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

Oct 11, 2019
15 pages
Published in:
  • Astron.Astrophys. 634 (2020) A127
  • Published: Feb 1, 2020
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Abstract: (EDP Sciences)
We present cosmological constraints from a joint cosmic shear analysis of the Kilo-Degree Survey (KV450) and the Dark Energy Survey (DES-Y1), which were conducted using Complete Orthogonal Sets of E/B-Integrals (COSEBIs). With COSEBIs, we isolated any B-modes that have a non-cosmic shear origin and demonstrate the robustness of our cosmological E-mode analysis as no significant B-modes were 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, allowed us to utilise additional small-scale information, improving the DES-Y1 joint constraints on S8 = σ8(Ωm/0.3)0.5 and Ωm by 20%. By adopting a flat ΛCDM model we find S8 = 0.755−0.021+0.019, which is in 3.2σ tension with the Planck Legacy analysis of the cosmic microwave background.Key words: gravitational lensing: weak / methods: data analysis / methods: statistical / surveys / cosmological parameters / large-scale structure of Universe
Note:
  • Accepted for publication in A&A. 15 pages, 7 figures
  • gravitational lensing: weak
  • methods: data analysis
  • methods: statistical
  • surveys
  • cosmological parameters
  • large-scale structure of Universe