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arXiv 2501.04768astro-ph.HE
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从原中子星发电机到低场磁星

From proto-neutron star dynamo to low-field magnetars

Andrei Igoshev, Paul Barrère, Raphaël Raynaud, Jérome Guilet, Toby Wood, Rainer Hollerbach

AI总结:

通过首次模拟发电机产生磁场后的磁热演化,研究提出低场磁星源于原中子星内的 Tayler–Spruit 发电机,并解释其弱偶极场、强小尺度场及 X 射线爆发。

摘要:

低场磁星的偶极磁场比用于定义经典磁星的阈值 B ≳ 10^14 G 弱 10–100 倍,但它们会产生类似的 X 射线爆发和耀发。利用首次从发电机产生的磁场出发的磁热演化直接数值模拟,我们表明低场磁星可以由原中子星内部的 Tayler–Spruit 发电机产生。我们发现,这些模拟自然解释了低场磁星的关键特征:(1)弱(≲10^13 G)偶极磁场;(2)强小尺度磁场;以及(3)磁诱发的地壳破裂产生 X 射线爆发。这些发现表明,经典磁星和低场磁星存在两种不同的形成通道,并可能与不同的发电机机制相关。

英文摘要:

Low-field magnetars have dipolar magnetic fields that are 10-100 times weaker than the threshold, $B \gtrsim 10^{14}$ G, used to define classical magnetars, yet they produce similar X-ray bursts and outbursts. Using the first direct numerical simulations of magneto-thermal evolution starting from a dynamo-generated magnetic field, we show that the low-field magnetars can be produced as a result of a Tayler--Spruit dynamo inside the proto-neutron star. We find that these simulations naturally explain key characteristics of low-field magnetars: (1) weak ($\lesssim 10^{13}$ G) dipolar magnetic fields, (2) strong small-scale fields, and (3) magnetically induced crustal failures producing X-ray bursts. These findings suggest two distinct formation channels for classical and low-field magnetars, potentially linked to different dynamo mechanisms.

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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