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arXiv 2102.05061astro-ph.GA
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我记得这是云的错觉:混合驱动来自冲压压力剥离Galerkin的云的加速

It's Cloud's Illusions I Recall: Mixing Drives the Acceleration of Clouds from Ram Pressure Stripped Galaxies

Stephanie Tonnesen, Greg L. Bryan

摘要:

Ram Pressure Stripping可以通过团内介质(ICM)与星际介质之间的直接相互作用将星系团中卫星星系的气体去除。这种相互作用通常被认为是单位面积的接触力,然而我们指出,这些气体必须以流体动力学的方式相互作用,并认为这将导致银河系气体与ICM风的混合。我们开发了一个分析框架,如何混合有关的剥离气体从卫星星系的加速。然后,我们测试这个模型使用三个“风洞”模拟银河系的星系与移动ICM相互作用,并找到很好的协议与预测使用的分析框架。集中在剥离尾部的致密团块,我们发现,它们几乎均匀地与ICM混合,表明尾部的所有气体与周围环境混合,致密团块不是单独的实体,与扩散气体不同。我们发现,虽然混合驱动剥离气体的加速,周围风的密度和速度将决定是否混合的结果在剥离气体加热到ICM,或ICM冷却到稠密的云。

英文摘要:

Ram Pressure Stripping can remove gas from satellite galaxies in clusters via a direct interaction between the intracluster medium (ICM) and the interstellar medium. This interaction is generally thought of as a contact force per area, however we point out that these gases must interact in a hydrodynamic fashion, and argue that this will lead to mixing of the galactic gas with the ICM wind. We develop an analytic framework for how mixing is related to the acceleration of stripped gas from a satellite galaxy. We then test this model using three "wind-tunnel" simulations of Milky Way-like galaxies interacting with a moving ICM, and find excellent agreement with predictions using the analytic framework. Focusing on the dense clumps in the stripped tails, we find that they are nearly uniformly mixed with the ICM, indicating that all gas in the tail mixes with the surroundings, and dense clumps are not separate entities to be modeled differently than diffuse gas. We find that while mixing drives acceleration of stripped gas, the density and velocity of the surrounding wind will determine whether the mixing results in the heating of stripped gas into the ICM, or the cooling of the ICM into dense clouds.

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