VariableTNG项目：重子机制如何塑造星系特性
The VariableTNG project: how baryonic mechanisms shape galaxy properties
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中文总结 AI 辅助
VariableTNG项目通过50个VariableTNG模拟，明确恒星反馈等重子过程调控高红移星系与黑洞，揭示恒星反馈是早期低质量星系形成与黑洞快速增长的共同物理纽带。
中文摘要 AI 辅助
我们使用50个经Sobol采样的VariableTNG模拟，在固定宇宙学参数和初始条件下改变8个子网格参数，以确定在z=6和z=8时哪些重子过程调控星系和黑洞。我们将模拟结果与近期高红移的恒星质量函数、恒星形成主序、恒星与气相质量-金属丰度关系、恒星质量-大小关系，以及黑洞宿主与吸积特性的测量结果进行对比。这些模拟重现了这些观测中的若干广泛趋势，尽管在气相金属丰度、星系大小以及最极端的黑洞种群方面仍存在差异。考虑到高红移星系特性的物理建模与观测推断都存在大量不确定性，我们将这些差异视为诊断性张力，而非明确的模型失效。随机森林分析揭示了参数敏感性的清晰层级：低质量星系的丰度主要由恒星反馈调控，尤其是超新星温度$T_{\mathrm{SN}}$和热风占比$\tau_{\mathrm{w}}$；恒星形成主序的弥散敏感性较弱且具有红移依赖性。黑洞增长的高吸积尾依赖于黑洞种子和反馈参数，但也依赖于$T_{\mathrm{SN}}$，这表明恒星反馈通过影响可用气体供应间接调控黑洞的快速增长。尽管宇宙方差可能在独立小体积中掩盖这些内在响应，但我们的控制实验确定，恒星反馈是早期低质量星系形成与黑洞快速增长之间的共同物理纽带。
英文摘要
We use 50 Sobol-sampled VariableTNG simulations, varying eight subgrid parameters at fixed cosmology and initial conditions, to determine which baryonic processes regulate galaxies and black holes at $z=6$ and $z=8$. We compare the simulations with recent high-redshift measurements of the stellar mass function, star-forming main sequence, stellar and gas-phase mass-metallicity relations, stellar mass-size relation, and black-hole host and accretion properties. The simulations reproduce several broad trends in these observables, although differences remain in gas-phase metallicity, galaxy size, and the most extreme black-hole populations. Given the substantial uncertainties in both the physical modelling and the observational inference of high-redshift galaxy properties, we regard these differences as diagnostic tensions rather than definitive model failures. Random-forest analyses reveal a clear hierarchy in parameter sensitivity. The abundance of low-mass galaxies is regulated primarily by stellar feedback, particularly the supernova temperature $T_{\mathrm{SN}}$ and thermal wind fraction $τ_{\mathrm{w}}$, whereas the sensitivity of the scatter in the star-forming main sequence is weaker and redshift dependent. The high-accretion tail of black-hole growth depends on black-hole seeding and feedback parameters, but also on $T_{\mathrm{SN}}$, suggesting that stellar feedback indirectly regulates rapid black-hole growth through its impact on the available gas supply. Although cosmic variance can obscure these intrinsic responses in independent small volumes, our controlled experiment identifies stellar feedback as a common physical link between early low-mass galaxy formation and rapid black-hole growth.
发表机构
- Shanghai Astronomical Observatory, Chinese Academy of Sciences（中国科学院上海天文台）
- University of Chinese Academy of Sciences（中国科学院大学）
- Kavli Institute for Astronomy and Astrophysics, Peking University（北京大学科维理天文与天体物理研究所）
- Department of Astronomy, School of Physics, Peking University（北京大学物理学院天文学系）
- School of Astronomy and Space Science, Nanjing University（南京大学天文与空间科学学院）
- Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University, Ministry of Education（南京大学现代天文与天体物理教育部重点实验室）
- Max-Planck-Institut für Astrophysik（马克斯·普朗克天体物理学研究所）
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