论文标题
ASKAP快速无线电爆发中脉搏扩大的种群分析
A population analysis of pulse broadening in ASKAP Fast Radio Bursts
论文作者
论文摘要
快速无线电爆发（FRB）的脉冲形态在理解祖细胞物理和爆发传播的血浆介质方面提供了关键信息。我们介绍了澳大利亚平方公里阵列探路者检测到的33个明亮FRB的轮廓的研究。我们识别出具有可测量内在脉冲宽度的七个FRB，其中包括已看到重复的两个FRB。在我们适度的样本中，我们没有看到脉冲宽度分布中双峰性的证据。我们还鉴定出五个FRB，具有毫秒的时间尺度脉冲扩大的证据，这是由于散射不均匀等离子体引起的。我们没有发现脉搏扩大与乳乳外分散措施之间存在关系的证据。散射可能是由宿主星系中极端的湍流引起的，或者通过前景星系传播的机会传播。通过对宿主星系特性的未来高时间分辨率观测和详细研究，我们可能能够在Gigaparsec量表上探测视线湍流。
The pulse morphology of fast radio bursts (FRBs) provides key information in both understanding progenitor physics and the plasma medium through which the burst propagates. We present a study of the profiles of 33 bright FRBs detected by the Australian Square Kilometre Array Pathfinder. We identify seven FRBs with measureable intrinsic pulse widths, including two FRBs that have been seen to repeat. In our modest sample we see no evidence for bimodality in the pulse width distribution. We also identify five FRBs with evidence of millisecond timescale pulse broadening caused by scattering in inhomogeneous plasma. We find no evidence for a relationship between pulse broadening and extragalactic dispersion measure. The scattering could be either caused by extreme turbulence in the host galaxy or chance propagation through foreground galaxies. With future high time resolution observations and detailed study of host galaxy properties we may be able to probe line-of-sight turbulence on gigaparsec scales.
