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arXiv 1810.09754astro-ph.GAastro-ph.CO
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FirstLight III:宇宙黎明时模拟星系的静止标架紫外光谱能量分布

FirstLight III: Rest-frame UV-optical spectral energy distributions of simulated galaxies at cosmic dawn

Daniel Ceverino, Ralf Klessen, Simon Glover

摘要:

使用FirstLight数据库的300放大宇宙学模拟,我们提供了休息帧的紫外光谱能量分布的星系与复杂的恒星形成的历史,耦合到非均匀的气体吸积历史的星系晕在宇宙黎明。在任何红移下,星系群都是非常多样的,从恒星暴到静止星系,甚至是固定恒星质量的星系。这驱动着紫外线光度和恒星质量之间的红移依赖关系,具有较大的散射,由特定的恒星形成率驱动。紫外线斜率和莱曼连续光子的生产效率有很高的值,与灰尘校正的观测结果一致。这表明年轻的恒星星族具有低金属丰度。FirstLight模拟对z=6-12的星系的静止帧UV光学绝对星等,颜色和光学发射线进行了预测,这些星系将在未来十年内首次使用JWST和下一代望远镜进行观测。

英文摘要:

Using the FirstLight database of 300 zoom-in cosmological simulations we provide rest-frame UV-optical spectral energy distributions of galaxies with complex star-formation histories that are coupled to the non-uniform gas accretion history of galactic halos during cosmic dawn. The population at any redshift is very diverse ranging from starbursts to quiescent galaxies even at a fixed stellar mass. This drives a redshift-dependent relation between UV luminosity and stellar mass with a large scatter, driven by the specific star formation rate. The UV slope and the production efficiency of Lyman continuum photons have high values, consistent with dust-corrected observations. This indicates young stellar populations with low metallicities. The FirstLight simulations make predictions on the rest-frame UV-optical absolute magnitudes, colors and optical emission lines of galaxies at z=6-12 that will be observed for the first time with JWST and the next generation of telescopes in the coming decade.

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