We present and make publicly available the third data release (DR3) of the Keck Observatory Database of Ionized Absorption toward Quasars (KODIAQ) survey. KODIAQ DR3 consists of a fully-reduced sample of 727 quasars at 0.1 < zem < 6.4 observed with ESI at moderate resolution (4000 ≤ R ≤ 10000). DR3 contains 872 spectra available in flux calibrated form, representing a sum total exposure time of ∼ 2.8 megaseconds. These co-added spectra arise from a total of 2753 individual exposures of quasars taken from the Keck Observatory Archive (KOA) in raw form and uniformly processed using a data reduction package made available through the XIDL distribution. DR3 is publicly available to the community, housed as a higher level science product at the KOA and in the igmspec database.

中文翻译：

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KODIAQ调查第三次数据发布

我们展示并公开发布了凯克天文台对类星体电离吸收数据库 (KODIAQ) 调查的第三次数据发布 (DR3)。KODIAQ DR3 由 727 个类星体的完全缩减样本组成，这些类星体在 0.1 < zem < 6.4 时使用 ESI 以中等分辨率（4000 ≤ R ≤ 10000）观察到。DR3 包含 872 个可用通量校准形式的光谱，表示总曝光时间约为 2.8 兆秒。这些共同添加的光谱来自凯克天文台档案 (KOA) 以原始形式拍摄的总共 2753 次单独曝光的类星体，并使用通过 XIDL 分发提供的数据简化包进行统一处理。DR3 向社区公开，作为更高级别的科学产品存放在 KOA 和 igmspec 数据库中。