Cosmic Gravitational Shear from the HST Medium Deep Survey

Abstract

We present a measurement of cosmic shear on scales ranging from $ 10\arcsec $ to $ 2\arcmin $ 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\arcsec $ to $2.2$ at $ 130\arcsec $.

4 pages 2 Postscript figures, uses emulateapj.cls Astrophysical Journal Letters, December 1, 2003

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• Cosmic Gravitational Shear from the HST Medium Deep Survey
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• A new weak lensing shear analysis method using ellipticity defined by 0th order moments