A comparison of the acceleration mechanisms in young stellar objects and active galactic nuclei jets
A comparison of the acceleration mechanisms in young stellar objects and active galactic nuclei jets
复制标题
年轻恒星和活跃星系核喷流加速机制的比较
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. King
中科院分区：
文献类型：
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作者：
Daniel J. Price;J. Pringle;A. King
我们研究的假设，存在一个简单的缩放之间的观测速度发现在年轻的恒星物体（YSO）和喷气机发现在活动星系核（AGN）的喷气机。我们采用了一个非常简化的物理模型的射流加速过程。我们在牛顿和相对论引力场中使用时间相关的球对称风模型，来研究在YSO中观测到的喷流速度（大约是中心物体逃逸速度的2倍）所需的能量输入率是否也能产生活动星系核喷流速度（洛伦兹因子为γ 1/10）。如果有一个共同的生产机制，这种规模是可以预期的。我们证明，这样的缩放确实存在，只要能量输入过程发生足够深的引力势阱，使物理使用的光速作为限制速度，并提供在吸积过程中释放的能量被赋予一小部分可用的吸积材料。
We examine the hypothesis that there exists a simple scaling between the observed velocities of jets found in young stellar objects (YSOs) and jets found in active galactic nuclei (AGN). We employ a very simplified physical model of the jet acceleration process. We use timedependent, spherically symmetric wind models in Newtonian and relativistic gravitational fields to ask whether the energy input rates required to produce the jet velocities observed in YSOs (of approximately 2 × the escape velocity from the central object) can also produce AGN jet velocities (Lorentz factors of γ ∼ 10). Such a scaling would be expected if there is a common production mechanism for such jets. We demonstrate that such a scaling does exist, provided that the energy input process takes place sufficiently deep in the gravitational potential well, enabling physical use to be made of the speed of light as a limiting velocity, and provided that the energy released in the accretion process is imparted to a small fraction of the available accreting material.