Host Galaxy Dispersion Measure of Fast Radio Burst

TL;DR

This paper estimates the host galaxy dispersion measure of 22 fast radio bursts using physical models, revealing its increase with redshift and differences between repeaters and non-repeaters, shedding light on their local environments.

Contribution

It introduces a method to derive host galaxy dispersion measures from known physical models and analyzes their relation to redshift and burst type.

Findings

Host galaxy dispersion measure increases with redshift.

Different distributions of host dispersion measures between repeaters and non-repeaters.

Local environment differences may explain divergence in host dispersion measures.

Abstract

Fast radio bursts are a class of transient radio sources that are thought to originate from extragalactic sources since their dispersion measure greatly exceeds the highest dispersion measure that the Milky Way interstellar medium can provide. Host Galaxies of twenty-two fast radio bursts have already been identified. In this paper, the dispersion measurement of these fast radio bursts produced by the Milky Way interstellar medium, and the intergalactic medium is obtained through known physical models to yield the host galaxy dispersion measure. It is observed that the host galaxy dispersion measure increases with its redshift value. We also obtained that the host galaxy dispersion measure has different distribution between repeaters and non-repeaters. It is noted that the reason for the divergence of the host galaxy dispersion measures should be accounted for by the difference in their local environment.