弱引力透镜

The Dark Energy Survey Pub Date : 2020-09-01 DOI:10.1142/9781786348364_0012

D. Gruen, B. Jain, M. Troxel

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摘要

1•前景质量可以放大和扭曲背景源•微弱的高z星系提供了透镜质量投射的“宇宙墙纸”-即使是适度的红移也有~ 50个星系/arcmin2。HST最深的调查显示~ 100/arcmin2。•源的大小是未知的，但我们可以计算一个平均形状的非透镜场样本，并假设随机方向•为了简单，让我们假设平均形状是半径为q的圆形。

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Weak Gravitational Lensing

1 • Foreground Masses Can Magnify and Distort Background Sources • Faint, High-z Galaxies Provide a “Cosmic Wallpaper” Upon Which the Lensing Mass is Projected – At even modest redshifts there are ~ 50 galaxies/arcmin2. The deepest surveys with HST reveal ~ 100/arcmin2. • Source Sizes Are Unknown but We can Compute an Average Shape for Un-lensed Field Samples and Assume Random Orientations • For Simplicity Let’s Assume Average Shape is Circular with Radius q. For a Weakly Lensed Background Source:

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