论文标题
剪切测量与分辨不良的图像
Shear Measurement with Poorly Resolved Images
论文作者
论文摘要
弱透镜研究通常需要出色的观察条件，以最大程度地提高分辨出良好的星系图像的数量密度。有趣的是，询问视线大小在多大程度上限制了弱镜头中天文图像的有用性。在这项工作中，我们使用DECAM Legacy调查（贴花）的数据研究了这个问题，这是黑暗能源光谱仪器（DESI）目标选择计划的一部分。使用傅立叶四剪切测量管道，我们证明了看见条件相对较差的图像（约1.5 arcsec）仍然可以产生准确的剪切估计器。我们没有发现系统剪切误差与图像分辨率之间的任何相关性。
Weak lensing studies typically require excellent seeing conditions for the purpose of maximizing the number density of well-resolved galaxy images. It is interesting to ask to what extent the seeing size limits the usefulness of the astronomical images in weak lensing. In this work, we study this issue with the data of the DECam Legacy Survey (DECaLS), which is a part of the target selection program for the Dark Energy Spectroscopic Instrument (DESI). Using the Fourier Quad shear measurement pipeline, we demonstrate that images with relatively poor seeing conditions (around 1.5 arcsec) can still yield accurate shear estimators. We do not find any correlation between systematic shear error and the image resolution.
