High-redshift predictions from IllustrisTNG – III. Infrared luminosity functions, obscured star formation, and dust temperature of high-redshift galaxies
High-redshift predictions from IllustrisTNG – III. Infrared luminosity functions, obscured star formation, and dust temperature of high-redshift galaxies
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IllustrisTNG 的高红移预测 – III。
DOI：
10.1093/mnras/stab3794
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发表时间：
2022
影响因子：
4.8
通讯作者：
Torrey, Paul
中科院分区：
文献类型：
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作者：
Shen, Xuejian;Vogelsberger, Mark;Nelson, Dylan;Tacchella, Sandro;Hernquist, Lars;Springel, Volker;Marinacci, Federico;Torrey, Paul
我们用传统的传输计算对插图中的星系进行后处理，以预测≥4下星系的近红外和远红外性质。从TNG得到的剩余架K波段和Z波段星系光度函数与观测基本一致，尽管对MK≲−25和Mz≲−24的z=4预测偏低。给出了JWSTMIRI观测到的星系光度函数和数目的预测。根据理论估计，JWST进行的下一代观测可以在atz=6(z=8)的调查区域内探测到F1000W中的500(30)个星系。与紫外线、光学和近红外的一致性相反，我们发现TNG与我们的尘埃模型选择相结合，大大低估了大多数尘埃遮挡的、因此最明亮的FIR星系的丰度。其结果是，被遮挡的宇宙恒星形成率密度(SFRD)和由光学/近红外暗天体贡献的SFRD被低估。这里发现的差异可能会对次网格反馈模型或模拟的尘埃含量提供新的约束。同时，尽管TNG预报的尘埃温度及其与红外光度和红移的关系与观测结果定性一致，但Z≥6星系的尘埃峰值温度被高估了约30%。这可能与我们的模拟有限的质量分辨率有关，在这些红移时，我们无法完全解析星际介质的孔隙度(或者特别是它的尘埃含量)。
We post-process galaxies in the IllustrisTNG simulations withskirtradiative transfer calculations to make predictions for the rest-frame near-infrared (NIR) and far-infrared (FIR) properties of galaxies atz≥ 4. The rest-frameK- andz-band galaxy luminosity functions from TNG are overall consistent with observations, despiteunderprediction atz= 4 forMK≲ −25 andMz≲ −24. Predictions for theJWSTMIRI observed galaxy luminosity functions and number counts are given. Based on theoretical estimations, we show that the next-generation survey conducted byJWSTcan detect 500 (30) galaxies in F1000W in a survey area ofatz= 6 (z= 8). As opposed to the consistency in the UV, optical, and NIR, we find that TNG, combined with our dust modelling choices, significantly underpredicts the abundance of most dust-obscured and thus most luminous FIR galaxies. As a result, the obscured cosmic star formation rate density (SFRD) and the SFRD contributed by optical/NIR dark objects are underpredicted. The discrepancies discovered here could provide new constraints on the sub-grid feedback models, or the dust contents, of simulations. Meanwhile, although the TNG predicted dust temperature and its relations with IR luminosity and redshift are qualitatively consistent with observations, the peak dust temperature ofz≥ 6 galaxies are overestimated by about. This could be related to the limited mass resolution of our simulations to fully resolve the porosity of the interstellar medium (or specifically its dust content) at these redshifts.