CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics

Joudaki, Shahab, Blake, Chris, Heymans, Catherine, Choi, Ami, Harnois-Deraps, Joachim, Hildebrandt, Hendrik, Joachimi, Benjamin, Johnson, Andrew, Mead, Alexander, Parkinson, David, Viola, Massimo and van Waerbeke, Ludovic (2017) CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics. Monthly Notices of the Royal Astronomical Society, 465 2: 2033-2052. doi:10.1093/mnras/stw2665

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Author Joudaki, Shahab
Blake, Chris
Heymans, Catherine
Choi, Ami
Harnois-Deraps, Joachim
Hildebrandt, Hendrik
Joachimi, Benjamin
Johnson, Andrew
Mead, Alexander
Parkinson, David
Viola, Massimo
van Waerbeke, Ludovic
Title CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
1365-2966
Publication date 2017-02-01
Year available 2016
Sub-type Article (original research)
DOI 10.1093/mnras/stw2665
Open Access Status File (Publisher version)
Volume 465
Issue 2
Start page 2033
End page 2052
Total pages 20
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2018
Language eng
Abstract We investigate the impact of astrophysical systematics on cosmic shear cosmological parameter constraints from the Canada–France–Hawaii Telescope Lensing Survey (CFHTLenS) and the concordance with cosmic microwave background measurements by Planck. We present updated CFHTLenS cosmic shear tomography measurements extended to degree scales using a covariance calibrated by a new suite of N-body simulations. We analyse these measurements with a new model fitting pipeline, accounting for key systematic uncertainties arising from intrinsic galaxy alignments, baryonic effects in the non-linear matter power spectrum, and photometric redshift uncertainties. We examine the impact of the systematic degrees of freedom on the cosmological parameter constraints, both independently and jointly. When the systematic uncertainties are considered independently, the intrinsic alignment amplitude is the only degree of freedom that is substantially preferred by the data. When the systematic uncertainties are considered jointly, there is no consistently strong preference in favour of the more complex models. We quantify the level of concordance between the CFHTLenS and Planck data sets by employing two distinct data concordance tests, grounded in Bayesian evidence and information theory. We find that the two data concordance tests largely agree with one another and that the level of concordance between the CFHTLenS and Planck data sets is sensitive to the exact details of the systematic uncertainties included in our analysis, ranging from decisive discordance to substantial concordance as the treatment of the systematic uncertainties becomes more conservative. The least conservative scenario is the one most favoured by the cosmic shear data, but it is also the one that shows the greatest degree of discordance with Planck. The data and analysis code are publicly available at https://github.com/sjoudaki/cfhtlens_revisited.
Keyword Gravitational lensing: weak
Surveys
Cosmology: theory
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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