Cosmic Gravitational Shear from the HST Medium Deep Survey
Abstract
We present a measurement of cosmic shear on scales ranging from 10 to 2 in 347 WFPC2 images of random fields. Our result is based on shapes measured via image fitting and on a simple statistical technique; careful calibration of each step allows us to quantify our systematic uncertainties and to measure the cosmic shear down to very small angular scales. The WFPC2 images provide a robust measurement of the cosmic shear signal decreasing from 5.2% at 10 to 2.2% at 130 .
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