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An enlarged cosmic shear survey with the William Herschel Telescope

Massey, R.; Refregier, A.; Bacon, D.J.; Ellis, R.; Brown, M.L.

An enlarged cosmic shear survey with the William Herschel Telescope Thumbnail


A. Refregier

D.J. Bacon

R. Ellis

M.L. Brown


We report the results of a cosmic shear survey using the 4.2-m William Herschel Telescope on La Palma, to a depth of R = 25.8 (z ≈ 0.8), over 4 deg2. The shear correlation functions are measured on scales from 1 to 15 arcmin, and are used to constrain cosmological parameters. We ensure that our measurements are free from instrumental systematic effects by performing a series of tests, including a decomposition of the signal into E- and B-modes. We also reanalyse the data independently, using the shear measurement pipeline developed for the COMBO-17 survey. This confirms our results and also highlights various effects introduced by different implementations of the basic ‘Kaiser—Squires—Broadhurst’ shear measurement method. We find that the normalization of the matter power spectrum on 8 h−1 Mpc scales is σ8 = (1.02 ± 0.15)(0.3/Ωm)1/2, where the 68 per cent confidence limit error includes noise, sample variance, covariance between angular scales, systematic effects, redshift uncertainty and marginalization over other parameters. We compare these results with other cosmic shear surveys and with recent constraints from the Wilkinson Microwave Anisotropy Probe experiment.


Massey, R., Refregier, A., Bacon, D., Ellis, R., & Brown, M. (2005). An enlarged cosmic shear survey with the William Herschel Telescope. Monthly Notices of the Royal Astronomical Society, 359(4), 1277-1286.

Journal Article Type Article
Publication Date Jun 1, 2005
Deposit Date Mar 21, 2013
Publicly Available Date Feb 20, 2015
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 359
Issue 4
Pages 1277-1286
Keywords Gravitational lensing, Cosmology: observations, Large-scale structure of Universe.


Published Journal Article (417 Kb)

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2005 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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