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An enlarged cosmic shear survey with the William Herschel Telescope

Massey, Richard and Refregier, Alexandre and Bacon, David J. and Ellis, Richard and Brown, Michael L. (2005) An enlarged cosmic shear survey with the William Herschel Telescope. Monthly Notices of the Royal Astronomical Society, 359 (4). pp. 1277-1286. ISSN 0035-8711.

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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 deg^2. 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/Ω_m)^(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.

Item Type:Article
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URLURL TypeDescription Paper
Ellis, Richard0000-0001-7782-7071
Additional Information:© 2005 RAS. Accepted 2005 March 10. Received 2005 February 17; in original form 2004 April 15. We thank Neil O'Mahony, Chris Benn and the WHT staff for their help with the observations. We thank Nick Kaiser for providing us with the IMCAT software, and to Douglas Clowe for advice on its use. We thank Sarah Bridle, Catherine Heymans and Jason Rhodes for useful discussions. We thank the anonymous referee for helpful suggestions to improve the text and to clarify various discussions. DB and MB were supported by PPARC post-doctoral fellowships.
Funding AgencyGrant Number
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Subject Keywords:gravitational lensing, cosmology: observations, large-scale structure of Universe
Issue or Number:4
Record Number:CaltechAUTHORS:20170408-201811962
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Official Citation:Richard Massey, Alexandre Refregier, David J. Bacon, Richard Ellis, Michael L. Brown; An enlarged cosmic shear survey with the William Herschel Telescope, Monthly Notices of the Royal Astronomical Society, Volume 359, Issue 4, 1 June 2005, Pages 1277–1286,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76382
Deposited By: 1Science Import
Deposited On:30 Mar 2018 22:16
Last Modified:03 Oct 2019 17:00

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