We summarise recent results assessing the carbon and silicon abundances of the intergalactic medium (IGM) using the 'pixel optical depth' technique. We briefly discuss the implications of these results for models of intergalactic enrichment, focusing on distinguishing 'early' z>4 enrichment by the first generations of stars and objects from 'late' enrichment by 2 Ss z < 5 Ly-break galaxies We then discuss the comparison of observed QSO spectra to simulated spectra generated from cosmologicai simulations that self-consistently include enrichment, and draw qualitative implications for the general picture of intergalactic enrichment at z > 2.
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机译：我们总结了最近的结果，使用“像素光学深度”技术评估了间介质（IGM）的碳和硅丰度。我们简要讨论了这些结果对白术富集的模型的影响，专注于将“早期的Z> 4浓缩，从”迟到“富集的第一批恒星和物体由2 SS Z <5 Ly-Break Galaxies进行讨论观察到的QSO光谱与从宇宙型模拟产生的模拟光谱的比较，自始终包括富集，并对Z> 2的间歇性富集的总体图像提取定性影响。
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