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Large Ly α opacity fluctuations and low CMB τ in models of late reionization with large islands of neutral hydrogen extending to z < 5.5

Large Ly α opacity fluctuations and low CMB τ in models of late reionization with large islands of neutral hydrogen extending to z < 5.5

Authors :
Kulkarni, G
Keating, LC
Haehnelt, MG
Bosman, SEI
Puchwein, E
Chardin, J
Aubert, D
Kulkarni, G [0000-0001-5829-4716]
Keating, LC [0000-0001-5211-1958]
Puchwein, E [0000-0001-8778-7587]
Apollo - University of Cambridge Repository
Publication Year :
2019
Publisher :
Apollo - University of Cambridge Repository, 2019.

Abstract

High-redshift QSO spectra show large spatial fluctuations in the Ly-alpha opacity of the intergalactic medium on surprisingly large scales at z&gt;~5.5. We present a radiative transfer simulation of cosmic reionization driven by galaxies that reproduces this large scatter and the rapid evolution of the Ly-alpha opacity distribution at 5~6. Reionization is complete at z=5.3 in our model, and 50% of the volume of the Universe is ionized at z=7. Agreement with the Ly-alpha forest data in such a late reionization model requires a rapid evolution of the ionizing emissivity of galaxies that peaks at z~6.8. The late end of reionization results in a large scatter in the photoionisation rate and the neutral hydrogen fraction at redshifts as low as z

Details

Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....516eb8738fc0b97c79830c536daf81b9
Full Text :
https://doi.org/10.17863/cam.37113