标题： 快速射电暴的星系际和局部色散测量限制与CHIME/FRB远侧瓣事件 显示英文标题

标题： Constraints on the Intergalactic and Local Dispersion Measure of Fast Radio Bursts with the CHIME/FRB far side-lobe events

摘要： 我们研究了利用CHIME望远镜的远副瓣区域从2018年8月28日至2021年8月31日期间检测到的10个快速射电暴（FRB）。 我们发现，远副瓣事件的平均流量比在CHIME主瓣中检测到的事件高$\sim$500倍。 因此，我们表明副瓣样本在统计上比主瓣样本近$\sim$20倍。 在去除银河盘贡献后，来自NE2001模型的银河系自由电子密度分布中10个远副瓣和471个非重复主瓣FRB的CHIME/FRB第一版目录中的色散度量（DM）过剩分别为183.0和433.9 pc\;cm$^{-3}$。 通过在合理假设下比较这两个群体的DM过剩值，我们统计约束了对于NE2001模型，471个非重复主瓣FRB的局部退化贡献（来自银河晕和宿主星系）和星系际贡献分别为131.2$-$158.3和302.7$-$275.6 pc cm$^{-3}$，分别对应于主瓣FRB样本的中位红移$\sim$0.3。 这些限制对于FRB群体的研究非常有用，特别是用于限制缺失重子的位置。 显示英文摘要

摘要： We study the 10 fast radio bursts (FRBs) detected in the far side-lobe region of the CHIME telescope from 2018 August 28 to 2021 August 31. We find that the far side-lobe events have on average $\sim$500 times greater fluxes than events detected in CHIME's main lobe. We show that the side-lobe sample is therefore statistically $\sim$20 times closer than the main-lobe sample. The median dispersion measure (DM) excess, after removing the Galactic disk component using the NE2001 for the free electron density distribution of the Milky Way, of the 10 far side-lobe and 471 non-repeating main-lobe FRBs in the first CHIME/FRB catalog is 183.0 and 433.9 pc\;cm$^{-3}$, respectively. By comparing the DM excesses of the two populations under reasonable assumptions, we statistically constrain that the local degenerate contributions (from the Milky Way halo and the host galaxy) and the intergalactic contribution to the excess DM of the 471 non-repeating main-lobe FRBs for the NE2001 model are 131.2$-$158.3 and 302.7$-$275.6 pc cm$^{-3}$, respectively, which corresponds to a median redshift for the main-lobe FRB sample of $\sim$0.3. These constraints are useful for population studies of FRBs, and in particular for constraining the location of the missing baryons.