旋转相对论射流中的磁流体动力学效应：反向激波和磁加速
Magnetohydrodynamic Effects in Propagating Relativistic Jets: Reverse Shock and Magnetic Acceleration
摘要：
我们解决了一个任意磁化的相对论性流注入到一个静态的一维非磁化介质中的减速的黎曼问题。我们发现，在相同的初始洛伦兹因子下，反向激波随磁化强度σ（坡印廷能流与动能流之比）的增大而逐渐减弱，当σ超过临界值σ_c时，激波变为稀疏波。在稀疏波制度中，我们发现，稀疏区域被加速到一个洛伦兹因子，这是显着大于初始值。这种加速机制是由于流中的强磁压力。我们讨论了这些结果的影响模型的伽马射线暴和活动星系核。
英文摘要：
We solve the Riemann problem for the deceleration of an arbitrarily magnetized relativistic flow injected into a static unmagnetized medium in one dimension. We find that for the same initial Lorentz factor, the reverse shock becomes progressively weaker with increasing magnetization σ(the Poynting-to kinetic energy flux ratio), and the shock becomes a rarefaction wave when σexceeds a critical value, σ_c, defined by the balance between the magnetic pressure in the flow and the thermal pressure in the forward shock. In the rarefaction wave regime, we find that the rarefied region is accelerated to a Lorentz factor that is significantly larger than the initial value. This acceleration mechanism is due to the strong magnetic pressure in the flow. We discuss the implications of these results for models of gamma-ray bursts and active galactic nuclei.
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