论文标题
银河系光环中的多相湍流:驾驶的效果
Multiphase turbulence in galactic halos: effect of the driving
论文作者
论文摘要
超新星爆炸,活跃的银河核喷气机,银河系相互作用和聚类合并可以驱动圆形培养基(CGM)和簇内培养基(ICM)中的湍流。但是,这些来源强迫湍流的确切性质及其对CGM/ICM及其全球热力学的不同统计特性的影响仍不清楚。为了研究不同类型的强迫的影响,我们进行了高分辨率($ 1008^3 $分辨率元素)理想化的流体动力模拟,并具有纯粹的电磁阀(无差异)强迫,纯粹的压缩(无卷曲)强迫和自然混合物(两种组件的相等分数)。模拟还包括辐射冷却。我们研究了三种不同强迫模式(SOL,COMP,混合)对气体形态的影响,其温度和密度分布,Enstrophophy的温度和密度分布,源和下沉,即螺线管运动,以及热的动力学以及热的动力学H $α$排放气体。我们发现,与螺线管强迫相比,压缩强迫会导致气体的密度和温度变化更大。冷相气体形成大规模丝状结构,用于压迫强迫和雾化的小型云,用于螺线管强迫。冷相气具有更强的大规模速度,可压缩强迫。自然混合物强迫显示了两个极端之间的运动学和气体分布,冷相气体是大规模细丝和小规模的薄雾云。
Supernova explosions, active galactic nuclei jets, galaxy--galaxy interactions and cluster mergers can drive turbulence in the circumgalactic medium (CGM) and in the intracluster medium (ICM). However, the exact nature of turbulence forced by these sources and its impact on the different statistical properties of the CGM/ICM and their global thermodynamics is still unclear. To investigate the effects of different types of forcing, we conduct high resolution ($1008^3$ resolution elements) idealised hydrodynamic simulations with purely solenoidal (divergence-free) forcing, purely compressive (curl-free) forcing, and natural mixture forcing (equal fractions of the two components). The simulations also include radiative cooling. We study the impact of the three different forcing modes (sol, comp, mix) on the morphology of the gas, its temperature and density distributions, sources and sinks of enstrophy, i.e., solenoidal motions, as well as the kinematics of hot ($\sim10^7~\mathrm{K}$) X-ray emitting and cold ($\sim10^4~\mathrm{K}$) H$α$ emitting gas. We find that compressive forcing leads to stronger variations in density and temperature of the gas as compared to solenoidal forcing. The cold phase gas forms large-scale filamentary structures for compressive forcing and misty, small-scale clouds for solenoidal forcing. The cold phase gas has stronger large-scale velocities for compressive forcing. The natural mixture forcing shows kinematics and gas distributions intermediate between the two extremes, the cold-phase gas occurs as both large-scale filaments and small-scale misty clouds.