Gaia Data Release 1: Pre-processing and source list creation
Gaia Data Release 1: Pre-processing and source list creation
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DOI：
10.1051/0004-6361/201628643
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发表时间：
2016-11
影响因子：
6.5
通讯作者：
C. Fabricius;U. Bastian;J. Portell;J. Castañeda;M. Davidson;N. Hambly;M. Clotet;M. Biermann;A. Mora;D. Busonero;A. Riva;A. Brown;R. Smart;U. Lammers;J. Torra;R. Drimmel;G. Gracia;W. Löffler;A. Spagna;L. Lindegren;S. Klioner;A. Andrei;N. Bach;L. Bramante;T. Brüsemeister;G. Busso;G. Busso;J. Carrasco;M. Gai;N. Garralda;J. J. González-Vidal-J.;R. Guerra;M. Hauser;S. Jordan;C. Jordi;H. Lenhardt;F. Mignard;R. Messineo;A. Mulone;I. Serraller;U. Stampa;P. Tanga;A. V. Elteren;W. V. Reeven;H. Voss;U. Abbas;W. Allasia;M. Altmann;M. Altmann;S. Antón;C. Barache;U. Becciani;J. Berthier;L. Bianchi;A. Bombrun;S. Bouquillon;G. Bourda;B. Bucciarelli;A. Butkevich;R. Buzzi;R. Cancelliere;T. Carlucci;P. Charlot;R. Collins;G. Comoretto;N. Cross;M. Crosta;F. Felice;A. Fienga;F. Figueras;E. Fraile;R. Geyer;J. Hernandez;D. Hobbs;W. Hofmann;S. Liao;E. Licata;M. Martino;P. McMillan;D. Michalik;R. Morbidelli;P. Parsons;M. Pecoraro;M. Ramos-Lerate;M. Sarasso;H. Siddiqui;I. Steele;H. Steidelmüller;F. Taris;A. Vecchiato;A. Abreu;Eduardo Anglada;S. Boudreault;S. Boudreault;M. Cropper;B. Holl;N. Cheek;C. Crowley;J. Fleitas;A. Hutton;J. Osinde;N. Rowell;E. Salguero;E. Utrilla;N. Blagorodnova;N. Blagorodnova;M. Soffel;J. Osorio;D. Vicente;J. Cambras;H. Bernstein
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文献类型：
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作者：
C. Fabricius;U. Bastian;J. Portell;J. Castañeda;M. Davidson;N. Hambly;M. Clotet;M. Biermann;A. Mora;D. Busonero;A. Riva;A. Brown;R. Smart;U. Lammers;J. Torra;R. Drimmel;G. Gracia;W. Löffler;A. Spagna;L. Lindegren;S. Klioner;A. Andrei;N. Bach;L. Bramante;T. Brüsemeister;G. Busso;G. Busso;J. Carrasco;M. Gai;N. Garralda;J. J. González-Vidal-J.;R. Guerra;M. Hauser;S. Jordan;C. Jordi;H. Lenhardt;F. Mignard;R. Messineo;A. Mulone;I. Serraller;U. Stampa;P. Tanga;A. V. Elteren;W. V. Reeven;H. Voss;U. Abbas;W. Allasia;M. Altmann;M. Altmann;S. Antón;C. Barache;U. Becciani;J. Berthier;L. Bianchi;A. Bombrun;S. Bouquillon;G. Bourda;B. Bucciarelli;A. Butkevich;R. Buzzi;R. Cancelliere;T. Carlucci;P. Charlot;R. Collins;G. Comoretto;N. Cross;M. Crosta;F. Felice;A. Fienga;F. Figueras;E. Fraile;R. Geyer;J. Hernandez;D. Hobbs;W. Hofmann;S. Liao;E. Licata;M. Martino;P. McMillan;D. Michalik;R. Morbidelli;P. Parsons;M. Pecoraro;M. Ramos-Lerate;M. Sarasso;H. Siddiqui;I. Steele;H. Steidelmüller;F. Taris;A. Vecchiato;A. Abreu;Eduardo Anglada;S. Boudreault;S. Boudreault;M. Cropper;B. Holl;N. Cheek;C. Crowley;J. Fleitas;A. Hutton;J. Osinde;N. Rowell;E. Salguero;E. Utrilla;N. Blagorodnova;N. Blagorodnova;M. Soffel;J. Osorio;D. Vicente;J. Cambras;H. Bernstein
语境。盖亚任务发布的第一份数据包含超过 10 亿个源的准确位置和星等，以及 250 万颗依帕谷和第谷 2 颗恒星中大多数的自行和视差。目标。我们描述了生成此目录的初始数据处理的三个基本要素：图像分析、源列表的构建以及有效负载健康状况的近实时监控。我们还讨论了一些弱点，这些弱点限制了任务现阶段可达到的精度。方法。点源的图像参数是在线扩散函数时间常数的假设以及偏差和背景的完整建模的情况下，使用最大似然法从一维扫描导出的。然而，这些条件尚未完全满足。盖亚源列表是从大型地面目录开始构建的，但即便如此，仍然添加了大量新条目，并且删除了大量条目。自主星载星图像检测将拾取许多虚假图像，尤其是明亮光源周围的图像，必须识别此类不需要的检测。创建源列表的另一个关键步骤在于将超过 10^(10) 个单独检测排列在可以单独分析的空间隔离组中。结果。已经为盖亚初始数据处理构建了完整的软件系统，每天管理约 5000 万次焦平面传输，为天体测量和光度处理链提供 5 亿张单独 CCD 图像的传输时间和通量。该软件还对 Gaia 健康状况进行成功且详细的日常监控。
Context. The first data release from the Gaia mission contains accurate positions and magnitudes for more than a billion sources, and proper motions and parallaxes for the majority of the 2.5 million HIPPARCOS and Tycho-2 stars. Aims. We describe three essential elements of the initial data treatment leading to this catalogue: the image analysis, the construction of a source list, and the near real-time monitoring of the payload health. We also discuss some weak points that set limitations for the attainable precision at the present stage of the mission. Methods. Image parameters for point sources are derived from one-dimensional scans, using a maximum likelihood method, under the assumption of a line spread function constant in time, and a complete modelling of bias and background. These conditions are, however, not completely fulfilled. The Gaia source list is built starting from a large ground-based catalogue, but even so a significant number of new entries have been added, and a large number have been removed. The autonomous onboard star image detection will pick up many spurious images, especially around bright sources, and such unwanted detections must be identified. Another key step of the source list creation consists in arranging the more than 10^(10) individual detections in spatially isolated groups that can be analysed individually. Results. Complete software systems have been built for the Gaia initial data treatment, that manage approximately 50 million focal plane transits daily, giving transit times and fluxes for 500 million individual CCD images to the astrometric and photometric processing chains. The software also carries out a successful and detailed daily monitoring of Gaia health.