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arXiv 2109.02524astro-ph.HE
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磁星耀斑的磁负荷

Magnetic loading of magnetars' flares

Maxim Lyutikov

摘要:

磁星是快速射电暴(FRB)的可能来源,它产生稳定的高度相对论磁化风和偶尔的喷射事件。我们证明了守恒的磁通量的要求占主导地位的磁爆炸的整体动力学。这是错过了在传统的流体动力学模型的喷射与参数增加的磁场,以及一维模型的磁扰动膨胀壳。爆炸的大部分初始自由能实际上都花在了拉伸其内部磁场上,同时对周围环境做了最小的$pdV$功。磁星的磁爆炸与靠近光柱的耀斑前风形成力平衡。然后,它们随着风安静地平流,或者作为电磁干扰传播。在风中不会产生强烈的冲击波。

英文摘要:

Magnetars, the likely sources of Fast Radio Bursts (FRBs), produce both steady highly relativistic magnetized winds, and occasional ejection events. We demonstrate that the requirement of conservation of the magnetic flux dominates the overall dynamics of magnetic explosions. This is missed in conventional hydrodynamic models of the ejections as expanding shell with parametrically added magnetic field, as well as one-dimensional models of magnetic disturbances. Most of the initial free energy of an explosion is actually spent on stretching its own internal magnetic field, while doing minimal $pdV$ work against the surrounding. Magnetic explosions from magnetars come into force balance with the pre-flares wind close to the light cylinder. They are then advected quietly with the wind, or propagate as electromagnetic disturbances. No powerful shock waves are generated in the wind.

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