标题： 棒的形成对恒星形成分离和恒星迁移的影响：银河盘恒星年龄分布变化的启示 显示英文标题

标题： Influence of Bar Formation on Star Formation Segregation and Stellar Migration: Implications for Variations in the Age Distribution of Milky Way Disk Stars

摘要： 我们提出了一个关于孤立银河系的化学动力学$N$-体/流体动力学模拟，以研究棒的形成如何影响恒星形成率、恒星迁移以及盘星最终的年龄和金属丰度分布。专注于棒形成的瞬态阶段——这一阶段触发了气体内流、增强了局域恒星形成，并驱动显著的轨道迁移，我们发现内盘的恒星形成率在此期间表现出明显的峰值。这种行为源于棒形成之前的强烈螺旋臂驱动的恒星形成，以及随后棒建立后恒星形成的抑制。相比之下，外盘的恒星形成在棒形成之后以适度水平持续存在，而原本形成于内区的恒星增强的向外迁移导致外盘恒星年龄分布中出现与棒形成时期相对应的明显峰值。此外，此时期的恒星倾向于表现出更高的气相金属丰度，反映出它们起源于更富金属的内区。尽管我们的模型未能捕捉到银河系复杂演化的每一个细节，但我们的结果强调了由棒驱动的迁移在分离恒星形成活动和塑造银河盘长期化学和年龄结构中的主导作用。近期观测研究表明银河系的棒大约有8 Gyr的历史；因此，我们的研究结果表明太阳圈和外盘恒星的年龄分布应在该年龄附近显示出相应的峰值。 显示英文摘要

摘要： We present a chemo-dynamical $N$-body/hydrodynamic simulation of an isolated Milky Way-like galaxy to investigate how bar formation influences star formation rates, stellar migration, and the resulting age and metallicity distributions of disk stars. Focusing on the transient epoch of bar formation, a phase that triggers gas inflows, enhances local star formation, and drives significant orbital migration, we find that the star formation rate in the inner disk exhibits a pronounced peak during this period. This behavior arises from the combined effect of vigorous star formation driven by strong spiral arms prior to bar formation and the subsequent suppression of star formation once the bar is established. In contrast, star formation in the outer disk persists after bar formation at modest levels, and enhanced outward migration of stars originally formed in the inner regions gives rise to a pronounced peak in the outer disk's stellar age distribution corresponding to the bar formation epoch. Moreover, stars formed during this epoch tend to exhibit higher gas-phase metallicities, reflecting their origin in more metal-rich inner regions. Although our model does not capture every detail of the Milky Way's complex evolution, our results highlight the dominant role of bar driven migration in segregating star formation activity and in shaping the long-term chemical and age structure of the Galactic disk. Recent observational studies suggest that the Milky Way's bar is approximately 8 Gyr old; therefore, our findings imply that the age distribution of stars in the solar circle and outer disk should show a corresponding peak around that age.