论文标题
结合宇宙场中强和弱透镜估计值
Combining strong and weak lensing estimates in the Cosmos field
论文作者
论文摘要
我们提供了对宇宙场中强烈镜头扩展的弧形和星系形测量的视线扭曲的建模的组合宇宙剪切分析。我们开发一个框架，以根据小规模物质功率光谱来预测宇宙剪切强镜头和星系形状测量的协方差。使用超快速图像发生器UFIG校准的COSMOS调查中的数据进行弱透镜测量（Berge 2013）。通过从同一哈勃空间望远镜成像数据集的主透镜偏转器和外部剪切组件将镜头弧进行转发模拟镜头弧来进行强镜头分析。通过三个强透镜剪切测量的样品，我们提出了沿着相同视线的两个互补测量值之间的2 sigma检测。有了大量的镜头样品，下一代地面和基于空间的观测值，带有大量镜片样本的两个探针的信号的协方差可以进行系统的检查，对两个测量值的交叉校准以及小规模剪切功率光谱的测量。
We present a combined cosmic shear analysis of the modeling of line-of-sight distortions on strongly lensed extended arcs and galaxy shape measurements in the COSMOS field. We develop a framework to predict the covariance of strong lensing and galaxy shape measurements of cosmic shear on the basis of the small scale matter power-spectrum. The weak lensing measurement is performed using data from the COSMOS survey calibrated with a cloning scheme using the Ultra Fast Image Generator UFig (Berge 2013). The strong lensing analysis is performed by forward modeling the lensing arcs with a main lensing deflector and external shear components from the same Hubble Space Telescope imaging data set. With a sample of three strong lensing shear measurements we present a 2-sigma detection of the cross-correlation signal between the two complementary measurements of cosmic shear along the identical line of sight. With large samples of lenses available with the next generation ground and space based observatories, the covariance of the signal of the two probes with large samples of lenses allows for systematic checks, cross-calibration of either of the two measurement and the measurement of the small scale shear power-spectrum.
