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arXiv 2501.04084astro-ph.GA
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星系环境对低质量星系尺寸与暗物质含量的影响

Effects of galactic environment on size and dark matter content in low-mass galaxies

Francisco J. Mercado, Jorge Moreno, Robert Feldmann, Marckie Zeender, Jose A. Benavides, Joanna M. Piotrowska, Courtney Klein, Coral Wheeler, Lina Necib, James … 展开作者

Francisco J. Mercado, Jorge Moreno, Robert Feldmann, Marckie Zeender, Jose A. Benavides, Joanna M. Piotrowska, Courtney Klein, Coral Wheeler, Lina Necib, James S. Bullock, Philip F. Hopkins

备注：
19 pages, 9 figures; submitted to ApJ
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AI总结：

本研究利用FIREbox模拟分析约1,200个低质量星系，发现星系环境不仅直接影响星系尺寸和暗物质含量，还通过halo质量产生间接影响，证实环境是星系演化的基本驱动力。

摘要：

我们利用宇宙学体积模拟FIREbox，研究星系环境如何影响其尺寸和暗物质含量。本研究聚焦于低质量区间约1,200个星系（886个中心星系halo和332个卫星星系halo），其恒星质量介于$10^6$至$10^9$ $M_{\odot}$之间。我们分析了尺寸-质量关系（$r_{50} - M_{\star}$）、内部暗物质质量-恒星质量关系（$M^{50}_{\rm DM} - M_{\star}$）以及halo质量-恒星质量关系（$M_{\rm halo} - M_{\star}$）。在固定恒星质量下，我们发现受较强潮汐影响的星系（以较高的扰动指数PI $>$ 1表示）通常尺寸更大，且相对于扰动指数较低（PI $<$ 1）的同类星系质量更低。应用Random Forest回归模型，我们表明环境（PI）和halo质量（$M_{\rm halo}$）都是星系相对尺寸和暗物质含量的重要预测因子。值得注意的是，由于$M_{\rm halo}$也深受环境影响，我们的发现表明环境条件不仅直接影响星系尺寸和相对内部暗物质含量，还通过影响halo质量产生间接影响。结果突出了环境因素与halo质量在塑造星系性质间的关键相互作用，证实环境是星系形成与演化中的基本驱动力。

英文摘要：

We utilize the cosmological volume simulation, FIREbox, to investigate how a galaxy's environment influences its size and dark matter content. Our study focuses on approximately 1,200 galaxies (886 central and 332 satellite halos) in the low-mass regime, with stellar masses between $10^6$ to $10^9$ $M_{\odot}$. We analyze the size-mass relation ($r_{50} - M_{\star}$), inner dark matter mass-stellar mass ($M^{50}_{\rm DM} - M_{\star}$) relation, and the halo mass-stellar mass ($M_{\rm halo} - M_{\star}$) relation. At fixed stellar mass, we find the galaxies experiencing stronger tidal influences, indicated by higher Perturbation Indices (PI $>$ 1) are generally larger and have lower masses relative to their counterparts with lower Perturbation Indices (PI $<$ 1). Applying a Random Forest regression model, we show that both the environment (PI) and halo mass ($M_{rm halo}$) are significant predictors of a galaxy's relative size and dark matter content. Notably, because $M_{\rm halo}$ is also strongly affected by the environment, our findings indicate that environmental conditions not only influence galactic sizes and relative inner dark matter content directly, but also indirectly through their impact on halo mass. Our results highlight a critical interplay between environmental factors and halo mass in shaping galaxy properties, affirming the environment as a fundamental driver in galaxy formation and evolution.

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