论文标题
来自模拟星系和金属流量主序列的氧损失：预测质量和环境的依赖性
Oxygen Loss from Simulated Galaxies and the Metal Flow Main Sequence: Predicting the Dependence on Mass and Environment
论文作者
论文摘要
我们预测宇宙学模拟中星系中损失的氧气的质量分数是当今恒星质量和环境的函数。具有恒星质量的分布是双峰的，分离了星形和淬火星系。气体和恒星的金属性是使用包括II型超新星和IA，Hyphynovae和渐近巨型分支星的化学演化模型自动计算的。每个星系中损失的氧气质量是通过将星系中的气体和恒星与当今恒星种群产生的氧的现有氧与氧的现有氧计算而计算的。比低质量星系（$ \ sim 40-70％），更大的星系能够保留其金属的一小部分（$ \ sim 100 $）。与恒星形成主序列一样，恒星形成星系也遵循氧气质量损失的紧密关系 - 金属流量主序列ZFM-由于AGN驱动的风，大量淬灭的星系倾向于损失更大的氧气（最高20％）。卫星星系损失的氧气量取决于其相互作用史的细节，而较富裕的人群往往会损失其氧气的较大部分。星系中金属保留率的观察性估计将对星系进化的模型有很大的限制。
We predict the mass fraction of oxygen lost from galaxies in a cosmological simulation as a function of stellar mass and environment at the present day. The distribution with stellar mass is bimodal, separating star-forming and quenched galaxies. The metallicity of gas and stars is self-consistently calculated using a chemical evolution model that includes supernovae type II and Ia, hypernovae, and asymptotic giant branch stars. The mass of oxygen lost from each galaxy is calculated by comparing the existing oxygen in gas and stars in the galaxy to the oxygen that should have been produced by the present-day population of stars. More massive galaxies are able to retain a greater fraction of their metals ($\sim 100$ per cent) than low-mass galaxies ($\sim 40 - 70$ per cent). As in the star formation main sequence, star-forming galaxies follow a tight relationship also in terms of oxygen mass lost -- a metal flow main sequence, ZFMS -- whereas massive quenched galaxies tend to have lost a greater fraction of oxygen (up to 20 per cent), due to AGN-driven winds. The amount of oxygen lost by satellite galaxies depends on the details of their interaction history, and those in richer groups tend to have lost a greater fraction of their oxygen. Observational estimates of metal retention in galaxies will provide a strong constraint on models of galaxy evolution.
