Particle Acceleration Driven by Null Electromagnetic Fields Near a Kerr Black Hole
Particle Acceleration Driven by Null Electromagnetic Fields Near a Kerr Black Hole
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DOI：
10.3390/universe7010001
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发表时间：
2020-11
期刊：
影响因子：
2.9
通讯作者：
Y. Kojima;Y. Kimura
中科院分区：
文献类型：
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作者：
Y. Kojima;Y. Kimura
短时间尺度的变化通常与黑洞系统有关。假设克尔黑洞附近突然产生的电磁流出是由一个零电流的无力场的解描述的，则考虑了这种电磁流出的后果。我们计算了由爆发场引起的带电粒子加速度。我们证明了粒子被具有很大振幅的场瞬间加速到相对论区域，其特征在于无量纲数κ。我们的数值计算演示了粒子的轨迹如何随κ变化。我们还表明，最大能量随κ2/3的增加而增加。在超大质量黑洞附近发生的事件中，质子获得的典型最大能量是Emax 100 TeV，这是足够观测到的高能耀斑。
Short timescale variability is often associated with a black hole system. The consequence of an electromagnetic outflow suddenly generated near a Kerr black hole is considered assuming that it is described by a solution of a force-free field with a null electric current. We compute charged particle acceleration induced by the burst field. We show that the particle is instantaneously accelerated to the relativistic regime by the field with a very large amplitude, which is characterized by a dimensionless number κ. Our numerical calculation demonstrates how the trajectory of the particle changes with κ. We also show that the maximum energy increases with κ2/3. The typical maximum energy attained by a proton for an event near a super massive black hole is Emax∼100 TeV, which is enough observed high-energy flares.