Crucial Factors for Lyα Transmission in the Reionizing Intergalactic Medium: Infall Motion, H ii Bubble Size, and Self-shielded Systems

被引：30

作者：

Park, Hyunbae ^{[1
,2
]}

Jung, Intae ^{[3
,4
,5
]}

Song, Hyunmi ^{[6
]}

Ocvirk, Pierre ^{[7
]}

Shapiro, Paul R. ^{[8
]}

Dawoodbhoy, Taha ^{[8
]}

Iliev, Ilian T. ^{[9
]}

Ahn, Kyungjin ^{[10
]}

Bianco, Michele ^{[9
]}

Kim, Hyo Jeong ^{[10
]}

机构：

[1] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[2] Univ Tokyo, UTIAS, Kavli IPMU WPI, Kashiwa, Chiba 2778583, Japan

[3] Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA

[4] Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA

[5] NASA GSFC, Ctr Res & Explorat Space Sci & Technol, Greenbelt, MD 20771 USA

[6] Chungnam Natl Univ, Dept Astron & Space Sci, Daejeon 34134, South Korea

[7] Univ Strasbourg, Observ Astron Strasbourg, CNRS, UMR 7550, F-67000 Strasbourg, France

[8] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[9] Univ Sussex, Astron Ctr, Dept Phys & Astron, Pevensey 3 Bldg, Brighton BN1 9QH, E Sussex, England

[10] Chosun Univ, Dept Earth Sci, Gwangju 61452, South Korea

来源：

ASTROPHYSICAL JOURNAL | 2021年 / 922卷 / 02期

基金：

英国科学技术设施理事会; 新加坡国家研究基金会; 美国国家科学基金会;

关键词：

RADIATION-HYDRODYNAMICS SIMULATION; LYMAN-ALPHA; LUMINOSITY FUNCTION; GALAXY FORMATION; TO; 6-7; ACCELERATED REIONIZATION; COSMIC REIONIZATION; EMITTING GALAXIES; EMITTERS; REDSHIFT;

D O I：

10.3847/1538-4357/ac2f4b

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using the CoDa II simulation, we study the Ly alpha transmissivity of the intergalactic medium (IGM) during reionization. At z > 6, a typical galaxy without an active galactic nucleus fails to form a proximity zone around itself due to the overdensity of the surrounding IGM. The gravitational infall motion in the IGM makes the resonance absorption extend to the red side of Ly alpha, suppressing the transmission up to roughly the circular velocity of the galaxy. In some sight lines, an optically thin blob generated by a supernova in a neighboring galaxy results in a peak feature, which can be mistaken for a blue peak. Redward of the resonance absorption, the damping-wing opacity correlates with the global IGM neutral fraction and the UV magnitude of the source galaxy. Brighter galaxies tend to suffer lower opacity because they tend to reside in larger H ii regions, and the surrounding IGM transmits redder photons, which are less susceptible to attenuation, owing to stronger infall velocity. The H ii regions are highly nonspherical, causing both sight-line-to-sight-line and galaxy-to-galaxy variation in opacity. Also, self-shielded systems within H ii regions strongly attenuate the emission for certain sight lines. All these factors add to the transmissivity variation, requiring a large sample size to constrain the average transmission. The variation is largest for fainter galaxies at higher redshift. The 68% range of the transmissivity is similar to or greater than the median for galaxies with M (UV) >= -21 at z >= 7, implying that more than a hundred galaxies would be needed to measure the transmission to 10% accuracy.

引用

页数：18

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