论文标题
具有哈勃定律速度曲线的“头/尾”等离子体模型
A "head/tail" plasmon model with a Hubble law velocity profile
论文作者
论文摘要
我们提出了一个模型的模型，该模型是由具有射血速度的事件产生的，该事件首先生长，达到峰值，然后在有限的时间内再次降低至零速度（同时，射血密度可以具有任意时间差异）。我们获得了带有领先的“头”和尾随的“尾巴”的流动，该流程比脉冲的宽度大的时间发展了线性，“哈勃定律”速度与位置。我们提出了一个简单脉冲的分析模型，该模型具有抛物线射击速度与时间和时间无关的质量损失速率，并将其与适合在行星星云中快速结的参数进行比较。这种“头部/尾等离子体”流量可能适用于带有“哈勃定律”尾巴的其他高速团块。
We present a model of a hypersonic, collimated, "single pulse" outflow, produced by an event with an ejection velocity that first grows, reaches a peak, and then decreases again to zero velocity in a finite time (simultaneously, the ejection density can have an arbitrary time-variability). We obtain a flow with a leading "head" and a trailing "tail" that for times greater than the width of the pulse develops a linear, "Hubble law" velocity vs. position. We present an analytic model for a simple pulse with a parabolic ejection velocity vs. time and time-independent mass-loss rate, and compare it to an axisymmetric gasdynamic simulation with parameters appropriate for fast knots in planetary nebulae. This "head/tail plasmon" flow might be applicable to other high-velocity clumps with "Hubble law" tails.
