论文标题
猎户座手指的形成
Formation of Orion Fingers
论文作者
论文摘要
“猎户手指”是一个由数十个弓箭组成的系统，冲击的翅膀指向通用的原始系统，该系统以动态瓦解的几个巨大恒星的动态分解系统为中心。冲击头的速度高达300-400 km/s，但是“子弹”的形成和物理特性尚不清楚。在这里，我们总结了形成“子弹”和由此产生的弓箭（“手指”）的两种可能的情况。在第一种情况下，子弹是自我磨碎的，木星质量对象，在大型恒星及其磁盘的强烈动力相互作用中迅速形成，然后弹出。这种情况自然地解释了子弹出口和大型恒星动态相互作用的类似时间尺度，但是很难解释观察到的子弹的高速度。在第二种情况下，子弹是通过巨大的，红外驱动的风中的流体动力不稳定性形成的，自然地解释了高速度和流出的形态，但不需要子弹是自我磨损的。产生猎户座手指的过程可能不是该特定恒星形成区域所独有的，并且可能导致自由浮动，高速，无核心行星。
"Orion fingers" are a system of dozens of bowshocks, with the wings of shocks pointing to a common system of origin, which is centered on a dynamically disintegrating system of several massive stars. The shock heads propagate with velocities of up to 300-400 km/s, but the formation and physical properties of the "bullets" leading the shocks are not known. Here we summarize two possible scenarios for the formation of the "bullets" and the resulting bowshocks ("fingers"). In the first scenario, bullets are self-gravitating, Jupiter-mass objects which were formed rapidly and then ejected during the strong dynamical interactions of massive stars and their disks. This scenario naturally explains the similar timescales for the outflow of bullets and for the dynamical interaction of the massive stars, but has some difficulty explaining the observed high velocities of the bullets. In the second scenario, bullets are formed via hydrodynamic instabilities in a massive, infrared-driven wind, naturally explaining the high velocities and the morphology of outflow, but the bullets are not required to be self-gravitating. The processes that created the Orion fingers are likely not unique to this particular star-forming region and may result in free-floating, high-velocity, core-less planets.
