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Constraints on pulsed emission model for repeating FRB 121102

机译：用于重复FRB 121102的脉冲发射模型的约束

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摘要

Recent localization of the repeating fast radio burst (FRB) 121102 revealed the distance of its host galaxy and luminosities of the bursts. We investigated constraints on the young neutron star (NS) model, that (a) the FRB intrinsic luminosity is supported by the spin-down energy, and (b) the FRB duration is shorter than the NS rotation period. In the case of a circular cone emission geometry, conditions (a) and (b) determine the NS parameters within very small ranges, compared with that from only condition (a) discussed in previous works. Anisotropy of the pulsed emission does not affect the area of the allowed parameter region by virtue of condition (b). The determined parameters are consistent with those independently limited by the properties of the possible persistent radio counterpart and the circumburst environments such as surrounding materials. Since the NS in the allowed parameter region is older than the spin-down timescale, the hypothetical GRP (giant radio pulse)-like model expects a rapid radio flux decay of less than or similar to 1 Jy within a few years as the spin-down luminosity decreases. The continuous monitoring will provide constraints on the young NS models. If no flux evolution is seen, we need to consider an alternative model, e.g., the magnetically powered flare.
机译：最近对重复快速射电爆发（FRB）121102的定位揭示了其宿主星系的距离和爆发的光度。我们研究了年轻中子星（NS）模型的约束条件，即（a）FRB内禀光度由自旋下降能量支持，（b）FRB持续时间短于NS自转周期。在圆锥体发射几何体的情况下，条件（a）和（b）在非常小的范围内确定NS参数，与之前工作中讨论的仅条件（a）相比。根据条件（b），脉冲发射的各向异性不会影响允许参数区域的面积。确定的参数与可能的持久射电对应物和周围物质等环爆环境的性质独立限制的参数一致。由于允许的参数区域中的NS比自旋下降时间尺度更老，假设的GRP（巨射电脉冲）模型预计，随着自旋下降光度的降低，在几年内，射电通量会迅速衰减，小于或类似于1 Jy。持续监控将对年轻的NS模型提供约束。如果没有看到通量演化，我们需要考虑另一个模型，例如，磁动力耀斑。

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