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CFHTLenS: cosmological constraints from a combination of cosmic shear two-point and three-point correlations

Fu, L, Kilbinger, M, Erben, T, Heymans, C, Hildebrandt, H, Hoekstra, H, Kitching, TD, Mellier, Y, Miller, L, Semboloni, E, Simon, P, Van Waerbeke, L, Coupon, J, Harnois-Déraps, J, Hudson, MJ, Kuijken, K, Rowe, B, Schrabback, T, Vafaei, S and Velander, M (2014) CFHTLenS: cosmological constraints from a combination of cosmic shear two-point and three-point correlations. Monthly Notices of the Royal Astronomical Society, 441 (3). pp. 2725-2743. ISSN 0035-8711

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Higher order, non-Gaussian aspects of the large-scale structure carry valuable information on structure formation and cosmology, which is complementary to second-order statistics. In this work, we measure second- and third-order weak-lensing aperture-mass moments from the Canada–France–Hawaii Lensing Survey (CFHTLenS) and combine those with cosmic microwave background (CMB) anisotropy probes. The third moment is measured with a significance of 2σ. The combined constraint on Σ8 = σ8(Ωm/0.27)α is improved by 10 per cent, in comparison to the second-order only, and the allowed ranges for Ωm and σ8 are substantially reduced. Including general triangles of the lensing bispectrum yields tighter constraints compared to probing mainly equilateral triangles. Second- and third-order CFHTLenS lensing measurements improve Planck CMB constraints on Ωm and σ8 by 26 per cent for flat Λ cold dark matter. For a model with free curvature, the joint CFHTLenS–Planck result is Ωm = 0.28 ± 0.02 (68 per cent confidence), which is an improvement of 43 per cent compared to Planck alone. We test how our results are potentially subject to three astrophysical sources of contamination: source-lens clustering, the intrinsic alignment of galaxy shapes, and baryonic effects. We explore future limitations of the cosmological use of third-order weak lensing, such as the non-linear model and the Gaussianity of the likelihood function.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
Date Deposited: 24 Jul 2020 11:27
Last Modified: 04 Sep 2021 06:55
DOI or ID number: 10.1093/mnras/stu754
URI: https://researchonline.ljmu.ac.uk/id/eprint/13372
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