论文标题
多相ISM的RAM压力剥离：Tigress模拟的详细视图
Ram pressure stripping of the multiphase ISM: a detailed view from TIGRESS simulations
论文作者
论文摘要
RAM压力剥离（RPS）是一个快速去除星际介质（ISM）的过程，在星系进化中起着至关重要的作用。先前的RPS研究已将ISM视为单相或缺乏分辨率和物理过程，无法正确捕获整个多相ISM。为了改善这种简化，我们将流入的热量内介质（ICM）引入了使用Tigress框架的局部恒星形成银河系磁盘中的自愿建模的ISM。我们的模拟表明，RPS的工作不仅是ICM RAM压力通过ISM直接加速，而且还混合了涉及显着相变和辐射冷却的动量转移。热ICM穿过多孔多相ISM的低密度通道，切碎凉爽的ISM，并创建混合层。 ICM动量通过混合层转移，同时填充中等温度气体并辐射热能。混合气体延伸到银河系盘和形式的尾巴上，除非ICM通量足够大以防止冷却直至逃脱模拟域。混合驱动的动量转移预测，ICM的混合速度越多，ISM移动的速度就越快，从而导致了剥离ISM的流出速度和气体金属性的抗相关性。与没有ICM的模型相比，由于ICM RAM压力，ISM磁盘的压缩提高了50％的恒星形成速率。随着ICM RAM压力高于磁盘锚固压力，恒星形成在〜100 MYR之内被淬灭。
Ram pressure stripping (RPS) is a process that removes the interstellar medium (ISM) quickly, playing a vital role in galaxy evolution. Previous RPS studies have treated the ISM as single-phase or lack the resolution and physical processes to properly capture the full multiphase ISM. To improve this simplification, we introduce an inflowing, hot intracluster medium (ICM) into a self-consistently modeled ISM in a local patch of star-forming galactic disks using the TIGRESS framework. Our simulations reveal that the workings of RPS are not only direct acceleration of the ISM by ICM ram pressure but also mixing-driven momentum transfer involving significant phase transition and radiative cooling. The hot ICM passes through the low-density channels of the porous, multiphase ISM, shreds the cool ISM, and creates mixing layers. The ICM momentum is transferred through the mixing layers while populating the intermediate temperature gas and radiating thermal energy away. The mixed gas extends beyond galactic disks and forms stripped tails that cool back unless the ICM fluxes are large enough to prevent cooling until they escape the simulation domain. The mixing-driven momentum transfer predicts that the more ICM mixes in, the faster the ISM moves, resulting in the anti-correlation of outflow velocity and gas metallicity of the stripped ISM. The compression of the ISM disks due to the ICM ram pressure enhances star formation rates up to 50% compared to the model without ICM. With the ICM ram pressure higher than the disk anchoring pressure, star formation is quenched within ~100 Myr.
