Dark Energy Survey Year 1: An independent E/B-mode cosmic shear analysis. (12th January 2019)

• Record Type: Journal Article
• Authors: Asgari, Marika; Heymans, Catherine
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 484:Number 1(2019)
• Page Start: L59
• Page End: L63
• Publication Date: 2019-01-12
• Subjects: Gravitational lensing: weak; Astronomy -- Research -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnrasl/slz006
• Languages: English
• ISSNs: 1745-3933

Abstract

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 primarymetacalibration shear catalogue. This is in contrast to the secondaryim3shape shear catalogue, where we detect B-modes at a significance of ∼3σ 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.