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Dark Energy Survey Year 1 Results: Constraining Baryonic Physics in the Universe
- Source :
- Mon.Not.Roy.Astron.Soc., Mon.Not.Roy.Astron.Soc., 2021, 502 (4), pp.6010-6031. ⟨10.1093/mnras/stab357⟩, Biblos-e Archivo. Repositorio Institucional de la UAM, instname, Digital.CSIC. Repositorio Institucional del CSIC
- Publication Year :
- 2020
- Publisher :
- arXiv, 2020.
-
Abstract
- Measurements of large-scale structure are interpreted using theoretical predictions for the matter distribution, including potential impacts of baryonic physics. We constrain the feedback strength of baryons jointly with cosmology using weak lensing and galaxy clustering observables (3$\times$2pt) of Dark Energy Survey (DES) Year 1 data in combination with external information from baryon acoustic oscillations (BAO) and Planck cosmic microwave background polarization. Our baryon modeling is informed by a set of hydrodynamical simulations that span a variety of baryon scenarios; we span this space via a Principal Component (PC) analysis of the summary statistics extracted from these simulations. We show that at the level of DES Y1 constraining power, one PC is sufficient to describe the variation of baryonic effects in the observables, and the first PC amplitude ($Q_1$) generally reflects the strength of baryon feedback. With the upper limit of $Q_1$ prior being bound by the Illustris feedback scenarios, we reach $\sim 20\%$ improvement in the constraint of $S_8=\sigma_8(\Omega_{\rm m}/0.3)^{0.5}=0.788^{+0.018}_{-0.021}$ compared to the original DES 3$\times$2pt analysis. This gain is driven by the inclusion of small-scale cosmic shear information down to 2.5 arcmin, which was excluded in previous DES analyses that did not model baryonic physics. We obtain $S_8=0.781^{+0.014}_{-0.015}$ for the combined DES Y1+Planck EE+BAO analysis with a non-informative $Q_1$ prior. In terms of the baryon constraints, we measure $Q_1=1.14^{+2.20}_{-2.80}$ for DES Y1 only and $Q_1=1.42^{+1.63}_{-1.48}$ for DESY1+Planck EE+BAO, allowing us to exclude one of the most extreme AGN feedback hydrodynamical scenario at more than $2 \sigma$.<br />Comment: 22 pages, 18 figures, 2 tables. accepted to MNRAS. A brief video summary of this paper is available at https://www.youtube.com/watch?v=QbeNwk5papU
- Subjects :
- Particle physics
Large-Scale Structure of Universe
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cosmic microwave background
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
7. Clean energy
01 natural sciences
Cosmology
symbols.namesake
cosmology: theory
0103 physical sciences
Planck
cosmological parameters
010303 astronomy & astrophysics
Weak gravitational lensing
Physics
010308 nuclear & particles physics
Física
Astronomy and Astrophysics
Galaxy
Baryon
13. Climate action
Space and Planetary Science
symbols
Dark energy
Theory [Cosmology]
Cosmological Parameters
Baryon acoustic oscillations
large-scale structure of Universe
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Mon.Not.Roy.Astron.Soc., Mon.Not.Roy.Astron.Soc., 2021, 502 (4), pp.6010-6031. ⟨10.1093/mnras/stab357⟩, Biblos-e Archivo. Repositorio Institucional de la UAM, instname, Digital.CSIC. Repositorio Institucional del CSIC
- Accession number :
- edsair.doi.dedup.....aa261a069de8962eb40f0c24b27bb6f3
- Full Text :
- https://doi.org/10.48550/arxiv.2007.15026