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dc.contributor.authorKulkarni, Gen
dc.contributor.authorKeating, LCen
dc.contributor.authorHaehnelt, Martinen
dc.contributor.authorBosman, SEIen
dc.contributor.authorPuchwein, Ewalden
dc.contributor.authorChardin, Jen
dc.contributor.authorAubert, Den
dc.date.accessioned2019-02-22T18:01:38Z
dc.date.available2019-02-22T18:01:38Z
dc.date.issued2019-05-01en
dc.identifier.issn1745-3925
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/289874
dc.description.abstractHigh-redshift QSO spectra show large spatial fluctuations in the Ly$\alpha$ opacity of the intergalactic medium on surprisingly large scales at $z\gtrsim 5.5$. 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 $5<z<6$. The simulation also reproduces the low Thomson scattering optical depth reported by the latest CMB measurement and is consistent with the observed short near-zones and strong red damping wings in the highest-redshift QSOs. It also matches the rapid disappearance of observed Ly$\alpha$ emission by galaxies at $z\gtrsim 6$. 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 $z\sim 6.8$. The late end of reionization results in a large scatter in the photoionisation rate and the neutral hydrogen fraction at redshifts as low as $z\lesssim 5.5$ with large residual neutral `islands' that can produce very long Gunn-Peterson troughs resembling those seen in the data.
dc.titleLarge Ly α opacity fluctuations and low CMB τ in models of late reionization with large islands of neutral hydrogen extending to z &lt; 5.5en
dc.typeArticle
prism.endingPageL28
prism.issueIdentifier1en
prism.publicationDate2019en
prism.publicationNameMonthly Notices of the Royal Astronomical Society: Lettersen
prism.startingPageL24
prism.volume485en
dc.identifier.doi10.17863/CAM.37113
dcterms.dateAccepted2019-02-15en
rioxxterms.versionofrecord10.1093/mnrasl/slz025en
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2019-05-01en
dc.contributor.orcidKulkarni, G [0000-0001-5829-4716]
dc.contributor.orcidKeating, LC [0000-0001-5211-1958]
dc.contributor.orcidHaehnelt, Martin [0000-0001-8443-2393]
dc.contributor.orcidPuchwein, Ewald [0000-0001-8778-7587]
dc.identifier.eissn1745-3933
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEuropean Research Council (320596)
pubs.funder-project-idSCIENCE & TECHNOLOGY FACILITIES COUNCIL (ST/N000927/1)
pubs.funder-project-idSTFC (ST/M007065/1)
pubs.funder-project-idEPSRC (EP/P020259/1)
pubs.funder-project-idSTFC (ST/M007073/1)
pubs.funder-project-idSTFC (ST/R00689X/1)
pubs.funder-project-idSTFC (ST/T001550/1)
pubs.funder-project-idSTFC (ST/S000623/1)
cam.orpheus.successThu Jan 30 10:50:11 GMT 2020 - Embargo updated*
rioxxterms.freetoread.startdate2019-05-31


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