AI 中文总结
该研究旨在扩展基于作用的框架，通过新方法将恒星形成模拟的化学性质映射到纯N体模拟上，应用于两个棒状星系模型，再现了化学动力学趋势，为连接棒旋星系动力学与化学演化提供了高效灵活的方法。
AI 中文摘要
我们旨在扩展先前研究提出的基于作用的框架，将化学信息分配给棒旋星系的无碰撞N体模拟，以便与观测进行更现实的比较。我们开发了一种新方法，使用匹配算法将恒星形成的N体+流体动力学模拟（供体模型）的化学性质映射到纯N体模拟（目标模型）上。我们将该方法应用于两个棒状N体星系，一个类似银河系且有经典核球，另一个有强烈弯曲的棒，并结合两个在[Fe/H]-[$\alpha$/Fe]平面上呈现双峰和单峰化学轨迹的恒星形成供体模型。我们构建的模型再现了银河系和外部星系中观测到的关键化学动力学趋势。富含金属的星族与X形核球形态更紧密相关，[Fe/H]-[O/Fe]分布显示出纬度相关的双峰性，红团星的模拟星等分布显示富含金属的星族有更强的X形。在有经典核球的模型中，贫金属恒星在经纬度平面上呈现更球形的形态，而富金属恒星呈盒状分布，与银河系核球的观测一致。所提出的基于作用的化学分配提供了一种计算高效且灵活的方法来连接棒旋星系的动力学和化学演化，能够对星系核球进行现实的化学动力学建模。
英文摘要
We aim to extend the action-based framework, proposed by a previous study, for assigning chemical information to collisionless $N$-body simulations of barred galaxies, enabling more realistic comparisons with observations. We developed a new method to map chemistry of star-forming $N$-body+hydrodynamical simulations (donor models) onto pure $N$-body simulations (target models) using a matching algorithm. We applied the method to two barred $N$-body galaxies, one Milky Way (MW)-like with a classical bulge and another with a strongly buckled bar, combined with two star-forming donor models exhibiting bimodal and unimodal chemical tracks in the [Fe/H]-[$α/$Fe] plane. Our models reproduce key chemo-dynamical trends observed in the MW and external galaxies. Metal-rich populations are more strongly associated with the X-shaped bulge morphology, leading to vertically pinched metallicity maps consistent with observations and chemo-hydrodynamical simulations. The [Fe/H]-[O/Fe] distributions show latitude-dependent bimodality, and the mock magnitude distributions of red clump stars reveal a stronger X-shape for metal-rich populations. In the model with a classical bulge, metal-poor stars exhibit a more spherical morphology on the longitude-latitude plane, while metal-rich stars show a boxy distribution, consistent with observations of the MW bulge. The proposed action-based chemical assignment provides a computationally efficient and flexible approach to link the dynamical and chemical evolution of barred galaxies. It enables realistic chemo-dynamical modelling of the galactic bulges.
Comments13 pages, 17 figures, 2 appendices, submitted
