AI 中文总结
本研究基于IllustrisTNG模拟的TNG100数据，探究孤立盘状星系的恒星角动量，发现孤立状态不决定星系角动量，恒星盘的富/贫气属性与比角动量直接相关。
AI 中文摘要
角动量是塑造盘状星系演化的基本属性，强烈影响着调控恒星形成的内部机制。据预测，盘状星系内部的角动量含量会随时间变化，这主要是调控星系演化的外部过程导致的。尽管多项数值研究描绘了角动量随环境机制变化的复杂图景，但近期一项观测发现表明，星系在发生相互作用时会遭受角动量损失。我们通过研究在不同孤立程度下选取的模拟盘状星系的恒星角动量，旨在探究孤立状态是否会影响盘状星系的恒星角动量含量，并评估此前报道的重子角动量的环境趋势是否也能仅在恒星成分中体现。我们从IllustrisTNG模拟套件中选取了处于恒星形成阶段的盘状星系，基于局部密度为这些星系计算了孤立参数。我们利用密度阈值将孤立盘状星系与非孤立星系区分开来，并针对它们的角动量含量与其他演化参数开展了对比研究。研究发现，孤立状态本身并不能定义星系的角动量含量；相反，盘状星系是富气还是贫气，与其恒星盘的比角动量$j_*$直接相关。
英文摘要
Angular momentum is a fundamental property that shapes the evolution of disc galaxies, strongly influencing the internal mechanisms that regulate star formation. Its content within disc galaxies is predicted to change over time, mainly as a result of external processes that regulate galaxy evolution. While several numerical studies paint a complex picture of angular momentum variation with environmental mechanisms, a recent observational finding suggests that galaxies are subject to angular momentum loss when they undergo interactions. By studying the stellar angular momentum of simulated disc galaxies selected at various degrees of isolation, we aim to investigate whether isolation affects the stellar angular momentum content of disc galaxies and assess whether the environmental trends previously reported for baryonic angular momentum may also be reflected exclusively in the stellar component. We selected star-forming disc galaxies in the IllustrisTNG simulation suite, for which we computed an isolation parameter based on local density. Using a density threshold, we identified isolated discs from non-isolated galaxies and performed a comparative study of their angular momentum content against other evolutionary parameters. We find that isolation alone does not define the angular momentum content of a galaxy. Rather, whether a disc is gas-rich or gas-poor is directly linked to the specific angular momentum content, $j_*$, of its stellar disc.
Comments11 pages, 11 figures and 1 table. Accepted for publication in A&A
