幕式外流的质量-速度和位置-速度关系
The Mass-Velocity and Position-Velocity Relations in Episodic Outflows
摘要：
虽然观测证据的年轻恒星外流的情节性质继续安装，现有的分子外流的数值和理论模型假设它们是由一个非情节风从一个年轻的恒星物体与周围的云的相互作用。在这封信中，我们估计并讨论了在分子外流中观察到的质量-速度和位置-速度关系的影响。我们解释了有多少最近的观测结果不同意非情节外流模型的预测，我们提供了简单的解释的差异。特别是，我们讨论了如何一个情节恒星外流可以陡峭的幂律斜率的质量-速度关系的分子外流。并且，我们说明了如何一个情节外流可以产生多个“哈勃楔形”的位置-速度分布的分子外流。如果有比我们现在更多的信息，就有可能使用嵌入分子外流的质量-速度和位置-速度关系中的“化石记录”来重建年轻恒星物体的质量喷射事件的历史。
英文摘要：
While observational evidence for the episodic nature of young stellar outflows continues to mount, existing numerical and theoretical models of molecular outflows assume they are formed by the interaction of a non-episodic wind from a young stellar object with an ambient cloud. In this Letter we estimate and discuss the effects of episodicity on the mass-velocity and position-velocity relations observed in molecular outflows. We explain how many recent observational results disagree with the predictions of non-episodic outflow models, and we offer simple explanations for the discrepancies. In particular, we discuss how an episodic stellar outflow can steepen the power-law slope of the mass-velocity relation in a molecular outflow. And, we illustrate how an episodic outflow can produce multiple "Hubble-wedges'' in the position-velocity distribution of a molecular outflow. With a little more information than we have now, it may be possible to use the "fossil record" embedded in a molecular outflow's mass-velocity and position-velocity relations to reconstruct the history of a young stellar object's mass ejection episodes.
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