Abstract

Recently, CHIME/FRB project published its first fast radio burst (FRB) catalog (hereafter, Catalog 1), which contains in total 536 unique bursts. With the help of the latest set of FRBs in this large-size catalog, we aim to investigate the dispersion measure (DM) or redshift (\(z\)) distribution of the FRB population, and solution of this problem could be used to clarify the question of FRB origin. In this study, we adopted the M&E 2018 model to fit the observed \(z\) distribution of FRBs in Catalog 1. In the M&E 2018 model, we are mostly interested in the \(\Phi (z)\) function, i.e., number of bursts per proper time per comoving volume, which is represented by the star formation rate (SFR) with a power-law index \(n\). Our estimated value of \(n\) is \(0.0_{{ - 0.0}}^{{ + 0.6}}\) (\(0.0_{{ - 0.0}}^{{ + 2.1}}\)) at the 68 (95) per cent confidence level, implying that the FRB population evolves with redshift consistent with, or faster than, the SFR. Specially, the consistency of the \(n\) values estimated by this study and the SFR provides a potential support for the hypothesis of FRBs originating from young magnetars.

中文翻译：

---

CHIME/FRB 目录 1 中快速射电暴色散测量的分布：对 FRB 起源的影响

摘要

最近，CHIME/FRB 项目发布了第一个快速射电暴 (FRB) 目录（以下简称目录 1），其中总共包含 536 个独特的爆发。借助这个大型目录中的最新一组 FRB，我们旨在研究 FRB 种群的色散测量 (DM) 或红移 (\(z\) )分布，并且该问题的解决方案可用于澄清 FRB 起源的问题。在本研究中，我们采用 M&E 2018 模型来拟合目录 1 中观察到的FRB 的\(z\)分布。在 M&E 2018 模型中，我们最感兴趣的是\(\Phi (z)\)函数，即，每个共动体积每个本征时间的爆发数，由具有幂律指数\(n\)的恒星形成率 (SFR) 表示. 我们对\(n\)的估计值为\ (0.0_{{ - 0.0}}^{{ + 0.6}}\) ( \(0.0_{{ - 0.0}}^{{ + 2.1}}\) )在 68 (95)% 的置信水平，这意味着 FRB 种群的红移演化与恒星形成率一致或更快。特别地，本研究估计的\(n\)值与恒星形成率的一致性为快速射电暴起源于年轻磁星的假设提供了潜在支持。