HYDRODYNAMICAL COUPLING OF MASS AND MOMENTUM IN MULTIPHASE GALACTIC WINDS
HYDRODYNAMICAL COUPLING OF MASS AND MOMENTUM IN MULTIPHASE GALACTIC WINDS
复制标题
多相星系风中质量和动量的流体动力学耦合
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
B. Robertson
中科院分区：
文献类型：
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作者：
E. Schneider;B. Robertson
使用一组高分辨率的流体动力学模拟运行的Cholla代码，我们调查如何质量和动量耦合到银河风的多相分量。这些模拟模拟了超新星爆炸驱动的热风与星际或环星系介质的较冷、较密集的云之间的相互作用。通过解析pc距离上的pc尺度，我们的计算捕获了云破裂如何导致多相流出中的密度和温度分布，并量化了与每个相关联的质量和动量。我们发现，多相风包含相当的质量和动量的相位在很宽的范围内的密度和温度从热风（K）延伸到最冷的组件（K）。我们进一步发现，动量分布大致成比例的质量在每个阶段，和质量加载的热相的冷，致密的材料的破坏是一个有效的过程。这些结果提供了新的洞察所观察到的多相星系外流的物理起源，并告知星系形成模型，包括星系风的粗糙处理。我们的研究结果证实，在距离星系（kpc）很远的流出物中观察到的冷气体可能并不是通过中央星暴附近的冷物质的夹带而产生的。
Using a set of high-resolution hydrodynamical simulations run with the Cholla code, we investigate how mass and momentum couple to the multiphase components of galactic winds. The simulations model the interaction between a hot wind driven by supernova explosions and a cooler, denser cloud of interstellar or circumgalactic media. By resolving scales of pc over pc distances, our calculations capture how the cloud disruption leads to a distribution of densities and temperatures in the resulting multiphase outflow and quantify the mass and momentum associated with each phase. We find that the multiphase wind contains comparable mass and momenta in phases over a wide range of densities and temperatures extending from the hot wind ( , K) to the coldest components ( , K). We further find that the momentum distributes roughly in proportion to the mass in each phase, and the mass loading of the hot phase by the destruction of cold, dense material is an efficient process. These results provide new insight into the physical origin of observed multiphase galactic outflows and inform galaxy formation models that include coarser treatments of galactic winds. Our results confirm that cool gas observed in outflows at large distances from the galaxy ( kpc) likely does not originate through the entrainment of cold material near the central starburst.
影响因子：
64.8
作者：
M. Vogelsberger;S. Genel;V. Springel;P. Torrey;D. Sijacki;Da Xu;G. Snyder;Simeon Bird;D. Nelson;Lars Hernquist Mit;HarvardCfA;Hits;I. Cambridge;Stsci;Ias Princeton
通讯作者：
M. Vogelsberger;S. Genel;V. Springel;P. Torrey;D. Sijacki;Da Xu;G. Snyder;Simeon Bird;D. Nelson;Lars Hernquist Mit;HarvardCfA;Hits;I. Cambridge;Stsci;Ias Princeton