Point spread function modelling for astronomical telescopes: a review focused on weak gravitational lensing studies

IF 2.6 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Liaudat, Tobias, Starck, Jean-Luc, Kilbinger, Martin, Frugier, Pierre-Antoine
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Abstract

The accurate modelling of the point spread function (PSF) is of paramount importance in astronomical observations, as it allows for the correction of distortions and blurring caused by the telescope and atmosphere. PSF modelling is crucial for accurately measuring celestial objects’ properties. The last decades have brought us a steady increase in the power and complexity of astronomical telescopes and instruments. Upcoming galaxy surveys like Euclid and Legacy Survey of Space and Time (LSST) will observe an unprecedented amount and quality of data. Modelling the PSF for these new facilities and surveys requires novel modelling techniques that can cope with the ever-tightening error requirements. The purpose of this review is threefold. Firstly, we introduce the optical background required for a more physically motivated PSF modelling and propose an observational model that can be reused for future developments. Secondly, we provide an overview of the different physical contributors of the PSF, which includes the optic- and detector-level contributors and atmosphere. We expect that the overview will help better understand the modelled effects. Thirdly, we discuss the different methods for PSF modelling from the parametric and non-parametric families for ground- and space-based telescopes, with their advantages and limitations. Validation methods for PSF models are then addressed, with several metrics related to weak-lensing studies discussed in detail. Finally, we explore current challenges and future directions in PSF modelling for astronomical telescopes.
天文望远镜的点扩展函数建模:聚焦于弱引力透镜研究的综述
点扩散函数(PSF)的精确建模在天文观测中是至关重要的,因为它允许校正由望远镜和大气引起的扭曲和模糊。PSF模型对于精确测量天体属性至关重要。在过去的几十年里,天文望远镜和仪器的功率和复杂性稳步增加。即将到来的星系调查,如欧几里得和遗留时空调查(LSST)将观察到前所未有的数据量和质量。为这些新设施和调查建立PSF模型需要新颖的建模技术,以应对日益严格的误差要求。本综述的目的有三个方面。首先,我们介绍了物理驱动的PSF建模所需的光学背景,并提出了一个可用于未来发展的观测模型。其次,我们概述了PSF的不同物理贡献者,其中包括光学和探测器级贡献者以及大气。我们期望概述将有助于更好地理解建模效果。第三,讨论了地面和天基望远镜的参数化和非参数化PSF建模的不同方法,以及它们的优点和局限性。然后讨论了PSF模型的验证方法,并详细讨论了与弱透镜研究相关的几个指标。最后,我们探讨了天文望远镜PSF建模目前面临的挑战和未来的发展方向。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Frontiers in Astronomy and Space Sciences
Frontiers in Astronomy and Space Sciences ASTRONOMY & ASTROPHYSICS-
CiteScore
3.40
自引率
13.30%
发文量
363
审稿时长
14 weeks
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