Gaia 早期数据发布 3：内容概要及巡天特性
星系天体物理
2021-12-26 v2
摘要
我们呈现了第三次 Gaia 数据发布的早期版本 Gaia EDR3，包含亮度高于 21 等的 18 亿个源的天体测量与测光数据，并辅以来自 Gaia DR2 的视向速度列表。Gaia EDR3 包含约 18 亿个源的天球位置与 G 波段视亮度。其中 15 亿个源还提供了视差、自行以及 (G_BP-G_RP) 颜色。G、G_BP 和 G_RP 的波段响应函数作为发布内容的一部分提供。为便于使用，在剔除少量伪值后，Gaia DR2 的 700 万条视向速度被纳入本次发布。新的视向速度将作为 Gaia DR3 的一部分出现。最后，Gaia EDR3 代表了光学波段天球参考架（CRF）的更新实现，即 Gaia-CRF3，其仅基于河外源。Gaia EDR3 源表的构建包含了若干增强，使其对高自行恒星以及伪源与部分分辨源的干扰效应更具鲁棒性。源表大体与 Gaia DR2 相同，但确实包含了新源并有一些显著变化。该源表在 Gaia DR3 中将不再改变。Gaia EDR3 相较 Gaia DR2 有显著进步：视差精度提升 30%，自行精度提升 2 倍，且天体测量中的系统误差对于视差被压低 30–40%，对于自行被压低约 2.5 倍。测光精度亦有所提升，但最重要的是在颜色、星等与天球位置之间具有好得多的均匀性。单一的 G、G_BP 和 G_RP 波段响应函数在整个星等与颜色范围内有效，在 1% 水平以上无系统误差。
引用
@article{arxiv.2012.01533,
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journal= {arXiv preprint arXiv:2012.01533},
year = {2021}
}
备注
Accepted for A&A Special Issue on Gaia EDR3, 21 pages, 2 figures. This version includes the updates in the erratum (https://doi.org/10.1051/0004-6361/202039657e)