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arXiv 2201.08345astro-ph.HE
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中子星壳的磁场演化:超越霍尔效应

Magnetic Field Evolution in Neutron Star Crusts: Beyond the Hall Effect

Konstantinos N. Gourgouliatos, Davide De Grandis, Andrei Igoshev

摘要:

中子星拥有我们所知的宇宙中最强的磁场。它们的磁场是产生其辐射的主要手段,无论是磁层还是通过地壳。此外,磁场的演化与磁星的爆炸事件密切相关,磁星拥有强磁场,并且它们持续的热辐射。在霍尔效应和欧姆耗散的框架内描述了中子星壳层中磁场的演化。然而,这种描述是有限的事实,麦克斯韦应力施加在外壳上的强磁化中子星可能会导致故障和温度变化。在前一种情况下,破裂的地壳并不完全满足霍尔效应的必要条件。在后者中,温度的变化与磁场的演化密切相关。最后,恒星温度的急剧梯度可能会激活电池项,改变磁场结构,特别是在弱磁化的中子星中。在本文中,我们讨论了这些影响的最新进展。我们认为,这些现象可能会提供新的见解,我们的理解中子星和它们的可观察的属性。

英文摘要:

Neutron stars host the strongest magnetic fields that we know of in the Universe. Their magnetic fields are the main means of generating their radiation, either magnetospheric or through the crust. Moreover, the evolution of the magnetic field has been intimately related to explosive events of magnetars, which host strong magnetic fields, and their persistent thermal emission. The evolution of the magnetic field in the crusts of neutron stars has been described within the framework of the Hall effect and Ohmic dissipation. Yet, this description is limited by the fact that the Maxwell stresses exerted on the crusts of strongly magnetised neutron stars may lead to failure and temperature variations. In the former case, a failed crust does not completely fulfil the necessary conditions for the Hall effect. In the latter, the variations of temperature are strongly related to the magnetic field evolution. Finally, sharp gradients of the star's temperature may activate battery terms and alter the magnetic field structure, especially in weakly magnetised neutron stars. In this review, we discuss the recent progress made on these effects. We argue that these phenomena are likely to provide novel insight into our understanding of neutron stars and their observable properties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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