论文标题
相对论剪切流中以重新连接驱动的粒子加速度
Reconnection-driven particle acceleration in relativistic shear flows
论文作者
论文摘要
调用剪切流中的粒子能量来解释相对论天体物理喷气器边界的非热发射。然而，颗粒注射的物理学，即允许热颗粒参与剪切驱动的加速度的机制，仍然未知。通过粒子中的模拟，我们研究了通过相对论磁性的电子质子射流和弱磁化的电子环境气质之间的速度剪切底种植的开尔文 - 螺旋（KH）不稳定性的发展。我们表明，在其非线性阶段，KH涡流会产生动力学的重新连接层，从而有效地为射流颗粒供电，从而为颗粒注射到剪切驱动的加速度提供了一种第一原理机制。我们的工作为喷气发射的脊柱鞘模型提供了支持 - 快速核/脊柱被较慢的鞘包围 - 可以解释相对论喷气机边界上发射电气发射电子的起源。
Particle energization in shear flows is invoked to explain non-thermal emission from the boundaries of relativistic astrophysical jets. Yet, the physics of particle injection, i.e., the mechanism that allows thermal particles to participate in shear-driven acceleration, remains unknown. With particle-in-cell simulations, we study the development of Kelvin-Helmholtz (KH) instabilities seeded by the velocity shear between a relativistic magnetically-dominated electron-positron jet and a weakly magnetized electron-ion ambient plasma. We show that, in their nonlinear stages, KH vortices generate kinetic-scale reconnection layers, which efficiently energize the jet particles, thus providing a first-principles mechanism for particle injection into shear-driven acceleration. Our work lends support to spine-sheath models of jet emission - with a fast core/spine surrounded by a slower sheath - and can explain the origin of radio-emitting electrons at the boundaries of relativistic jets.
