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arXiv 2502.20437astro-ph.GAastro-ph.CO
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介绍THESAN-ZOOM项目:具有多相星际介质的高红移星系的辐射流体动力学模拟

Introducing the THESAN-ZOOM project: radiation-hydrodynamic simulations of high-redshift galaxies with a multi-phase interstellar medium

Rahul Kannan, Ewald Puchwein, Aaron Smith, Josh Borrow, Enrico Garaldi, Laura Keating, Mark Vogelsberger, Oliver Zier, William McClymont, Xuejian Shen, Filip Po… 展开作者

Rahul Kannan, Ewald Puchwein, Aaron Smith, Josh Borrow, Enrico Garaldi, Laura Keating, Mark Vogelsberger, Oliver Zier, William McClymont, Xuejian Shen, Filip Popovic, Sandro Tacchella, Lars Hernquist, Volker Springel

AI总结:

THESAN-ZOOM项目通过高分辨率辐射流体动力学模拟,结合多相ISM模型,再现了高红移星系的关键观测特征,为解读JWST数据提供了可靠框架。

摘要:

我们介绍THESAN-ZOOM项目,这是一个从THESAN模拟体积中选取的14个高红移(z>3)星系的高分辨率放大模拟的综合套件。该样本涵盖了广泛的暗物质晕质量范围,在z=3时M_halo约为10^8至10^13太阳质量。在最高分辨率下,模拟实现了142太阳质量的重子质量和17 cpc的引力软化长度。我们采用最先进的多相星际介质(ISM)模型,该模型通过非平衡热化学网络自洽地包含了恒星反馈、辐射场、尘埃物理和低温冷却。我们独特的框架通过采用来自母体THESAN模拟盒的大尺度辐射场拓扑结构,而非假设空间均匀的紫外背景,来纳入斑块状再电离的影响。总的来说,THESAN-ZOOM包含60个模拟,包括基准运行和旨在研究数值和物理参数对星系性质影响的补充变体。基准模拟集再现了丰富的高红移观测数据,如恒星-暗物质晕质量关系、恒星形成主序、Kennicutt-Schmidt关系和质量-金属丰度关系。虽然我们的模拟略微高估了低质量和低光度星系的数量,但在高质量端与观测到的恒星和紫外光度函数吻合良好。此外,恒星形成率密度与z=3至14的观测估计值紧密匹配。这些结果表明,模拟有效地再现了高红移星系的许多基本特征,为解释JWST令人兴奋的新观测提供了一个现实的框架。

英文摘要:

We introduce the THESAN-ZOOM project, a comprehensive suite of high-resolution zoom-in simulations of $14$ high-redshift ($z>3$) galaxies selected from the THESAN simulation volume. This sample encompasses a diverse range of halo masses, with $M_\mathrm{halo} \approx 10^8 - 10^{13}~\mathrm{M}_\odot$ at $z=3$. At the highest-resolution, the simulations achieve a baryonic mass of $142~\mathrm{M}_\odot$ and a gravitational softening length of $17~\mathrm{cpc}$. We employ a state-of-the-art multi-phase interstellar medium (ISM) model that self-consistently includes stellar feedback, radiation fields, dust physics, and low-temperature cooling through a non-equilibrium thermochemical network. Our unique framework incorporates the impact of patchy reionization by adopting the large-scale radiation field topology from the parent THESAN simulation box rather than assuming a spatially uniform UV background. In total, THESAN-ZOOM comprises $60$ simulations, including both fiducial runs and complementary variations designed to investigate the impact of numerical and physical parameters on galaxy properties. The fiducial simulation set reproduces a wealth of high-redshift observational data such as the stellar-to-halo-mass relation, the star-forming main sequence, the Kennicutt-Schmidt relation, and the mass-metallicity relation. While our simulations slightly overestimate the abundance of low-mass and low-luminosity galaxies they agree well with observed stellar and UV luminosity functions at the higher mass end. Moreover, the star-formation rate density closely matches the observational estimates from $z=3-14$. These results indicate that the simulations effectively reproduce many of the essential characteristics of high-redshift galaxies, providing a realistic framework to interpret the exciting new observations from JWST.

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