Dark energy survey year 1 results: Constraining baryonic physics in the Universe-猫眼课题宝

DOI：

10.1093/mnras/stab357

发表时间：

2020-07

期刊：

Monthly Notices of the Royal Astronomical Society

影响因子：

4.8

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

Hung-Jin Huang;T. Eifler;R. Mandelbaum;G. Bernstein;Anqi Chen;A. Choi;J. García-Bellido;D. Huterer;E. Krause;E. Rozo;Sukhdeep Singh;S. Bridle;J. DeRose;J. Elvin-Poole;X. Fang;O. Friedrich;M. Gatti;E. Gaztañaga;D. Gruen;W. Hartley;B. Hoyle;M. Jarvis;N. MacCrann;V. Miranda;M. Rau;J. Prat;C. S'anchez;S. Samuroff;M. Troxel;J. Zuntz;T. Abbott;M. Aguena;J. Annis;S. Ávila;M. Becker;E. Bertin;D. Brooks;D. Burke;A. Carnero Rosell-A.-Carnero Rosell-2124071406;M. Carrasco Kind-M.-Carrasco Kind-2124064684;J. Carretero;F. Castander;L. D. da Costa-L.-D.-da Costa-2124068506;J. De Vicente-J.-De Vicente-2124230603;J. Dietrich;P. Doel;S. Everett;B. Flaugher;P. Fosalba;J. Frieman;R. Gruendl;G. Gutiérrez;S. Hinton;K. Honscheid;D. James;K. Kuehn;O. Lahav;M. Lima;M. Maia;J. Marshall;F. Menanteau;R. Miquel;F. Paz-Chinchón;A. P. Malagón;K. Romer;A. Roodman;E. Sánchez;V. Scarpine;S. Serrano;I. Sevilla;Mathew Smith;M. Soares-Santos;E. Suchyta;M. Swanson;G. Tarlé;Diehl Thomas;J. Weller

大尺度结构的测量是用物质分布的理论预测来解释的，包括重子物理的潜在影响。我们利用暗能量调查（DES）第一年的弱透镜和星系群集观测数据（3 × 2pt），结合来自重子声学振荡（BAO）和普朗克宇宙微波背景极化的外部信息，共同约束重子与宇宙学的反馈强度。我们的重子模型是由一组跨越各种重子场景的流体动力学模拟提供的；我们通过从这些模拟中提取的汇总统计数据的主成分（PC）分析来跨越这个空间。我们发现，在DES Y1约束功率水平上，一个PC足以描述观测值中重子效应的变化，并且第一个PC振幅（Q1）通常反映重子反馈的强度。由于之前Q1的上限受到Illustris反馈场景的约束，与原来的DES 3 × 2pt分析相比，$S_8=\sigma _8(\Omega _{\rm m}/0.3)^{0.5}=0.788^{+0.018}_{-0.021}$的约束得到了$\sim 20{{\ \rm per\ cent}}$的改进。这一增益是由于包含了小尺度宇宙切变信息至2.5角分，这在之前没有模拟重子物理的DES分析中被排除在外。我们获得了具有非信息性Q1先验的DES Y1+Planck EE+BAO组合分析的$S_8=0.781^{+0.014}_{-0.015}$。在重子约束方面，我们仅测量DESY1的$Q_1=1.14^{+2.20}_{-2.80}$和DESY1+Planck EE+BAO的$Q_1=1.42^{+1.63}_{-1.48}$，允许我们排除最极端的AGN反馈流体力学场景之一，超过2σ。

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 × 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 modelling 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 (Q1) generally reflects the strength of baryon feedback. With the upper limit of Q1 prior being bound by the Illustris feedback scenarios, we reach $\sim 20{{\ \rm per\ cent}}$ 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 × 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 Q1 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 2σ.

Dark energy survey year 1 results: Constraining baryonic physics in the Universe

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