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

被引：212

作者：

Kulkarni, Girish ^{[1
,2
,6
]}

Keating, Laura C. ^{[3
]}

Haehnelt, Martin G. ^{[1
,2
]}

Bosman, Sarah E., I ^{[4
]}

Puchwein, Ewald ^{[1
,2
,7
]}

Chardin, Jonathan ^{[5
]}

Aubert, Dominique ^{[5
]}

机构：

[1] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[2] Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England

[3] Univ Toronto, Canadian Inst Theoret Astrophys, 60 St George St, St George, ON M5S 3H8, Canada

[4] UCL, Dept Phys & Astron, London WC1E 6BT, England

[5] Observ Astronom Strasbourg, 11 Rue Univ, F-67000 Strasbourg, France

[6] Tata Inst Fundamental Res, Dept Theoret Phys, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India

[7] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 485卷 / 01期

基金：

英国工程与自然科学研究理事会; 英国科学技术设施理事会; 欧洲研究理事会;

关键词：

radiative transfer; galaxies: high-redshift; intergalactic medium; quasars: absorption lines; dark ages; reionization; first stars; COSMOLOGICAL RADIATIVE-TRANSFER; FOREST; QUASARS; EPOCH; SIMULATIONS; SPECTRUM; CODE; I;

D O I：

10.1093/mnrasl/slz025

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

High-redshift quasi-stellar object (QSO) spectra show large spatial fluctuations in the Ly alpha opacity of the intergalactic medium on surprisingly large scales at z greater than or similar to 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 cosmic microwave background (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 greater than or similar to 6. Reionization is complete at z = 5.3 in our model, and 50 per cent 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 similar to 6.8. The late end of reionization results in a large scatter in the photoionization rate and the neutral hydrogen fraction at redshifts as low as z less than or similar to 5.5 with large residual neutral 'islands' that can produce very long Gunn-Peterson troughs resembling those seen in the data.

引用

页码：L24 / L28

页数：5

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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 &lt; 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