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We investigate the impact of astrophysical systematics on cosmic shearcosmological parameter constraints from the Canada-France-Hawaii TelescopeLensing Survey (CFHTLenS), and the concordance with cosmic microwave backgroundmeasurements by Planck. We present updated CFHTLenS cosmic shear tomographymeasurements extended to degree scales using a covariance calibrated by a newsuite of N-body simulations. We analyze these measurements with a new modelfitting pipeline, accounting for key systematic uncertainties arising fromintrinsic galaxy alignments, baryonic effects in the nonlinear matter powerspectrum, and photometric redshift uncertainties. We examine the impact of thesystematic degrees of freedom on the cosmological parameter constraints, bothindependently and jointly. When the systematic uncertainties are consideredindependently, the intrinsic alignment amplitude is the only degree of freedomthat is substantially preferred by the data. When the systematic uncertaintiesare considered jointly, there is no consistently strong preference in favor ofthe more complex models. We quantify the level of concordance between theCFHTLenS and Planck datasets by employing two distinct data concordance tests,grounded in Bayesian evidence and information theory. We find that the two dataconcordance tests largely agree with one another, and that the level ofconcordance between the CFHTLenS and Planck datasets is sensitive to the exactdetails of the systematic uncertainties included in our analysis, ranging fromdecisive discordance to substantial concordance as the treatment of thesystematic uncertainties becomes more conservative. The least conservativescenario is the one most favored by the cosmic shear data, but it is also theone that shows the greatest degree of discordance with Planck. The data andanalysis code are public at https://github.com/sjoudaki/cfhtlens_revisited

CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics