Asking Fast Radio Bursts (FRBs) for More than Reionization History

Shaw, Abinash Kumar; Ghara, Raghunath; Beniamini, Paz; Zaroubi, Saleem; Kumar, Pawan

Asking Fast Radio Bursts (FRBs) for More than Reionization History

Sep 5, 2024

18 pages

e-Print:

2409.03255 [astro-ph.CO]

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Abstract: (arXiv)

We propose different estimators to probe the epoch of reionization (EoR) intergalactic medium (IGM) using the dispersion measure (

{\rm DM}

) of the FRBs. We consider three different reionization histories which we can distinguish with a total of

\lesssim 1000

{\rm DM}

measurements during EoR if their redshifts are known. We note that the redshift derivatives of

{\rm DM}

are also directly sensitive to the reionization history. The major point of this work is exploring the variance in the

{\rm DM}

measurements and the information encoded in them. We find that the all-sky average

\overline{{\rm DM}}(z)

gets biased from the LoS fluctuations in the

{\rm DM}

measurements introduced by the ionization of IGM during EoR. We find that the ratio

\sigma_{\rm DM}/\overline{{\rm DM}}

depends directly on the ionization bubble sizes as well as the reionization history. On the other hand, we also find that angular variance (coined as

structure

function

) of

{\rm DM}

encodes the information about the duration of reionization and the typical bubble sizes as well. We establish the usefulness of variances in

{\rm DM}

using toy models of reionization and later verify it with the realistic reionization simulations.

Note:

18 pages, 16 figures, Comments are welcome

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