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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
- 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>~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
- Subjects :
- quasars: absorption lines
radiative transfer
galaxies: high-redshift
Astrophysics::High Energy Astrophysical Phenomena
Astrophysics::Instrumentation and Methods for Astrophysics
dark ages, reionization, first stars
Astrophysics::Cosmology and Extragalactic Astrophysics
intergalactic medium
Astrophysics::Galaxy Astrophysics
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....516eb8738fc0b97c79830c536daf81b9
- Full Text :
- https://doi.org/10.17863/cam.37113