论文标题
大自然是否使用中性束在紧凑物体周围加热星际等离子体？
Does Nature use neutral beams for interstellar plasma heating around compact objects?
论文作者
论文摘要
所有主要的托卡马克设施中都采用了中性束注射技术，用于加热磁性限制的血浆。然后出现了这个问题，类似的机制是否可能在天体物理对象中起作用？例如，超级埃德丁顿银河系二进制SS433具有Baryonic射流，以光速的四分之一移动，观察结果揭示了在Sub-PC尺度上的气体冷却和重组的迹象，并且在更大尺度上$ \ sim $ 100 PC上的强大能量沉积的强大能量沉积迹象同样强。在这里，我们考虑了一个中性原子传输这种能量的模型。中性原子的亚相关性束穿透了星际培养基，这些原子逐渐将其电离并沉积在一个区域上，其纵向尺寸由“电离长度”设定。能量沉积的通道将侧向扩展并沿侧向驱动冲击。一旦通道中的密度下降，梁的加热速率将相应地下降，并且能量释放的区域沿着梁的方向移动。我们讨论了与这种情况相关的不同特征，并推测这种配置还可能会增加由于冲击上游和下游的中性原子电离而产生的“拾取”质子的冲击加速度。
A neutral beam injection technique is employed in all major TOKAMAK facilities for heating of magnetically confined plasma. The question then arises, whether a similar mechanism might work in astrophysical objects? For instance, a hyper-Eddington galactic binary SS433 possesses baryonic jets, moving at a quarter of the speed of light, and observations revealed signs of gas cooling and recombination on sub-pc scales and equally strong signs of powerful energy deposition on much larger scales $\sim$100 pc. Here we consider a model where neutral atoms transport this energy. A sub-relativistic beam of neutral atoms penetrates the interstellar medium, these atoms gradually get ionised and deposit their energy over a region, whose longitudinal dimension is set by the "ionisation length". The channel, where the energy is deposited, expands sideways and drives a shock in the lateral direction. Once the density in the channel drops, the heating rate by the beam drops accordingly, and the region of the energy release moves along the direction of the beam. We discuss distinct features associated with this scenario and speculate that such configuration might also boost shock acceleration of the "pick-up" protons that arise due to ionisation of neutral atoms both upstream and downstream of the shock.
