller}. The Point Spread Function (PSF) needs to be precisely modeled to avoid systematic error on the weak lensing measurements. The weak lensing biases induced by errors in the PSF model second moments, i.e., its size and shape, are well-studied. However, Zhang et al. (2021) showed that errors in the higher moments of the PSF may also be a significant source of systematics for upcoming weak lensing surveys. Therefore, the goal of this work is to comprehensively investigate the modeling quality of PSF moments from the $3^{\text{rd}}$ to $6^{\text{th}}$ order, and estimate their impact on cosmological parameter inference. We propagate the \textsc{PSFEx} higher moments modeling error in the HSC survey dataset to the weak lensing \edit{shear-shear correlation functions} and their cosmological analyses. We find that the overall multiplicative shear bias associated with errors in PSF higher moments can cause a $\sim 0.1 σ$ shift on the cosmological parameters for LSST Y10. PSF higher moment errors also cause additive biases in the weak lensing shear, which, if not accounted for in the cosmological parameter analysis, can induce cosmological parameter biases comparable to their $1σ$ uncertainties for LSST Y10. We compare the \textsc{PSFEx} model with PSF in Full FOV (\textsc{Piff}), and find similar performance in modeling the PSF higher moments. We conclude that PSF higher moment errors of the future PSF models should be reduced from those in current methods to avoid a need to explicitly model these effects in the weak lensing analysis.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源