核恒星盘的化学演化
Chemical Evolution in Nuclear Stellar Discs
AI总结：
本文首次基于RAMICES II代码对核恒星盘进行多区域化学演化建模，揭示其独特恒星形成历史可打破参数简并，并预测不同气体吸积模式下的丰度分布特征。
摘要：
核恒星盘（NSDs）已在绝大多数棒旋星系（包括银河系）中被观测到。其强烈的恒星形成由周围棒驱动的强烈气体内流所维持，并经常支持大规模的星系喷泉。尽管它们在星系演化中扮演核心角色，但其化学演化在很大程度上仍未被探索。我们认为，核恒星盘的化学成分最好相对于其气体来源的棒端来理解。我们预测了在来自星系棒的不同吸积情景下，核恒星盘内气体和年轻恒星的详细丰度分布。我们首次基于RAMICES II代码对核恒星盘的化学演化进行了系统的多区域建模。我们表明，由于核恒星盘与星系盘的恒星形成历史不同，它们为打破化学演化模型中的参数简并提供了独特的实验室。这使我们能够识别指导核恒星盘核合成的主要参数的影响，并将其与全球增丰历史区分开来。我们还针对两种边缘情况展示了气体吸积到核恒星盘的模式如何印刻在气体丰度分布上，并做出了可通过观测检验的预测。
英文摘要：
Nuclear Stellar Discs (NSDs) have been observed in the vast majority of barred disc galaxies including the Milky Way. Their intense star formation is sustained by the intense gas inflows driven by their surrounding bars and frequently supports a large-scale galactic fountain. Despite their central role in galaxy evolution, their chemical evolution remains largely unexplored. We argue that the chemical composition of NSDs is best understood relative to the bar tips from which their gas is drawn. We make predictions of the detailed abundance profiles of gas and young stars within the NSD under different accretion scenarios from the galactic bar. We present the first systematic, multizonal modelling of the chemical evolution of nuclear stellar discs based on the RAMICES II code. We show that due to their different star formation history to galactic discs, NSDs offer a unique laboratory to break parameter degeneracies in chemical evolution models. This allows us to identify the effects of the main parameters guiding NSD nucleosynthesis and disentangle them from the global enrichment history. We also show for two edge cases how the mode of gas accretion onto the NSD imprints on the gas abundance profiles and make predictions that can be tested with observations.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
