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Pré-Publication, Document De Travail Année : 2024

Dispersion Measures of Fast Radio Bursts through the Epoch of Reionization

Résumé

Dispersion measures (DM) of fast radio bursts (FRBs) probe the density of electrons in the intergalactic medium (IGM) along their lines-of-sight, including the average density versus distance to the source and its variations in direction. While previous study focused on low-redshift, FRBs are potentially detectable out to high redshift, where their DMs can, in principle, probe the epoch of reionization (EOR) and its patchiness. We present the first predictions from large-scale, radiation-hydrodynamical simulation of fully-coupled galaxy formation and reionization, using Cosmic Dawn (``CoDa")~II to model the density and ionization fields of the universe down to redshifts through the end of the EOR at zre6.1. Combining this with an N-body simulation CoDa~II--Dark Matter of the fully-ionized epoch from the EOR to the present, we calculate the mean and standard deviation of FRB DMs as functions of their source redshift. The mean and standard deviation of DM increase with redshift, reaching a plateau by z(xHII0.25)8, i.e. well above zre. The mean-DM asymptote DMmax5900 pccm3 reflects the end of the EOR and its duration. The standard deviation there is σDM,max497 pccm3, reflecting inhomogeneities of both patchy reionization and density. Inhomogeneities in ionization during the EOR contribute O(1 per cent) of this value of σDM,max from FRBs at redshifts z8. Current estimates of FRB rates suggest this may be detectable within a few years of observation.

Dates et versions

hal-04796119 , version 1 (21-11-2024)

Identifiants

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Joshua J Ziegler, Paul R Shapiro, Taha Dawoodbhoy, Paz Beniamini, Pawan Kumar, et al.. Dispersion Measures of Fast Radio Bursts through the Epoch of Reionization. 2024. ⟨hal-04796119⟩
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