论文标题
星爆驱动银河流出的物理性质
The Physical Nature of Starburst-Driven Galactic Outflows
论文作者
论文摘要
我们介绍了Cholla银河流出模拟套件（CGOLS）的第四个。使用簇的超新星反馈的物理动机处方，我们成功地从磁盘星系中驱动了多相流出。 The high resolution ($< 5\,\mathrm{pc}$) across a relatively large domain ($20\,\mathrm{kpc}$) allows us to capture the hydrodynamic mixing and dynamical interactions between the hot and cool ($T \sim 10^4\,\mathrm{K}$) phases in the outflow, which in turn leads to direct evidence of a qualitatively new mechanism用于银河风中的冷气加速。我们表明，从热阶段到凉爽相位的动量混合将凉爽的气体加速至$ 800 \，\ mathrm {km} \，\ Mathrm {s}^{ - 1} $在KPC秤上，并且属性与RAM压力加速的物理模型不一致或与热量相处的物理模型不一致。混合过程还会影响热相，从径向超音速流的期望中改变其温度，密度和速度的径向谱。这种机制为高速，蓝色移动，低电离吸收线的高速度提供了物理解释，通常在Starburst和高红移星系的光谱中观察到。
We present the fourth of the Cholla Galactic OutfLow Simulations suite (CGOLS). Using a physically-motivated prescription for clustered supernova feedback, we successfully drive a multiphase outflow from a disk galaxy. The high resolution ($< 5\,\mathrm{pc}$) across a relatively large domain ($20\,\mathrm{kpc}$) allows us to capture the hydrodynamic mixing and dynamical interactions between the hot and cool ($T \sim 10^4\,\mathrm{K}$) phases in the outflow, which in turn leads to direct evidence of a qualitatively new mechanism for cool gas acceleration in galactic winds. We show that mixing of momentum from the hot phase to the cool phase accelerates the cool gas to $800\,\mathrm{km}\,\mathrm{s}^{-1}$ on kpc scales, with properties inconsistent with the physical models of ram pressure acceleration or with bulk cooling from the hot phase. The mixing process also affects the hot phase, modifying its radial profiles of temperature, density, and velocity from the expectations of radial supersonic flow. This mechanism provides a physical explanation for the high velocity, blue shifted, low ionization absorption lines often observed in the spectra of starburst and high redshift galaxies.
