论文标题
快速无线电爆发的红移估计值以及对白术磁场的影响
Redshift estimates for fast radio bursts and implications on intergalactic magnetic fields
论文作者
论文摘要
上下文：快速无线电爆发是来自紧凑型恒星源的瞬时无线电脉冲。随着新的望远镜每天检测多个事件，需要使用统计方法来解释观察结果并推断出关于天体物理和宇宙学问题。 目的：我们提出了一种使用快速无线电爆发可观察物的概率估计的方法，以获得基础模型的似然估计。 方法：考虑沿视线的所有区域的模型，包括中间的星系，我们进行蒙特卡罗模拟，以估计分散度度量，旋转度量和时间扩展的分布。使用贝叶斯统计，我们将这些预测与快速无线电爆发的观察进行了比较。 结果：通过应用贝叶斯定理，我们在快速无线电爆发的红移上获得了下限，并带有外层次DM $ \ gtrsim 400 $ PC CM $^{ - 3} $。我们发现，中间的星系无法说明FRBCAT中所有高度散射的快速无线电爆发，因此比SGR 1935+2154样磁场需要更密集，更动荡的环境。我们表明，$ \ gtrsim 10^3 $的样本未估量的快速无线电爆发，并具有相关的外层次rm $ \ geq 1 $ rad m $^{ - 2} $可以改善当前上限磁场强度的上限。
Context: Fast Radio Bursts are transient radio pulses from presumably compact stellar sources of extragalactic origin. With new telescopes detecting multiple events per day, statistical methods are required in order to interpret observations and make inferences regarding astrophysical and cosmological questions. Purpose: We present a method that uses probability estimates of fast radio burst observables to obtain likelihood estimates for the underlying models. Method: Considering models for all regions along the line-of-sight, including intervening galaxies, we perform Monte-Carlo simulations to estimate the distribution of the dispersion measure, rotation measure and temporal broadening. Using Bayesian statistics, we compare these predictions to observations of Fast Radio Bursts. Results: By applying Bayes theorem, we obtain lower limits on the redshift of Fast Radio Bursts with extragalactic DM $\gtrsim 400$ pc cm$^{-3}$. We find that intervening galaxies cannot account for all highly scattered Fast Radio Bursts in FRBcat, thus requiring a denser and more turbulent environment than a SGR 1935+2154-like magnetar. We show that a sample of $\gtrsim 10^3$ unlocalized Fast Radio Bursts with associated extragalactic RM $\geq 1$ rad m$^{-2}$ can improve current upper limits on the strength of intergalactic magnetic fields.
