Large Lyman-alpha opacity fluctuations and low CMB tau in models of late reionization with large islands of neutral hydrogen extending to z<5.5

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<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>~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<~5.5 with large residual neutral 'islands' that can produce very long Gunn-Peterson troughs resembling those seen in the data.

5 pages, 3 figures; accepted for publication in MNRAS

References in corpus (48)

• Planck 2013 results. XVI. Cosmological parameters
• The cosmological simulation code GADGET-2
• Cosmic Star Formation History
• GADGET: A code for collisionless and gasdynamical cosmological simulations
• Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ~ 6 Quasars II: A Sample of 19 Quasars
• Radiative transfer in a clumpy universe: IV. New synthesis models of the cosmic UV/X-ray background
• Model-independent evidence in favor of an end to reionization by z~6
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• The Dearth of z~10 Galaxies in all HST Legacy Fields -- The Rapid Evolution of the Galaxy Population in the First 500 Myr
• Escape fraction of ionizing photons during reionization: effects due to supernova feedback and runaway OB stars
• Detection of Extended He II Reionization in the Temperature Evolution of the Intergalactic Medium
• The Most Luminous z~9-10 Galaxy Candidates yet Found: The Luminosity Function, Cosmic Star-Formation Rate, and the First Mass Density Estimate at 500 Myr
• Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7
• Inferring the dark matter power spectrum from the Lyman-alpha forest in high-resolution QSO absorption spectra
• The SPHINX Cosmological Simulations of the First Billion Years: the Impact of Binary Stars on Reionization
• Multi--dimensional Cosmological Radiative Transfer with a Variable Eddington Tensor Formalism
• Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey
• Keeping the Universe ionised: Photo-heating and the clumping factor of the high-redshift intergalactic medium
• Evolution of the AGN UV luminosity function from redshift 7.5
• Fluctuating feedback-regulated escape fraction of ionizing radiation in low-mass, high-redshift galaxies
• The First Billion Years Project: The escape fraction of ionizing photons in the epoch of reionization
• Escape fraction of ionizing photons from high-redshift galaxies in cosmological SPH simulations
• The Giant Gemini GMOS survey of z>4.4 quasars - I. Measuring the mean free path across cosmic time
• New constraints on Lyman-α opacity with a sample of 62 quasars at z > 5.7
• Feedback-regulated star formation and escape of LyC photons from mini-haloes during reionisation
• Consistent modelling of the meta-galactic UV background and the thermal/ionization history of the intergalactic medium
• The Sherwood simulation suite: overview and data comparisons with the Lyman-alpha forest at redshifts 2 < z < 5
• Are we witnessing the epoch of reionisation at $z=7.1$ from the spectrum of J1120+0641?
• A radiative transfer scheme for cosmological reionization based on a local Eddington tensor
• The Opacity of the Intergalactic Medium Measured Along Quasar Sightlines at $z\sim 6$
• Large fluctuations in the hydrogen-ionizing background and mean free path following the epoch of reionization
• Lyman-alpha emitters gone missing: evidence for late reionization?
• Was reionization complete by z ~ 5-6?
• Lyα emission line reconstruction for high-$z$ QSOs
• Quasar Proximity Zones and Patchy Reionization
• Reionization simulations powered by GPUs I: the structure of the Ultraviolet radiation field
• Large scale opacity fluctuations in the Lyman alpha forest: evidence for QSOs dominating the ionising UV background at z ~ 5.5-6 ?
• Self-Consistent Modeling of Reionization in Cosmological Hydrodynamical Simulations
• Large Opacity Variations in the High-Redshift Lyman-alpha Forest: the Signature of Relic Temperature Fluctuations from Patchy Reionization
• Characterizing the Pressure Smoothing Scale of the Intergalactic Medium
• Evidence for Large-Scale Fluctuations in the Metagalactic Ionizing Background Near Redshift Six
• On the Contribution of Active Galactic Nuclei to the High-Redshift Metagalactic Ionizing Background
• Have We Detected Patchy Reionization in Quasar Spectra?
• Spatial fluctuations of the intergalactic temperature-density relation after hydrogen reionization
• Observations of the Lyman series forest towards the redshift 7.1 quasar ULAS J1120+0641
• Determining the Nature of Late Gunn-Peterson Troughs with Galaxy Surveys
• Self-shielding of hydrogen in the IGM during the epoch of reionization
• A Quasar Discovered at redshift 6.6 from Pan-STARRS1

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