Cosmic Shear with Keck: Systematic Effects

Details Cosmic Shear with Keck: Systematic Effects Cosmic Shear with Keck: Systematic Effects

2001-12-17

arxiv.org/abs/astro-ph/0112393v1

Astronomy and Astrophysics

Astrophysics

2 pages. To appear in "A New Era in Cosmology", (ASP Conference Proceedings), eds. T. Shanks and N. Metcalfe

Scientific paper

Cosmic shear probes the distribution of dark matter via gravitational lensing of distant, background galaxies. We describe our cosmic shear survey consisting of deep blank fields observed with the Keck II telescope. We have found biases in the standard weak lensing analysis, which are enhanced by the elongated geometry of the Keck fields. We show how these biases can be diagnosed and corrected by masking edges and chip defects.

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