Dark Energy Survey Year 1: An independent E/B-mode cosmic shear analysis

Abstract

We present an independent cosmic shear analysis of the non-cosmological B-mode distortions within the public first year data from the Dark Energy Survey (DES). We find no significant detection of B-modes in a full tomographic analysis of the primary METACALIBRATION shear catalogue. This is in contrast to the secondary IM3SHAPE shear catalogue, where we detect B- modes at a significance of $\sim 3\sigma$ with a pattern that is consistent with the B-mode signature of a repeating additive shear bias across the survey. We use the COSEBIs statistic to cleanly separate the B-modes from the gravitational lensing signal (E-modes). We find good agreement between the measured E-modes and their theoretical expectation given the DES cosmological parameter constraints.

5 Pages, 2 Figures

References in corpus (6)

• The Dark Energy Survey Data Release 1
• Dark energy constraints from cosmic shear power spectra: impact of intrinsic alignments on photometric redshift requirements
• The Dark Energy Survey Image Processing Pipeline
• Consistent cosmic shear in the face of systematics: a B-mode analysis of KiDS-450, DES-SV and CFHTLenS
• Inference from the small scales of cosmic shear with current and future Dark Energy Survey data
• A New Data Compression Method and its Application to Cosmic Shear Analysis

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• Dark Energy Survey Year 3 Results: Weak Lensing Shape Catalogue
• KiDS+VIKING-450 and DES-Y1 combined: Mitigating baryon feedback uncertainty with COSEBIs
• Dark Energy Survey Year 3 results: cosmological constraints from the analysis of cosmic shear in harmonic space
• Cosmic shear power spectra in practice
• x-cut Cosmic Shear: Optimally Removing Sensitivity to Baryonic and Nonlinear Physics with an Application to the Dark Energy Survey Year 1 Shear Data
• Pure-mode correlation functions for cosmic shear and application to KiDS-1000