Cosmic gravitational shear from the HST Medium Deep survey
Nov, 2003
4 pages
Published in:
- Astrophys.J.Lett. 598 (2003) L71-L74
e-Print:
- astro-ph/0311328 [astro-ph]
DOI:
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Abstract: (arXiv)
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 .References(24)
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