Joint cosmic shear measurements with the Keck and William Herschel Telescopes
Abstract
The recent measurements of weak lensing by largescale structure present significant new opportunities for studies of the matter distribution in the Universe. Here, we present a new cosmic shear survey carried out with the Echelle Spectrograph and Imager on the Keck II telescope. This covers a total of 0.6 square degrees in 173 fields probing independent lines of sight, hence minimizing the impact of sample variance. We also extend our measurements of cosmic shear with the William Herschel Telescope (Bacon, Refregier & Ellis 2000) to a survey area of 1 square degree. The joint measurements with two independent telescopes allow us to assess the impact of instrumentspecific systematics, one of the major difficulties in cosmic shear measurements. For both surveys, we account for effects such as smearing by the point spread function and shearing due to telescope optics carefully. We find negligible residuals in both cases and recover mutually consistent cosmic shear signals, significant at the 5.1σ level. We present a simple method to compute the statistical error in the shear correlation function, including nonGaussian sample variance and the covariance between different angular bins. We measure shear correlation functions for all fields and use these to ascertain the amplitude of the matter power spectrum, finding σ_{8}(Ω_{m}/0.3)^{0.68}= 0.97 +/ 0.13 with 0.14 < Ω_{m} < 0.65 in a Λ cold dark matter (ΛCDM) model with Γ= 0.21. These 68 per cent confidence level uncertainties include sample variance, statistical noise, redshift uncertainty and the error in the shear measurement method. The results from our two independent surveys are both consistent with measurements of cosmic shear from other groups. We discuss how our results compare with current normalization from cluster abundance.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 September 2003
 DOI:
 10.1046/j.13658711.2003.06877.x
 arXiv:
 arXiv:astroph/0203134
 Bibcode:
 2003MNRAS.344..673B
 Keywords:

 gravitational lensing;
 cosmology: observations;
 largescale structure of Universe;
 Astrophysics
 EPrint:
 13 LaTex pages, including 17 figures, submitted to MNRAS. Includes updated figures 1 &