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  Constraining the state of the intergalactic medium during the Epoch of Reionization using MWA 21-cm signal observations

Ghara, R., Giri, S. K., Ciardi, B., Mellema, G., & Zaroubi, S. (2021). Constraining the state of the intergalactic medium during the Epoch of Reionization using MWA 21-cm signal observations. Monthly Notices of the Royal Astronomical Society, 503(3), 4551-4562. doi:10.1093/mnras/stab776.

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Ghara, Raghunath, Author
Giri, Sambit K., Author
Ciardi, Benedetta1, Author           
Mellema, Garrelt, Author
Zaroubi, Saleem, Author
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1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 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 z ≈ 6.5–8.7. 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 z ≳ 7.8 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 ≳ 6.5 correspond to an IGM with a volume-averaged fraction of ionized regions below 0.6 and an average gas temperature ≲ 103 K. In these models, the heated regions are characterized by a temperature larger than that of the radio background, and by a distribution with characteristic size ≲10h−1 Mpc and a full width at half maximum (FWHM) of ≲30h−1 Mpc. Within the same credible interval limits, we exclude an additional radio background of at least 0.008 per cent of the CMB at 1.42 GHz.

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 Dates: 2021-03-17
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stab776
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 503 (3) Sequence Number: - Start / End Page: 4551 - 4562 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150