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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Cosmological weak lensing with the HST GEMS survey
Monthly Notices of the Royal Astronomical Society, Volume 361, No. 1, Year 2005
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Description
We present our cosmic shear analysis of GEMS, one of the largest wide-field surveys ever undertaken by the Hubble Space Telescope. Imaged with the Advanced Camera for Surveys (ACS), GEMS spans 795 arcmin2 in the Chandra Deep Field South. We detect weak lensing by large-scale structure in high-resolution F606W GEMS data from ∼60 resolved galaxies per square arcminute. We measure the two-point shear correlation function, the top-hat shear variance and the shear power spectrum, performing an E/B mode decomposition for each statistic. We show that we are not limited by systematic errors and use our results to place joint constraints on the matter density parameter Ωm and the amplitude of the matter power spectrum σ8. We find σ8(Ωm/0.3) 0.65 = 0.68 ± 0.13 where the 1σ error includes both our uncertainty on the median redshift of the survey and sampling variance. Removing image and point spread function (PSF) distortions are crucial to all weak lensing analyses. We therefore include a thorough discussion on the degree of ACS PSF distortion and anisotropy which we characterize directly from GEMS data. Consecutively imaged over 20 d, GEMS data also allow us to investigate PSF instability over time. We find that, even in the relatively short GEMS observing period, the ACS PSF ellipticity varies at the level of a few per cent which we account for with a semi-time-dependent PSF model. Our correction for the temporal and spatial variability of the PSF is shown to be successful through a series of diagnostic tests. © 2005 RAS.
Authors & Co-Authors
Heymans, Catherine E.
Germany, Heidelberg
Max Planck Institute for Astronomy
Brown, Michael Lee
United Kingdom, Edinburgh
The University of Edinburgh
Caldwell, John A.R.
United States, Baltimore
Space Telescope Science Institute
United States, Fort Davis
University of Texas
Jahnke, Knud
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Peng, Chien Y.
United States, Baltimore
Space Telescope Science Institute
United States, Tucson
The University of Arizona
Rix, Hans Walter R.
Germany, Heidelberg
Max Planck Institute for Astronomy
Andrew Taylor, Andrew N.
United Kingdom, Edinburgh
The University of Edinburgh
Bell, Eric F.
Germany, Heidelberg
Max Planck Institute for Astronomy
Häussler, Boris
Germany, Heidelberg
Max Planck Institute for Astronomy
Jogee, Shardha
United States, Baltimore
Space Telescope Science Institute
United States, Austin
The University of Texas at Austin
McIntosh, Daniel H.
United States, Amherst
University of Massachusetts Amherst
Meisenheimer, Klauss
Germany, Heidelberg
Max Planck Institute for Astronomy
Sánchez, Sebastián F.
United States, Fort Davis
University of Texas
Somerville, Rachel S.
United States, Baltimore
Space Telescope Science Institute
Wisotzki, Lutz
United States, Fort Davis
University of Texas
Statistics
Citations: 98
Authors: 15
Affiliations: 10
Identifiers
Doi:
10.1111/j.1365-2966.2005.09152.x
ISSN:
00358711
Study Design
Cross Sectional Study
Study Approach
Quantitative