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3D cosmic shear: cosmology from CFHTLenS

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Title: 3D cosmic shear: cosmology from CFHTLenS
Authors: Kitching, TD
Heavens, AF
Alsing, J
Erben, T
Heymans, C
Hildebrandt, H
Hoekstra, H
Jaffe, A
Kiessling, A
Mellier, Y
Miller, L
Van Waerbeke, L
Benjamin, J
Coupon, J
Fu, L
Hudson, MJ
Kilbinger, M
Kuijken, K
Rowe, BTP
Schrabback, T
Semboloni, E
Velander, M
Item Type: Journal Article
Abstract: This paper presents the first application of 3D cosmic shear to a wide-field weak lensing survey. 3D cosmic shear is a technique that analyses weak lensing in three dimensions using a spherical harmonic approach, and does not bin data in the redshift direction. This is applied to CFHTLenS, a 154 square degree imaging survey with a median redshift of 0.7 and an effective number density of 11 galaxies per square arcminute usable for weak lensing. To account for survey masks we apply a 3D pseudo-Cℓ approach on weak lensing data, and to avoid uncertainties in the highly non-linear regime, we separately analyse radial wavenumbers k ≤ 1.5 and 5.0 h Mpc−1, and angular wavenumbers ℓ ≈ 400–5000. We show how one can recover 2D and tomographic power spectra from the full 3D cosmic shear power spectra and present a measurement of the 2D cosmic shear power spectrum, and measurements of a set of 2-bin and 6-bin cosmic shear tomographic power spectra; in doing so we find that using the 3D power in the calculation of such 2D and tomographic power spectra from data naturally accounts for a minimum scale in the matter power spectrum. We use 3D cosmic shear to constrain cosmologies with parameters ΩM, ΩB, σ8, h , ns, w0 and wa. For a non-evolving dark energy equation of state, and assuming a flat cosmology, lensing combined with Wilkinson Microwave Anisotropy Probe 7 results in h = 0.78 ± 0.12, ΩM = 0.252 ± 0.079, σ8 = 0.88 ± 0.23 and w = −1.16 ± 0.38 using only scales k ≤ 1.5  h Mpc−1. We also present results of lensing combined with first year Planck results, where we find no tension with the results from this analysis, but we also find no significant improvement over the Planck results alone. We find evidence of a suppression of power compared to Lambda cold dark matter (LCDM) on small scales 1.5 < k ≤ 5.0 h Mpc−1 in the lensing data, which is consistent with predictions of the effect of baryonic feedback on the matter power spectrum.
Issue Date: 1-Aug-2014
Date of Acceptance: 8-May-2014
URI: http://hdl.handle.net/10044/1/19689
DOI: 10.1093/mnras/stu934
ISSN: 0035-8711
Publisher: Oxford University Press
Start Page: 1326
End Page: 1349
Journal / Book Title: Monthly Notices of the Royal Astronomical Society
Volume: 442
Issue: 2
Copyright Statement: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Imperial College Trust
Science and Technology Facilities Council [2006-2012]
Funder's Grant Number: ST/K001051/1
N/A
ST/K001051/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
gravitational lensing: weak
cosmological parameters
GALAXY SHAPE MEASUREMENT
WEAK LENSING SURVEYS
HUBBLE-SPACE-TELESCOPE
MATTER POWER SPECTRUM
DARK ENERGY
INTRINSIC ALIGNMENTS
HALO MODEL
CONSTRAINTS
PRECISION
BARYONS
Science & Technology
Physical Sciences
Astronomy & Astrophysics
gravitational lensing: weak
cosmological parameters
GALAXY SHAPE MEASUREMENT
WEAK LENSING SURVEYS
HUBBLE-SPACE-TELESCOPE
MATTER POWER SPECTRUM
DARK ENERGY
INTRINSIC ALIGNMENTS
HALO MODEL
CONSTRAINTS
PRECISION
BARYONS
Astronomy & Astrophysics
0201 Astronomical and Space Sciences
Publication Status: Published
Online Publication Date: 2014-06-11
Appears in Collections:Physics
Astrophysics
Faculty of Natural Sciences