High-energy particle acceleration by explosive electromagnetic interaction in an accretion disk
High-energy particle acceleration by explosive electromagnetic interaction in an accretion disk
复制标题
吸积盘中爆炸性电磁相互作用的高能粒子加速
DOI：
10.1086/172081
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
J. Sakai
中科院分区：
文献类型：
--
作者：
C. Haswell;T. Tajima;J. Sakai
通过研究致密物体周围吸积盘中发生的电磁场演化，我们得出了粒子加速的爆炸机制。差动旋转圆盘中的磁通冻结导致种子和/或产生的磁场紧密包裹，变得高度剪切，并且在取向上局部以方位为主。我们展示了由于吸积流驱动流体方程的结果，孤立等离子体团中电磁场的渐近非线性解是如何产生的。这些磁场能够快速加速来自圆盘的带电粒子。从活动星系核通过目前的机制加速可以产生超过10exp 20 eV的能量。这样的机制可能会为最高能量的观测宇宙射线的河外起源提供解释。
By examining electromagnetic field evolution occurring in an accretion disk around a compact object, we arrive at an explosive mechanism of particle acceleration. Flux-freezing in the differentially rotating disk causes the seed and/or generated magnetic field to wrap up tightly, becoming highly sheared and locally predominantly azimuthal in orientation. We show how asymptotically nonlinear solutions for the electromagnetic fields may arise in isolated plasma blobs as a result of the driving of the fluid equations by the accretion flow. These fields are capable of rapidly accelerating charged particles from the disk. Acceleration through the present mechanism from AGN can give rise to energies beyond 10 exp 20 eV. Such a mechanism may present an explanation for the extragalactic origin of the most energetic observed cosmic rays.