Semi-analytic forecasts for JWST – III. Intrinsic production efficiency of Lyman-continuum radiation
Semi-analytic forecasts for JWST – III. Intrinsic production efficiency of Lyman-continuum radiation
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JWST 的半解析预测 – III 莱曼连续谱辐射的固有生产效率
DOI：
10.1093/mnras/staa714
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发表时间：
2019
影响因子：
4.8
通讯作者：
S. Finkelstein
中科院分区：
文献类型：
--
作者：
L. Y. Aaron Yung;R. Somerville;G. Popping;S. Finkelstein
詹姆斯·韦伯太空望远镜有望在再电离时期，在研究极早期宇宙中的星系群方面取得变革性进展。理解使宇宙再电离的源的一个关键参数是莱曼连续体产生效率，定义为电离光子的产生速率除以固有的UV光度。在这项工作中，我们结合联合收割机自洽星星的形成和化学富集的历史预测的半解析模型的星系形成与恒星的人口合成（SPS）模型，预测预期的依赖于星系的性质和宇宙时代从z = 4-10。然后，我们探讨的敏感性的电离光子，$\dot{N}_\text{ion}$的生产率，SPS模型的选择和我们的星系形成模型中的恒星反馈的处理。我们将我们的结果与其他模拟，经验模型的约束和观察结果进行比较。我们发现，采用SPS模型，包括双星预测约2比模型，只假设单恒星人口的电离辐射的一个因素。我们发现，UV微弱的，低质量的星系有大约0.25 dex比那些更大质量的星系，但发现弱的演化与宇宙时间，约0.2 dex从z 12-4在固定的休息紫外光度。我们提供的$\dot{N}_\text{ion}$作为一个函数的Mh和其他一些星系的属性的预测。这项工作中提出的所有结果都可以在https://www.simonsfoundation.org/semi-analytic-forecasts-for-jwst/上获得。
The James Webb Space Telescope is expected to enable transformational progress in studying galaxy populations in the very early Universe, during the epoch of reionization. A critical parameter for understanding the sources that reionized the Universe is the Lyman-continuum production efficiency, ξion, defined as the rate of production of ionizing photons divided by the intrinsic UV luminosity. In this work, we combine self-consistent star formation and chemical enrichment histories predicted by semi-analytic models of galaxy formation with stellar population synthesis (SPS) models to predict the expected dependence of ξion on galaxy properties and cosmic epoch from z = 4–10. We then explore the sensitivity of the production rate of ionizing photons, $\dot{N}_\text{ion}$, to the choice of SPS model and the treatment of stellar feedback in our galaxy formation model. We compare our results to those of other simulations, constraints from empirical models, and observations. We find that adopting SPS models that include binary stars predict about a factor of 2 more ionizing radiation than models that only assume single stellar populations. We find that UV-faint, low-mass galaxies have values of ξion about 0.25 dex higher than those of more massive galaxies, but find weak evolution with cosmic time, about 0.2 dex from z ∼ 12–4 at fixed rest-UV luminosity. We provide predictions of $\dot{N}_\text{ion}$ as a function of Mh and a number of other galaxy properties. All results presented in this work are available at https://www.simonsfoundation.org/semi-analytic-forecasts-for-jwst/.
BlueTides 模拟中第一个星系的属性
影响因子：
4.8
作者：
Wilkins S
通讯作者：
Wilkins S