论文标题
Astraeus III：电源源的环境和物理特性
Astraeus III: The environment and physical properties of reionization sources
论文作者
论文摘要
在这项工作中，我们使用{\ sc astraeus}（在N体暗物质模拟中，星系形成和电离的辐射转移耦合）框架在前十亿年内将星系的形成和电源结合在一起。探索许多用于电离反馈的模型以及从银河环境中电离辐射的逃生部分（$ f_ \ mathrm {Esc} $），我们量化了恒星形成星系的贡献{（使用Halo MassES $ M_H> 10^{8.2}} {8.2} $ $ _ \ odot $） $ f_ \ mathrm {Esc} $和环境过度密度。我们的主要发现是：（i）对于常数$ f_ \ mathrm {Esc} $型号，中间质量星系（带有$ m_h \ simeq10^{9-11} $ m $ $ _ \ odot $和绝对UV的UV大小的$ m_h \ simeq10^{9-11} $ m_ {uv}; （ii）$ f_ \ mathrm {esc} $随着光晕质量的减少而增加的场景增加了星系群体的驱动回离为低质量星系（$ m_h \ lyseSim10^{9.5} $ m $ _ $ _ \ odot $），具有较低的发光液（$ m_ {$ m_ {uv} uv} \ g gersim-16 $ -16 $ 16 （iii）通过辐射反馈，将其在低质量星系的电离发射率（$ m_h \ syssim10^{9} {9} $ m $ _ \ odot $）的电离发射率上印记。低质量星系通过辐射反馈会更强烈地抑制恒星形成，并在过度密集的区域显示出较低的电离发射率。 （iv）带有星系属性的$ f_ \ mathrm {Esc} $的变化对辐射反馈的强度和环境过度密度扮演了次优势的作用； （v）JWST-SURVEYS（限制$ m_ {uv} = -16 $）将能够检测出提供$ \ sim 60-70 \％$（$ \ sim 10 \％$）的星系，以$ f _ \ f_ mathrm {eSceAim $ f in $ z = 7 $的$ z $ z $ f _ $ f。随着光环质量的减少）。
In this work, we use the {\sc astraeus} (seminumerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body dArk mattEr simUlationS) framework which couples galaxy formation and reionization in the first billion years. Exploring a number of models for reionization feedback and the escape fraction of ionizing radiation from the galactic environment ($f_\mathrm{esc}$), we quantify how the contribution of star-forming galaxies {(with halo masses $M_h>10^{8.2}$M$_\odot$)} to reionization depends on the radiative feedback model, $f_\mathrm{esc}$, and the environmental over-density. Our key findings are: (i) for constant $f_\mathrm{esc}$ models, intermediate-mass galaxies (with halo masses of $M_h\simeq10^{9-11}$M$_\odot$ and absolute UV magnitudes of $M_{UV} \sim -15$ to $-20$) in intermediate-density regions drive reionization; (ii) scenarios where $f_\mathrm{esc}$ increases with decreasing halo mass shift the galaxy population driving reionization to lower-mass galaxies ($M_h\lesssim10^{9.5}$M$_\odot$) with lower luminosities ($M_{UV} \gtrsim-16$) and over-densities; (iii) reionization imprints its topology on the ionizing emissivity of low-mass galaxies ($M_h\lesssim10^{9}$M$_\odot$) through radiative feedback. Low-mass galaxies experience a stronger suppression of star formation by radiative feedback and show lower ionizing emissivities in over-dense regions; (iv) a change in $f_\mathrm{esc}$ with galaxy properties has the largest impact on the sources of reionization and their detectability, with the radiative feedback strength and environmental over-density playing a sub-dominant role; (v) JWST-surveys (with a limiting magnitude of $M_{UV} = -16$) will be able to detect the galaxies providing $\sim 60-70\%$ ($\sim 10\%$) of reionization photons at $z=7$ for constant $f_\mathrm{esc}$ models (scenarios where $f_\mathrm{esc}$ increases with decreasing halo mass).
