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A First-principle Model for Polarization Swings during Reconnection-powered Flares
The Astrophysical Journal Letters ( IF 7.9 ) Pub Date : 2020-09-03 , DOI: 10.3847/2041-8213/abafa6
David N. Hosking 1, 2 , Lorenzo Sironi 3
Affiliation  

We show that magnetic reconnection in a magnetically dominated fast-cooling plasma can naturally produce bright flares accompanied by rotations in the synchrotron polarization vector. With particle-in-cell simulations of reconnection, we find that flares are powered by efficient particle acceleration at the interface of merging magnetic flux ropes, or “plasmoids.” The accelerated particles stream through the post-merger plasmoid toward the observer, thus progressively illuminating regions with varying plane-of-sky field direction, and so leading to a rotation in the observed polarization vector. Our results provide evidence for magnetic reconnection as the physical cause of high-energy flares from the relativistic jets of blazars (which recent observations have shown to be frequently associated with polarization rotations), and provide a first-principle physical mechanism for such flares.

中文翻译:

重新连接动力弹的极化摆动的第一性原理模型

我们表明,在以磁性为主的快速冷却等离子体中进行磁性重连接可以自然地产生明亮的耀斑,并伴随着同步加速器极化矢量的旋转。通过重新连接的单元格内粒子模拟,我们发现耀斑由合并磁通量绳索或“等离子体”界面处的有效粒子加速提供动力。加速的粒子流过合并后的等离子体,流向观察者,从而逐渐照亮具有变化的天空平面场方向的区域,从而导致观察到的偏振向量发生旋转。我们的研究结果为磁重联提供了证据,磁重联是相对论的blazar射流引起的高能耀斑的物理原因(最近的观察表明,这经常与极化旋转有关),
更新日期:2020-09-05
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