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arXiv 1912.09481astro-ph.IM
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罗马Space Telescope合成高纬度成像巡天:模拟套件和波前误差对弱引力透镜的影响

A Synthetic Roman Space Telescope High-Latitude Imaging Survey: Simulation Suite and the Impact of Wavefront Errors on Weak Gravitational Lensing

M. A. Troxel, H. Long, C. M. Hirata, A. Choi, M. Jarvis, R. Mandelbaum, K. Wang, M. Yamamoto, S. Hemmati, P. Capak

摘要:

Nancy Grace Roman太空望远镜(Roman)任务预计将于2020年代中期发射。它的弱透镜计划旨在实现测光测量中前所未有的系统控制,包括剪切恢复,点扩散函数(PSF)校正和测光校准。这将使精致的弱透镜科学成为可能,并使我们能够在其他同时进行的第四阶段暗能量实验的最初几年观测之后调整并可靠地为宇宙学景观做出贡献。在特派团准备进入建设阶段时,这一潜力同样需要认真规划和验证需求。我们提出了一套基于GalSim的图像模拟,用于构建一个复杂的,合成罗马弱透镜调查,结合现实的输入星系和恒星,相关的探测器非理想性,以及当前的参考五年罗马调查策略。我们提出了第一项研究,以经验验证现有的罗马弱透镜的要求流下来使用一套12匹配的图像模拟,每个代表不同的扰动波前或图像运动模型。这些被选择为引起一系列潜在的静态和低频和高频时间相关的PSF模型误差。我们分析了从这些模拟中的每一个星系的测量形状,并将它们与参考基准模拟进行比较,以推断形状测量对波前模型中的每一个模式的响应。然后,我们比较这与现有的分析流程的要求,并发现经验得出的响应和预测的分析模型之间的一般协议。

英文摘要:

The Nancy Grace Roman Space Telescope (Roman) mission is expected to launch in the mid-2020s. Its weak lensing program is designed to enable unprecedented systematics control in photometric measurements, including shear recovery, point-spread function (PSF) correction, and photometric calibration. This will enable exquisite weak lensing science and allow us to adjust to and reliably contribute to the cosmological landscape after the initial years of observations from other concurrent Stage IV dark energy experiments. This potential requires equally careful planning and requirements validation as the mission prepares to enter its construction phase. We present a suite of image simulations based on GalSim that are used to construct a complex, synthetic Roman weak lensing survey that incorporates realistic input galaxies and stars, relevant detector non-idealities, and the current reference five-year Roman survey strategy. We present a first study to empirically validate the existing Roman weak lensing requirements flowdown using a suite of 12 matched image simulations, each representing a different perturbation to the wavefront or image motion model. These are chosen to induce a range of potential static and low- and high-frequency time-dependent PSF model errors. We analyze the measured shapes of galaxies from each of these simulations and compare them to a reference, fiducial simulation to infer the response of the shape measurement to each of these modes in the wavefront model. We then compare this to existing analytic flowdown requirements, and find general agreement between the empirically derived response and that predicted by the analytic model.

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