FORMATION OF COLD FILAMENTARY STRUCTURE FROM WIND-BLOWN SUPERBUBBLES
FORMATION OF COLD FILAMENTARY STRUCTURE FROM WIND-BLOWN SUPERBUBBLES
复制标题
风吹超级气泡形成冷丝状结构
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
F. Heitsch
中科院分区：
文献类型：
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作者：
E. Ntormousi;A. Burkert;K. Fierlinger;F. Heitsch
对两个风吹超级气泡的膨胀和碰撞进行了数值研究。我们的模型超越了之前对会聚气流形成分子云的模拟，通过使用真实的流动参数、尺寸和时间尺度探索这一过程。超级气泡是由随时间变化的风和超新星爆炸吹起的，这些风和超新星爆炸是根据人口合成模型计算得出的。它们膨胀成均匀或湍流的扩散介质。我们发现，在两个超级气泡的压缩碰撞区中自然形成了致密、寒冷的气体团块和细丝。它们的形状类似于观察到的冷分子气体细丝和团块的细长、不规则结构。模拟结束时，模拟箱中总气体质量的 65% 到 80% 包含在这些结构中。这些团块处于多种物理状态，从与周围介质的压力平衡到具有大的不规则内部运动和旋转支撑结构的高度低压团块。
The expansion and collision of two wind-blown superbubbles is investigated numerically. Our models go beyond previous simulations of molecular cloud formation from converging gas flows by exploring this process with realistic flow parameters, sizes, and timescales. The superbubbles are blown by time-dependent winds and supernova explosions, calculated from population synthesis models. They expand into a uniform or turbulent diffuse medium. We find that dense, cold gas clumps and filaments form naturally in the compressed collision zone of the two superbubbles. Their shapes resemble the elongated, irregular structure of observed cold, molecular gas filaments, and clumps. At the end of the simulations, between 65% and 80% of the total gas mass in our simulation box is contained in these structures. The clumps are found in a variety of physical states, ranging from pressure equilibrium with the surrounding medium to highly underpressured clumps with large irregular internal motions and structures which are rotationally supported.