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arXiv 2111.09548astro-ph.HE
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快速射电暴径频映射的三个方面

Three aspects of the radius-to-frequency mapping in fast radio bursts

H. Tong, J. Liu, H. G. Wang, Z. Yan

摘要:

我们进一步探讨了FRB情况下的半径-频率映射。对Lyutikov(2020)进行了分析处理。得到了漂移速率和漂移时间尺度的频率依赖关系。像差效应和磁场线的扭曲可导致在两个方向上的漂移。对于一个FRB,根据半径到频率的映射,突发宽度在较低频率处较大。对于FRB群体,中继器的磁场可以大于非中继器的磁场。然后,根据半径到频率的映射,中继器的突发宽度将比表观非中继器的突发宽度更宽。如果类似的窗口函数(或发射锥),如双星和磁星的窗口函数也在FRB的情况下工作,那么窗口函数可以解释FRB配置文件的单个或多个组件。半径到频率映射建模在某种程度上独立于基础无线电发射机制。

英文摘要:

We further explored the radius-to-frequency mapping in cases of FRBs. An analytical treatment of Lyutikov (2020) is presented. The frequency dependence of the drifting rate and the drifting timescale are obtained. The aberration effect and the twist of the magnetic field lines may result in drifting in both directions. For one FRB, the burst width is larger at lower frequency according to the radius-to-frequency mapping. For the FRB population, the magnetic fields of the repeaters may be larger than that of the non-repeaters. Then, according to the radius-to-frequency mapping, the burst widths of the repeaters will be wider than that of the apparent non-repeaters. If similar window function (or emission cones) like that of pulsars and magnetars is also at work in the case of FRBs, then the window function may explain the single or multiple components of FRB profiles. The radius-to-frequency mapping modeling is to some degree independent of the underlying radio emission mechanism.

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