论文标题
通过他们的主机银河系人口统计，面对快速无线电爆发的磁性解释
Confronting the Magnetar Interpretation of Fast Radio Bursts Through Their Host Galaxy Demographics
论文作者
论文摘要
我们在快速无线电爆发（FRB）主机星系人口统计和偏移分布的上下文中探索迅速的磁铁祖细胞场景。磁铁是中子星，具有强烈的磁场，订单为$ 10^{15} $ g，短期衰减寿命低于$ 10^4美元。由于它们的寿命极短，磁铁应根据当前的恒星形成率（SFR）遵循星系的人口统计。此外，我们假设磁铁应遵循星系中的SFR曲线，我们假设它遵循指数曲线。假设这些事件在所有星系中跟踪SFR，并将其与从\ nsecure \ secure \ secure frb主体样本中观察到的属性，我们为磁铁的宿主星系构建了一个简单的模型。我们发现观察到的SFR的分布与该型号的$> 95 \％$c.l。偏移分布与这种情况一致；但是，这可能是由于样本量有限以及对FRB宿主星系有效半径的估计值有限。尽管FRB最近与银河系中的磁性有关联，但磁铁可能不是宇宙中FRB的唯一来源，但是任何其他成功的模型都必须考虑SFR中FRB宿主的人口统计以及他们观察到的中心偏移。
We explore the prompt magnetar progenitor scenario in the context of fast radio burst (FRB) host galaxies demographics and offset distributions. Magnetars are neutron stars with strong magnetic fields on the order of $10^{15}$ G with a short decay lifetime of less than $10^4$ years. Due to their extremely short lifetimes, magnetars should follow the demographics of galaxies according to their current star-formation rate (SFR). Moreover, we hypothesize that magnetars should follow the SFR profile within galaxies, which we assume to follow an exponential profile. We construct a simple model for the host galaxies of magnetars assuming these events track SFR in all galaxies and compare it to observed properties from a sample of \nsecure\ secure FRB hosts. We find the distribution of observed SFRs is inconsistent with the model at $>95\%$ c.l. The offset distribution is consistent with this scenario; however, this could be due to the limited sample size and the seeing limited estimates for the effective radii of the FRB host galaxies. Despite the recent association of an FRB with a magnetar in the Milky Way, magnetars may not be the only source of FRBs in the universe, yet any other successful model must account for the demographics of the FRB host in SFR and their observed galactocentric offsets.
