Constraining the state of the intergalactic medium during the Epoch of Reionization using MWA 21-cm signal observations
arXiv:2103.07483 · doi:10.1093/mnras/stab776
Abstract
The Murchison Widefield Array (MWA) team has derived new upper limits on the spherically averaged power spectrum of the 21-cm signal at six redshifts in the range . We use these upper limits and a Bayesian inference framework to derive constraints on the ionization and thermal state of the intergalactic medium (IGM) as well as on the strength of a possible additional radio background. We do not find any constraints on the state of the IGM for if no additional radio background is present. In the presence of such a radio background, the 95 per cent credible intervals of the disfavoured models at redshift correspond to an IGM with a volume averaged fraction of ionized regions below 0.6 and an average gas temperature K. In these models, the heated regions are characterised by a temperature larger than that of the radio background, and by a distribution with characteristic size Mpc and a full width at half maximum (FWHM) of Mpc. Within the same credible interval limits, we exclude an additional radio background of at least of the CMB at 1.42 GHz.
arXiv comment13 Pages, 6 Figures, 5 Tables, Accepted for publication in MNRAS
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