Comparison of the Parkes and FAST FRB DM Distribution

Abstract

We model the Fast Radio Burst (FRB) dispersion measure (DM) distribution for the Five-hundred-meter Aperture Spherical Telescope (FAST) and compare this with the four FRBs published in the literature to date. We compare the DM distribution of Parkes and FAST, taking advantage of the similarity between their multibeam receivers. Notwithstanding the limited sample size, we observe a paucity of events at low DM for all evolutionary models considered, resulting in a sharp rise in the observed cumulative distribution function (CDF) in the region of $1000\lesssim \mathrm{DM}\lesssim 2000$ pc cm${}^{-3}$. These traits could be due to statistical fluctuations ($0.12\le p\le 0.22$), a complicated energy distribution or break in an energy distribution power law, spatial clustering, observational bias or outliers in the sample (e.g., an excessive DM_$HOST$ as recently found for FRB 20190520B). The energy distribution in this regime is unlikely to be adequately constrained until further events are detected. Modelling suggests that FAST may be well placed to discriminate between redshift evolutionary models and to probe the helium ionisation signal of the IGM.

8 pages, 2 figures. Published in MNRAS

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• The Fast Radio Burst Population Energy Distribution
• Distribution of fast radio burst dispersion measures in CHIME/FRB Catalog 1: implications on the origin of FRBs