Detection of Cosmic Shear with the William Herschel Telescope

Details Detection of Cosmic Shear with the William Herschel Telescope Detection of Cosmic Shear with the William Herschel Telescope

2000-08-16

arxiv.org/abs/astro-ph/0008248v1

Astronomy and Astrophysics

Astrophysics

4 pages, including 3 figures. To appear in Proceedings of XXth Moriond Astrophysics Meeting, "Cosmological Physics with Gravit

Scientific paper

Gravitational lensing by large-scale structure induces weak coherent alignments in the shapes of background galaxies. Here we present evidence for the detection of this `cosmic shear' at the 3.4 sigma significance level with the William Herschel Telescope. Analysis and removal of notable systematic effects, such as shear induced by telescope optics and smearing by tracking and seeing, are conducted in order to recover the physical weak shear signal. Positive results for shear recovery on realistic simulated data are presented, enhancing confidence in the measurement method. The detection of cosmic shear is statistically characterised, and its cosmological significance is discussed.

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