Gaia早期数据发布3：天体测量解
天体物理仪器与方法
2021-04-28 v1
摘要
Gaia早期数据发布3（Gaia EDR3）包含基于欧洲空间局Gaia卫星在运行阶段前34个月收集观测所得的18.12亿个源的结果，星等范围G = 3至21。我们描述了用于Gaia EDR3天体测量内容的输入数据、模型和处理，以及天体测量任务内对这些结果的验证。处理大体遵循与Gaia DR2相同的流程，但在观测建模上有显著改进。在Gaia数据处理中，首次对来自DR2具有良好确定颜色的源使用了线扩散函数和点扩散函数的颜色相关校准。在天体测量处理中，这些源获得了五参数解，而其他源使用一种特殊校准处理，该校准允许将伪颜色估计为第六个天体测量参数。与DR2相比，天体测量校准模型已扩展，且自旋相关畸变模型包含基本角变化的一致确定，改善了全球视差零点。Gaia EDR3为14.68亿个源提供完整天体测量数据（历元J2016.0的位置、视差和自行），以及5.85亿个五参数解、8.82亿个六参数解，并为额外3.44亿个源提供J2016.0的平均位置。五参数解通常比六参数解更精确，且可用于G = 17 mag以亮93%的源。视差和年自行的中位不确定度在G = 9至14星等为0.02–0.03 mas，在G = 20约为0.5 mas。提供了对解统计特性的广泛表征，包括从类星体估计的视差偏差角功率谱。
引用
@article{arxiv.2012.03380,
title = {Gaia Early Data Release 3: The astrometric solution},
author = {L. Lindegren and S. A. Klioner and J. Hernández and A. Bombrun and M. Ramos-Lerate and H. Steidelmüller and U. Bastian and M. Biermann and A. de Torres and E. Gerlach and R. Geyer and T. Hilger and D. Hobbs and U. Lammers and P. J. McMillan and C. A. Stephenson and J. Castañeda and M. Davidson and C. Fabricius and G. Gracia-Abril and J. Portell and N. Rowell and D. Teyssier and F. Torra and S. Bartolomé and M. Clotet and N. Garralda and J. J. González-Vidal and J. Torra and U. Abbas and M. Altmann and E. Anglada Varela and L. Balaguer-Núñez and Z. Balog and C. Barache and U. Becciani and M. Bernet and S. Bertone and L. Bianchi and S. Bouquillon and A. G. A. Brown and B. Bucciarelli and D. Busonero and A. G. Butkevich and R. Buzzi and R. Cancelliere and T. Carlucci and P. Charlot and M. -R. L. Cioni and M. Crosta and C. Crowley and E. F. del Peloso and E. del Pozo and R. Drimmel and P. Esquej and A. Fienga and E. Fraile and M. Gai and M. Garcia-Reinaldos and R. Guerra and N. C. Hambly and M. Hauser and K. Janßen and S. Jordan and Z. Kostrzewa-Rutkowska and M. G. Lattanzi and S. Liao and E. Licata and T. A. Lister and W. Löffler and J. M. Marchant and A. Masip and F. Mignard and A. Mints and D. Molina and A. Mora and R. Morbidelli and C. P. Murphy and C. Pagani and P. Panuzzo and X. Peñalosa Esteller and E. Poggio and P. Re Fiorentin and A. Riva and A. Sagristà Sellés and V. Sanchez Gimenez and M. Sarasso and E. Sciacca and H. I. Siddiqui and R. L. Smart and D. Souami and A. Spagna and I. A. Steele and F. Taris and E. Utrilla and W. van Reeven and A. Vecchiato},
journal= {arXiv preprint arXiv:2012.03380},
year = {2021}
}
备注
35 pages, 26 figures. Accepted for publication in Astronomy & Astrophysics