Constraints on Pulsed Emission Model for Repeating FRB 121102
Constraints on Pulsed Emission Model for Repeating FRB 121102
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DOI：
10.1093/pasj/psx093
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
S. Kisaka;T. Enoto;S. Shibata
中科院分区：
文献类型：
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作者：
S. Kisaka;T. Enoto;S. Shibata
最近对重复的快速射电爆发（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星（NS）模型的约束条件，即（a）FRB的内禀光度是由自旋下降能量支持的，（B）FRB的持续时间短于NS旋转周期。在圆锥发射几何形状的情况下，条件（a）和（B）在非常小的范围内确定NS参数，与以前的工作中讨论的仅来自条件（a）的NS参数相比。由于条件（B），脉冲发射的各向异性不影响允许参数区域的面积。所确定的参数是一致的那些独立的限制可能的持久无线电对应物的属性和环暴环境，如周围的材料。由于允许参数区域的NS比自旋下降时间尺度更老，假设的GRP类模型预计随着自旋下降光度的降低，几年内无线电通量将快速衰减。连续监测将给出模型区分的提示。如果没有看到通量演变，我们需要考虑替代模型，例如，磁力耀斑
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-like model expects a rapid radio flux decay of $\lesssim1$ Jy within a few years as the spin-down luminosity decreases. The continuous monitoring will give a hint of discrimination of the models. If no flux evolution will be seen, we need to consider an alternative model, e.g., the magnetically powered flare.