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

doi:10.1051/0004-6361/201936512

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

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

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 language	English
Article number	A127
Number of pages	15
Journal	Astronomy & Astrophysics
Volume	634
DOIs	https://doi.org/10.1051/0004-6361/201936512
Publication status	Published - 24 Feb 2020

Keywords / Materials (for Non-textual outputs)

astro-ph.CO

Access to Document

10.1051/0004-6361/201936512

1910.05336Accepted author manuscript, 2.61 MB

https://www.aanda.org/articles/aa/abs/2020/02/aa36512-19/aa36512-19.html

GLOBE: Global Lensing Observations to go Beyond Einstein (027451/1)
Heymans, C.
EU government bodies
1/11/15 → 31/10/21
Project: Research

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Asgari, M., Tröster, T., Heymans, C., Hildebrandt, H., Busch, J. L. V. D., Wright, A. H., Choi, A., Erben, T., Joachimi, B., Joudaki, S., Kannawadi, A., Kuijken, K., Lin, C.-A., Schneider, P., & Zuntz, J. (2020). KiDS+VIKING-450 and DES-Y1 combined: Mitigating baryon feedback uncertainty with COSEBIs. Astronomy & Astrophysics, 634, Article A127. https://doi.org/10.1051/0004-6361/201936512

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

abstract = "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.",

keywords = "astro-ph.CO",

author = "Marika Asgari and Tilman Tr{\"o}ster and Catherine Heymans and Hendrik Hildebrandt and Busch, {Jan Luca van den} and Wright, {Angus H.} and Ami Choi and Thomas Erben and Benjamin Joachimi and Shahab Joudaki and Arun Kannawadi and Konrad Kuijken and Chieh-An Lin and Peter Schneider and Joe Zuntz",

note = "Accepted for publication in A&A. 15 pages, 7 figures",

year = "2020",

month = feb,

day = "24",

doi = "10.1051/0004-6361/201936512",

language = "English",

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TY - JOUR

T1 - KiDS+VIKING-450 and DES-Y1 combined:

T2 - Mitigating baryon feedback uncertainty with COSEBIs

AU - Asgari, Marika

AU - Tröster, Tilman

AU - Heymans, Catherine

AU - Hildebrandt, Hendrik

AU - Busch, Jan Luca van den

AU - Wright, Angus H.

AU - Choi, Ami

AU - Erben, Thomas

AU - Joachimi, Benjamin

AU - Joudaki, Shahab

AU - Kannawadi, Arun

AU - Kuijken, Konrad

AU - Lin, Chieh-An

AU - Schneider, Peter

AU - Zuntz, Joe

N1 - Accepted for publication in A&A. 15 pages, 7 figures

PY - 2020/2/24

Y1 - 2020/2/24

N2 - 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.

AB - 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.

KW - astro-ph.CO

U2 - 10.1051/0004-6361/201936512

DO - 10.1051/0004-6361/201936512

M3 - Article

SN - 0004-6361

VL - 634

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A127

ER -

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

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

Cite this