图像分辨率差的剪切测量
Shear Measurement with Poorly Resolved Images
摘要：
弱透镜研究通常需要良好的视宁度条件，以最大限度地提高分辨率良好的星系图像的数量密度。有趣的是，在弱透镜作用下，视见尺寸在多大程度上限制了天文图像的有用性。在这项工作中，我们研究这个问题的DECam遗产调查（DECaLS），这是一个目标选择计划的一部分，暗能量光谱仪（DESI）的数据。使用傅立叶四切变测量管道，我们证明了相对较差的视觉条件（约1.5弧秒）的图像仍然可以产生准确的切变估计。我们没有发现系统剪切误差和图像分辨率之间的任何相关性。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
