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arXiv 2207.03370astro-ph.GA
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风吹气泡向非均匀星际介质的动量和能量注入

Momentum and energy injection by a wind-blown bubble into an inhomogeneous interstellar medium

J. M. Pittard

摘要:

我们调查的质量加载嵌入云的风吹气泡的演变的效果。我们使用一维流体动力学计算,并假设云是足够多的,他们可以在连续的限制,并迅速混合发生,使注入的质量迅速合并与全球流动。嵌入云的破坏增加了气泡的质量,增加了它的密度。由于摩擦阻力,质量负载增加了未受冲击的恒星风的温度,并降低了热冲击气体的温度,因为可用的热能在更多的粒子之间共享。质量负载可能会增加或减少体积平均气泡压力。质量加载气泡较小,具有较少的保留能量和较低的径向动量,但在所有情况下,检查仍然能够做大量的$PdV$工作的扫气。在后一个方面,泡沫更接近于能量守恒泡沫,而不是“淬灭”泡沫的动量守恒行为。

英文摘要:

We investigate the effect of mass-loading from embedded clouds on the evolution of wind-blown bubbles. We use 1D hydrodynamical calculations and assume that the clouds are numerous enough that they can be treated in the continuous limit, and that rapid mixing occurs so that the injected mass quickly merges with the global flow. The destruction of embedded clouds adds mass into the bubble, increasing its density. Mass-loading increases the temperature of the unshocked stellar wind due to the frictional drag, and reduces the temperature of the hot shocked gas as the available thermal energy is shared between more particles. Mass-loading may increase or decrease the volume-averaged bubble pressure. Mass-loaded bubbles are smaller, have less retained energy and lower radial momentum, but in all cases examined are still able to do significant $PdV$ work on the swept-up gas. In this latter respect, the bubbles more closely resemble energy-conserving bubbles than the momentum-conserving-like behaviour of ``quenched'' bubbles.

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