MAGPI巡天：利用Schwarzschild动力学模型研究类MAGPI的Eagle星系的轨道分布、内禀形状和质量轮廓
The MAGPI Survey: Orbital distributions, intrinsic shapes, and mass profiles for MAGPI-like Eagle galaxies using Schwarzschild dynamical models
AI总结：
该研究用Schwarzschild模型分析Eagle模拟中75个类MAGPI星系，验证模型对内禀轨道、形状和质量轮廓的恢复能力，并与MAGPI观测结果比较。
摘要：
Schwarzschild动力学模型如今被常规应用于局域和遥远宇宙中星系的大型巡天，以获取星系内禀属性的信息，例如其轨道结构以及（暗物质和恒星）质量分布。将遥远宇宙中星系的内部轨道结构和质量分布与模拟进行比较，是理解哪些物理过程负责塑造星系属性的关键。然而，首先必须弄清由观测推导的属性是否能够直接与模拟中的内禀属性进行比较。为评估这一点，我们针对来自Eagle模拟、处于z约0.3的75个星系，为类MUSE的IFS数据立方体（其构造方式类似于MAGPI巡天所获得的数据）构建了Schwarzschild动力学模型。我们将由粒子得到的真实属性与由星系模型推导的属性进行比较。总体而言，我们发现模型能够在定性上很好地恢复星系的真实属性，但包含的暗物质除外：我们发现其中位偏差为48%，这是由于所假设的NFW轮廓无法再现星系内部区域的暗物质分布。随后，我们将由模型推导的属性与观测到的MAGPI星系的Schwarzschild模型推导属性进行比较，发现MAGPI与Eagle之间具有良好一致性：我们的大多数星系（57%）在1个有效半径内具有非扁球形状。更三轴化的星系在其内部区域表现出更高比例的热轨道，并且往往具有更强的径向各向异性。
英文摘要：
Schwarzschild dynamical models are now regularly employed in large surveys of galaxies in the local and distant Universe to derive information on galaxies' intrinsic properties such as their orbital structure and their (dark matter and stellar) mass distribution. Comparing the internal orbital structures and mass distributions of galaxies in the distant Universe with simulations is key to understanding what physical processes are responsible for shaping galaxy properties. However it is first crucial to understand whether observationally derived properties are directly comparable with intrinsic ones in simulations. To assess this, we build Schwarzschild dynamical models for MUSE-like IFS cubes (constructed to be like those obtained by the MAGPI survey) of 75 galaxies at z ~ 0.3 from the Eagle simulations. We compare the true particle-derived properties with the galaxies' model-derived properties. In general, we find that the models can recover the true galaxy properties qualitatively well, with the exception of the enclosed dark matter, where we find a median offset of 48%, which is due to the assumed NFW profile not being able to reproduce the dark matter distribution in the inner region of the galaxies. We then compare our model-derived properties with Schwarzschild models-derived properties of observed MAGPI galaxies and find good agreement between MAGPI and Eagle: the majority of our galaxies (57%) have non-oblate shapes within 1 effective radius. More triaxial galaxies show higher fractions of hot orbits in their inner regions and tend to be more radially anisotropic.
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