反馈与宇宙学对宇宙红外背景交叉相关的影响
The impact of feedback and cosmology on Cosmic Infrared Background cross-correlations
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中文总结 AI 辅助
本研究利用FLAMINGO模拟和CIB交叉相关，发现强恒星反馈及强动能AGN反馈模型被观测数据排除，展示了CIB交叉相关约束星系形成物理的潜力。
中文摘要 AI 辅助
我们研究了FLAMINGO流体动力学模拟套件中恒星形成率密度（SFR）$\rho_{\rm SFR}$的演化与成团特性，旨在探索利用宇宙红外背景（CIB）与大尺度结构其他示踪体之间的交叉相关来约束AGN和恒星反馈方案以及宇宙学效应的可能性。具体而言，我们考虑了偏置加权恒星形成率密度$\langle b\rho_{\rm SFR}\rangle$的层析测量，以及CIB与宇宙剪切之间的交叉相关，作为$\rho_{\rm SFR}$-物质相关的探针。大多数针对$z=0$星系恒星质量函数（SMF）校准的FLAMINGO模型对恒星形成系统的分布和成团性给出了相似的预测，因此难以就AGN反馈或宇宙学对CIB统计的影响得出清晰结论。然而，我们表明，当前对$\langle b\rho_{\rm SFR}\rangle$的测量以及CIB-剪切交叉相关明显不利于具有强恒星反馈的模型，也不利于具有强动能（喷流驱动）AGN反馈的模拟，即使在基准SMF校准下也是如此。这项研究展示了CIB交叉相关在宇宙学背景下研究恒星和星系形成物理方面的潜力。
英文摘要
We study the evolution and clustering properties of the star formation rate density (SFR) $ρ_{\rm SFR}$ in the FLAMINGO suite of hydrodynamical simulations, with the aim of exploring the possibility of constraining AGN and stellar feedback prescription, as well as the effect of cosmology, using cross-correlations between the Cosmic Infrared Background (CIB) and other tracers of the large-scale structure. Specifically, we consider tomographic measurements of the bias-weighted SFR-density $\langle bρ_{\rm SFR}\rangle$, as well as cross-correlations between the CIB and cosmic shear as a probe of the $ρ_{\rm SFR}$-matter correlation. Most of the FLAMINGO models calibrated against the $z=0$ galaxy stellar mass function (SMF) yield similar predictions for the distribution and clustering of star-forming systems, and thus it is difficult to derive clean conclusions regarding the impact of AGN feedback or cosmology on CIB statistics. However, we show that current measurements of $\langle bρ_{\rm SFR}\rangle$, as well as CIB-shear cross-correlations clearly disfavour models with strong stellar feedback, as well as simulations with strong kinetic (jet-driven) AGN feedback, even under the fiducial SMF calibration. This study demonstrates the potential of CIB cross-correlations to study aspects of the physics of star and galaxy formation in a cosmological setting.
发表机构
- Department of Physics, University of Oxford（牛津大学物理系）
- Leiden Observatory, Leiden University（莱顿大学莱顿天文台）
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