Cooray A, Hu W, Miralda-Escudé J
Astrophys J. 2000 May 20;535(1):L9-L12. doi: 10.1086/312696.
Weak gravitational lensing observations probe the spectrum and evolution of density fluctuations and the cosmological parameters that govern them, but they are currently limited to small fields and subject to selection biases. We show how the expected signal from large-scale structure arises from the contributions from and correlations between individual halos. We determine the convergence power spectrum as a function of the maximum halo mass and so provide the means to interpret results from surveys that lack high-mass halos either through selection criteria or small fields. Since shot noise from rare massive halos is mainly responsible for the sample variance below 10&arcmin;, our method should aid our ability to extract cosmological information from small fields.
弱引力透镜观测探测密度涨落的频谱和演化以及支配它们的宇宙学参数，但目前它们仅限于小视场且存在选择偏差。我们展示了来自大尺度结构的预期信号是如何由各个晕的贡献及其之间的相关性产生的。我们确定了作为最大晕质量函数的收敛功率谱，从而提供了一种方法来解释那些由于选择标准或小视场而缺乏高质量晕的 surveys 的结果。由于来自罕见大质量晕的散粒噪声主要导致了低于 10 角分的样本方差，我们的方法应该有助于我们从小视场中提取宇宙学信息的能力。
