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arXiv 1601.06131astro-ph.HEastro-ph.CO
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FRB的中子星祖先?偏振测量的见解

A neutron star progenitor for FRBs? Insights from polarisation measurements

Vikram Ravi, Paul D. Lasky

摘要:

快速射电暴(FRB)是一种强烈的毫秒级宽带射电瞬变现象,其发射机制尚不清楚。Masui等人最近提出了绿岸望远镜对FRB 110523的观测,显示了线性偏振位置角(PA)的时间变化。这种效应在射电望远镜中很常见,是由于当恒星旋转时,发射区的投影磁场方向发生变化。如果一个中子星是这个FRB的祖先,和发射机制是脉冲星一样,我们表明,祖先是快速旋转,或发射起源于一个复杂的磁场几何形状的区域。所观察到的PA变化也可能是由中子星磁层内的传播效应引起的,或者是由空间变化的磁场引起的,如果祖星位于一个密集的、高度磁化的环境中。虽然我们敦促谨慎概括FRB 110523的结果,更广泛的FRB人口,我们的分析作为一个指南来解释未来的偏振测量FRB,并提出了另一种手段来阐明这些神秘的蜉蝣的起源。

英文摘要:

Fast Radio Bursts (FRBs) are intense, millisecond-duration broadband radio transients, the emission mechanisms of which are not understood. Masui et al. recently presented Green Bank Telescope observations of FRB 110523, which displayed temporal variation of the linear polarisation position angle (PA). This effect is commonly seen in radio pulsars and is attributed to a changing projected magnetic field orientation in the emission region as the star rotates. If a neutron star is the progenitor of this FRB, and the emission mechanism is pulsar-like, we show that the progenitor is either rapidly rotating, or the emission originates from a region of complex magnetic field geometry. The observed PA variation could also be caused by propagation effects within a neutron-star magnetosphere, or by spatially varying magnetic fields if the progenitor lies in a dense, highly magnetised environment. Although we urge caution in generalising results from FRB 110523 to the broader FRB population, our analysis serves as a guide to interpreting future polarisation measurements of FRBs, and presents another means of elucidating the origins of these enigmatic ephemera.

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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