Wide Field Observations of Weak Gravitatinal Lensing Using the UH 8192x8192 CCD Mosaic Camera

AST95-29274 PI：利用UH8192x8192ccd马赛克相机的Gerard Luppino弱引力透镜广域观测拟议的观测资金旨在利用弱引力透镜绘制星系团和更大尺度上的暗物质图。该项目将利用一种专门为透镜研究制造的仪器的独特途径：新的UH 8192x8192 CCD马赛克相机。马赛克是紧密排列的4x2 LCD阵列，像素为15微米，提供0.47°宽的视场。观察将集中在两个方面。第一种是获得红移在0.1到1之间的星系团的广域图像，从而探测大半径的星系团暗物质轮廓。对于具有巨大弧线的两个星系团，如果现有的HST图像可用，质量轮廓重建将延伸到核心，为帮助区分各种暗物质模型提供证据。第二个观测方案是覆盖10度平方区域的V和I两种颜色的深度调查，以寻找宇宙大尺度结构的弱透镜，并直接测量质量功率谱P(K)。到目前为止，这种搜索一直受到可用视野狭窄的严重限制。这台仪器将在三年内测量100-200万个星系的位置、形状、大小和颜色。

AST 95-29274 PI: Gerard Luppino Wide Field Observations of Weak Gravitational Lensing Using the UH 8192 x 8192 CCD Mosaic Camera The proposed observational funding is aimed at mapping dark matter on cluster and larger scales using weak gravitational lensing. The program will exploit unique access to an instrument built specifically for lensing studies: the new UH 8192x8192 CCD mosaic camera.. The mosaic is a close-packed 4x2 array of CCDs with 15 um pixels providing a 0.47 deg wide field of view. The observations will concentrate on two areas. The first is to obtain wide field images of clusters of galaxies spanning redshifts between 0.1 and 1, thus probing cluster dark matter profiles at large radii. For two clusters with giant arcs, for which an existing HST image is available, the mass profile reconstruction will be extended into the core, providing evidence to help distinguish between various dark matter models. The second observational program is a deep survey in two colors, V and I, covering a 10 degree-squared area, to search for weak lensing by the large scale structure of the universe, and directly measure the mass power spectrum P(k). Such searches have been severely limited by the narrow fields of view available until now. This instrument should measure positions, shapes, magnitudes and colors of ~1-2 million galaxies in three years.