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

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## 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.
Original language English L59–L63 5 Monthly Notices of the Royal Astronomical Society: Letters 484 1 12 Jan 2019 https://doi.org/10.1093/mnrasl/slz006 Published - Mar 2019

• astro-ph.CO

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• ### GLOBE: Global Lensing Observations to go Beyond Einstein (027451/1)

Heymans, C.

EU government bodies

1/11/1531/10/21

Project: Research