Particle acceleration in relativistic current sheets.
Particle acceleration in relativistic current sheets.
复制标题
相对论电流片中的粒子加速。
作者：
J. Kirk
相对论性电流片被认为是脉冲星风、活动星系喷流和其他坡印廷流主导流中耗散的场所。结果表明，这些结构的稳定版本不同于他们的非相对论性的同行，因为他们不允许变换到一个零电场的德霍夫曼-泰勒框架。相反，它们的一般形式是真正的中性片，没有垂直于片的链接磁场分量。这种结构可以加速粒子的最大能量的推导，并用于计算随后的同步辐射的最大频率。这可能大大超过标准估计。在磁驱动的伽马射线爆发的情况下，电子的加速是可能的能量足以使光子-光子对的生产后，逆康普顿散射事件。
Relativistic current sheets have been proposed as the sites of dissipation in pulsar winds, jets in active galaxies, and other Poynting flux dominated flows. It is shown that the steady versions of these structures differ from their nonrelativistic counterparts because they do not permit transformation to a de Hofmann-Teller frame with zero electric field. Instead, their generic form is that of a true neutral sheet with no linking magnetic field component normal to the sheet. The maximum energy to which such structures can accelerate particles is derived, and used to compute the maximum frequency of the subsequent synchrotron radiation. This can be substantially in excess of standard estimates. In the magnetically driven gamma-ray burst scenario, acceleration of electrons is possible to energies sufficient to enable photon-photon pair production after an inverse Compton scattering event.