The thesan project: properties of the intergalactic medium and its connection to reionization-era galaxies

被引：81

作者：

Garaldi, E. ^{[1
]}

Kannan, R. ^{[2
]}

Smith, A. ^{[3
]}

Springel, V ^{[1
]}

Pakmor, R. ^{[1
]}

Vogelsberger, M. ^{[3
]}

Hernquist, L. ^{[2
]}

机构：

[1] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85741 Garching, Germany

[2] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[3] MIT, Dept Phys, Cambridge, MA 02139 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 512卷 / 04期

关键词：

radiative transfer; methods: numerical; galaxies: high-redshift; dark ages; reionization; first stars; LY-ALPHA EMISSION; MEAN FREE-PATH; SIMILAR-TO; 6; RADIATION-HYDRODYNAMICS SIMULATION; TEMPERATURE-DENSITY RELATION; UV LUMINOSITY FUNCTION; ILLUSTRISTNG SIMULATIONS; HYDROGEN REIONIZATION; COSMIC REIONIZATION; IONIZING PHOTONS;

D O I：

10.1093/mnras/stac257

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The high-redshift intergalactic medium (IGM) and the primeval galaxy population are rapidly becoming the new frontier of extragalactic astronomy. We investigate the IGM properties and their connection to galaxies at z >= 5.5 under different assumptions for the ionizing photon escape and the nature of dark matter, employing our novel thesan radiation-hydrodynamical simulation suite, designed to provide a comprehensive picture of the emergence of galaxies in a full reionization context. Our simulations have realistic 'late' reionization histories, match available constraints on global IGM properties, and reproduce the recently observed rapid evolution of the mean free path of ionizing photons. We additionally examine high-z Lyman-alpha transmission. The optical depth evolution is consistent with data, and its distribution suggests an even-later reionization than simulated, although with a strong sensitivity to the source model. We show that the effects of these two unknowns can be disentangled by characterizing the spectral shape and separation of Lyman-alpha transmission regions, opening up the possibility to observationally constrain both. For the first time in simulations, thesan reproduces the modulation of the Lyman-alpha flux as a function of galaxy distance, demonstrating the power of coupling a realistic galaxy formation model with proper radiation hydrodynamics. We find this feature to be extremely sensitive on the timing of reionization, while being relatively insensitive to the source model. Overall, thesan produces a realistic IGM and galaxy population, providing a robust framework for future analysis of the high-z Universe.

引用

页码：4909 / 4933

页数：25

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