Dark-ages reionization and galaxy formation simulation - XXI. Constraining the evolution of the ionizing escape fraction

被引：0

作者：

Mutch, Simon J. ^{[1
,2
,3
]}

Greig, Bradley ^{[1
,2
]}

Qin, Yuxiang ^{[1
,2
]}

Poole, Gregory B. ^{[1
,4
]}

Wyithe, J. Stuart B. ^{[1
,2
]}

机构：

[1] Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia

[2] ASTRO 3D, ARC Ctr Excellence All Sky Astrophys Dimens 3, Stromlo, Australia

[3] Univ Melbourne, Melbourne Data Analyt Platform, Parkville, Vic 3010, Australia

[4] Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 527卷 / 03期

基金：

澳大利亚研究理事会;

关键词：

galaxies: high-redshift; intergalactic medium; dark ages; reionization; first stars; diffuse radiation; early Universe; cosmology: theory;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The fraction of ionizing photons that escape their host galaxies to ionize hydrogen in the intergalactic medium (IGM) is a critical parameter in analyses of the reionization era. In this paper, we use the MERAXES semi-analytic galaxy formation model to infer the mean ionizing photon escape fraction and its dependence on galaxy properties through joint modelling of the observed high redshift galaxy population and existing constraints on the reionization history. Using a Bayesian framework, and under the assumption that escape fraction is primarily related to halo mass, we find that the joint constraints of the ultraviolet luminosity function, cosmic microwave background optical depth, and the Ly alpha forest require an escape fraction of (18 +/- 5) per cent for galaxies within haloes of M less than or similar to 10(9) M-circle dot and (5 +/- 2) per cent for more massive haloes. In terms of galaxy properties, this transition in escape fraction occurs at stellar masses of M-star similar to 10(7 )M(circle dot), nearly independent of redshift. As a function of redshift, reionization is dominated by the smaller M-star less than or similar to 10(7 )M(circle dot) galaxies with high escape fractions at z greater than or similar to 6 and by the larger M-star greater than or similar to 10(7 )M(circle dot) galaxies with lower escape fractions at z less than or similar to 6. Galaxies with star formation rates of 10(-2.5) M(circle dot)yr(-1) to 10(-1.5 )M(circle dot)yr(-1) provide the dominant source of ionizing photons throughout reionization. Our results are consistent with recent direct measurements of a similar to 5 per cent escape fraction from massive galaxies at the end of reionization and support the picture of low mass galaxies being the dominant sources of ionizing photons during reionization.

引用

页码：7924 / 7939

页数：16

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