KiDS+VIKING-450 and DES-Y1 combined: Mitigating baryon feedback uncertainty with COSEBIs

Marika Asgari, Tilman Tröster, Catherine Heymans, Hendrik Hildebrandt, Jan Luca van den Busch, Angus H. Wright, Ami Choi, Thomas Erben, Benjamin Joachimi, Shahab Joudaki, Arun Kannawadi, Konrad Kuijken, Chieh-An Lin, Peter Schneider, Joe Zuntz

Research output: Contribution to journalArticlepeer-review


We present cosmological constraints from a joint cosmic shear analysis of the Kilo-Degree Survey (KV450) and the Dark Energy Survey (DES-Y1), conducted using Complete Orthogonal Sets of E/B-Integrals (COSEBIs). With COSEBIs we isolate any B-modes which have a non-cosmic shear origin and demonstrate the robustness of our cosmological E-mode analysis as no significant B-modes are detected. We highlight how COSEBIs are fairly insensitive to the amplitude of the non-linear matter power spectrum at high k-scales, mitigating the uncertain impact of baryon feedback in our analysis. COSEBIs, therefore, allow us to utilise additional small-scale information, improving the DES-Y1 joint constraints on S 8 = σ8(Ωm/0:3)0:5 and Ωm by 20%. Adopting a flat CDM model we find S 8 = 0:755+0:019-0:021, which is in 3:2σ tension with the Planck Legacy analysis of the cosmic microwave background.
Original languageEnglish
Article numberA127
Number of pages15
JournalAstronomy & Astrophysics
Publication statusPublished - 24 Feb 2020


  • astro-ph.CO


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