Long troughs in the Lyman-α forest below redshift 6 due to islands of neutral hydrogen

被引：134
|
作者：
Keating, Laura C. [1 ]
Weinberger, Lewis H. [2 ,3 ]
Kulkarni, Girish [4 ]
Haehnelt, Martin G. [2 ,3 ]
Chardin, Jonathan [5 ]
Aubert, Dominique [5 ]
机构：
[1] Univ Toronto, Canadian Inst Theoret Astrophys, 60 St George St, Toronto, ON M5S 3H8, Canada
[2] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England
[3] Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England
[4] Tata Inst Fundamental Res, Dept Theoret Phys, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India
[5] Observ Astron, 11 Rue Univ, F-67000 Strasbourg, France
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 491卷 / 02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;
关键词：
methods: numerical; galaxies: high-redshift; intergalactic medium; quasars: absorption lines; dark ages; reionization; first stars; COSMOLOGICAL RADIATIVE-TRANSFER; SIMULATING COSMIC REIONIZATION; TEMPERATURE-DENSITY RELATION; LY-ALPHA; LUMINOSITY FUNCTION; OPACITY FLUCTUATIONS; EVOLUTION; I; GALAXIES; SPECTRUM;
D O I：
10.1093/mnras/stz3083
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A long (110 cMpc h(-1)) and deep absorption trough in the Ly alpha forest has been observed extending down to redshift 5.5 in the spectrum of ULAS J0148+0600. Although no Ly alpha transmission is detected, Ly beta spikes are present which has led to claims that the gas along this trough must be ionized. Using high-resolution cosmological radiative transfer simulations in large volumes, we show that in a scenario where reionization ends late (z similar to 5.2), our simulations can reproduce troughs as long as observed. In this model, we find that the troughs are caused by islands of neutral hydrogen. Small ionized holes within the neutral islands allow for the transmission of Ly beta. We have also modelled the Ly alpha emitter population around the simulated troughs, and show that there is a deficit of Ly alpha emitters close to the trough as is observed.
引用
收藏
页码：1736 / 1745
页数：10
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