New Damped Lyα Metallicities from Echellette Spectrograph and Imager Spectroscopy of Five Palomar Sky Survey Quasars
New Damped Lyα Metallicities from Echellette Spectrograph and Imager Spectroscopy of Five Palomar Sky Survey Quasars
复制标题
来自五个帕洛马巡天类星体的小阶梯光栅摄谱仪和成像仪光谱的新阻尼 Lyα 金属度
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发表时间：
2003
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影响因子：
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通讯作者：
S. Djorgovski
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作者：
J. Prochaska;S. Castro;S. Djorgovski
本文介绍了Palomar巡天中发现的5个类星体中12个新的z > 3阻尼Lyα系统的化学丰度测量结果。我们确定H I柱密度从配置文件拟合所观察到的阻尼Lyα配置文件和测量离子柱密度和限制所有观察到的金属线过渡。这组数据是用凯克II望远镜上的Echellette摄谱仪和成像仪获得的，它为迅速增长的阻尼Lyα丰度数据库增添了新的内容。它将影响早期宇宙化学演化的研究，并有助于确定使用中阶梯光谱仪进行详细后续观测的候选对象。我们首次发现了具有四个不同阻尼Lyα系统的类星体视线。
This paper presents chemical abundance measurements for 12 new z > 3 damped Lyα systems discovered toward five quasars from the Palomar Sky Survey. We determine H I column densities from profile fits to the observed damped Lyα profiles and measure ionic column densities and limits for all observed metal line transitions. This data set, acquired with the Echellette Spectrograph and Imager on the Keck II telescope, adds to the rapidly growing database of damped Lyα abundances. It will impact studies of chemical evolution in the early universe and help identify candidates for detailed follow-up observations with echelle spectrographs. We report the discovery of the first quasar sight line with four cosmologically distinct damped Lyα systems.