摘要:
   弱引力透镜效应作为一种近乎无模型依赖的宇宙学探针，其精确测量以及相应的宇宙学应用已经成为所有国际上第四代图像巡天的主要科学目标之一。在过去的若干年中，我们致力于Fourier_Quad这种新颖的测量方法，解决了一系列形状测量和图像处理中的瓶颈问题，包括点扩散函数修正、噪声处理、像场畸变测量、统计方法优化等。目前已经基本建成一条完整的图像处理管线，且成功应用于CFHTLenS、DECaLS、HSC等观测数据的处理上，产生了超过10000平方度天区的剪切信号目录。目前该目录已经公开，供国内外同行使用。我们也基于该目录以及DECaLS星系群表研究了若干暗物质晕的物理性质，并且初步对宇宙学参数做出了独立的限制。    

   Weak gravitational lensing is an almost model-independent cosmic probe. Its accurate measurement and cosmological applications have become one of the main scientific objectives of all the stage IV imaging surveys in the world. In the past many years, we have been focusing on developing a novel shear measurement method called Fourier_Quad. In doing so, we have solved a number of bottleneck problems in shape measurement and image analysis, including correction for the point spread function, dealing with the noise, measuring the field distortion, optimize the statistical method, etc.. By now, we have basically finished building a complete image processing pipeline, which has been successfully applied to the observational data of CFHTLenS, DECaLS, HSC, and produced shear catalogs covering more than 10000 square degrees. The catalogs are now open to the public. Using these data, as well as the galaxy group catalogs from DECaLS, we have studied a number of physical properties of dark matter halos. We have also made some preliminary constraints on the cosmological parameters independently.