文章基本信息

标题：KiDS+VIKING-450 and DES-Y1 combined: Mitigating baryon feedback uncertainty with COSEBIs
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作者：Marika Asgari ; Tilman Tröster ; Catherine Heymans 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2020
卷号：634
页码：1-15
DOI：10.1051/0004-6361/201936512
语种：English
出版社：EDP Sciences
摘要：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 ofE/B-Integrals (COSEBIs). With COSEBIs, we isolated anyB-modes that have a non-cosmic shear origin and demonstrate the robustness of our cosmologicalE-mode analysis as no significantB-modes were detected. We highlight how COSEBIs are fairly insensitive to the amplitude of the non-linear matter power spectrum at highk-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 onS8 = σ8(Ωm/0.3)0.5and Ωmby 20%. By adopting a flat ΛCDM model we findS8= 0.755−0.021+0.019, which is in 3.2σtension with thePlanckLegacy analysis of the cosmic microwave background.
关键词：engravitational lensing: weakmethods: data analysismethods: statisticalsurveyscosmological parameterslarge-scale structure of Universe