标题： 大尺度结构的弱透镜效应与FIRST射电巡天 显示英文标题

标题： Weak Lensing by Large-Scale Structure with the FIRST Radio Survey

摘要： 弱引力透镜引起的相干图像畸变可用于测量宇宙中密度非均匀性的功率谱。我们展示了利用FIRST射电巡天进行的正在进行的努力，该巡天目前包含超过400,000个源分布在4,200平方度内，因此为这一目的提供了独特的资源。我们在各种宇宙学模型背景下讨论了我们测量的灵敏度。然后我们讨论了系统效应的关键问题，其中最严重的是源碎片化、图像噪声相关性和VLA望远镜波束各向异性。在考虑了这些效应后，我们预计我们的实验将在0.2-20度尺度上得出弱透镜功率谱的探测结果，或者至少是一个严格的上限。 显示英文摘要

摘要： The coherent image distortions induced by weak gravitational lensing can be used to measure the power spectrum of density inhomogeneities in the universe. We present our on-going effort to detect this effect with the FIRST radio survey, which currently contains about 400,000 sources over 4,200 square degrees, and thus provides a unique resource for this purpose. We discuss the sensitivity of our measurement in the context of various cosmological models. We then discuss the crucial issue of systematic effects, the most serious of which are source fragmentation, image-noise correlation, and VLA-beam anisotropy. After accounting for these effects, we expect our experiment to yield a detection, or at least a tight upper limit, for the weak lensing power spectrum on 0.2-20 degree scales.