具有非顶帽速度截面的团状出流中的速度分离
Velocity segregation in a clump-like outflow with a non-top hat velocity cross-section
摘要：
在某些行星状星云和恒星形成区的某些外流中，观测到了通过发射与外流源结合的高速团块，其径向速度随距离线性增加的“哈勃定律“斜坡。我们提出了一个简单的模型，其中一个“团块”是从一个源喷射超过一个周期$τ_0$，具有较强的轴向边缘速度分层。这种非顶帽形截面导致产生高度弯曲的工作表面（最初被喷射材料推动，随后由于其惯性而滑行）。从分析模型和数值模拟，我们发现，这个工作面有一个线性速度与位置斜坡，因此再现了定性的方式“哈勃定律团块”的行星状星云和年轻恒星的外流。
英文摘要：
High velocity clumps joined to the outflow source by emission with a "Hubble law" ramp of linearly increasing radial velocity vs. distance are observed in some planetary nebulae and in some outflows in star formation regions. We propose a simple model in which a "clump" is ejected from a source over a period $τ_0$, with a strong axis to edge velocity stratification. This non-top hat cross section results in the production of a highly curved working surface (initially being pushed by the ejected material, and later coasting along due to its inertia). From both analytic models and numerical simulations we find that this working surface has a linear velocity vs. position ramp, and therefore reproduces in a qualitative way the "Hubble law clumps" in planetary nebulae and outflows from young stars.
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