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首页> 外文期刊>The Astrophysical journal >COOLING, GRAVITY, AND GEOMETRY: FLOW-DRIVEN MASSIVE CORE FORMATION
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COOLING, GRAVITY, AND GEOMETRY: FLOW-DRIVEN MASSIVE CORE FORMATION

机译：冷却，重力和几何形状：流动驱动的大规模岩心形成

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摘要

We study numerically the formation of molecular clouds in large-scale colliding flows including self-gravity. The models emphasize the competition between the effects of gravity on global and local scales in an isolated cloud. Global gravity builds up large-scale filaments, while local gravity, triggered by a combination of strong thermal and dynamical instabilities, causes cores to form. The dynamical instabilities give rise to a local focusing of the colliding flows, facilitating the rapid formation of massive protostellar cores of a few hundred M_⊙. The forming clouds do not reach an equilibrium state, although the motions within the clouds appear to be comparable to virial. The self-similar core mass distributions derived from models with and without self-gravity indicate that the core mass distribution is set very early on during the cloud formation process, predominantly by a combination of thermal and dynamical instabilities rather than by self-gravity.
机译：我们从数值上研究了包括自重在内的大规模碰撞流中分子云的形成。这些模型强调了孤立云中重力对全球和局部尺度的影响之间的竞争。整体重力会形成大型细丝，而强烈的热和动力不稳定性会触发局部重力，从而导致纤芯形成。动力学上的不稳定性引起了碰撞流的局部集中，从而促进了数百M_⊙的大型原恒星核心的快速形成。尽管云中的运动似乎与病毒性运动相当，但形成的云并没有达到平衡状态。从具有和不具有自重的模型得出的自相似岩心质量分布表明，岩心质量分布是在云形成过程中很早就设定的，主要是由热和动力不稳定性的结合而不是自重引起的。

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