Distant Galaxies If the line of sight from Earth to a distant quasar passes through foreground material, some of the quasar's light is absorbed. If a galaxy-sized quantity of gas intervenes, it forms a damped Lyman-α system (DLA), visible as absorption lines in the quasar spectrum. Using the Atacama Large Millimeter/Submillimeter Array, Neeleman et al. observed two quasars with known DLAs. They detected emission from gas and dust in two foreground galaxies associated with the DLAs and were able to measure their star-formation rates. Combining these different tracers of DLAs will help us understand how galaxies evolved in the early universe. Science , this issue p. [1285][1] [1]: /lookup/doi/10.1126/science.aal1737

中文翻译：

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识别类星体吸收体的宿主

遥远的星系 如果从地球到遥远类星体的视线穿过前景物质，类星体的一些光就会被吸收。如果有星系大小的气体介入，就会形成阻尼莱曼-α系统（DLA），在类星体光谱中以吸收线的形式可见。使用 Atacama 大型毫米/亚毫米阵列，Neeleman 等人。观察到两个具有已知 DLA 的类星体。他们在与 DLA 相关的两个前景星系中检测到气体和尘埃的排放，并能够测量它们的恒星形成率。结合这些不同的 DLA 示踪剂将帮助我们了解星系在早期宇宙中是如何演化的。科学，这个问题 p。[1285][1][1]：/lookup/doi/10.1126/science.aal1737