文章基本信息

标题：Gaia Data Release 2
其他标题：Photometric content and validation
本地全文：下载
作者：D. W. Evans ; M. Riello ; F. De Angeli 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2018
卷号：616
DOI：10.1051/0004-6361/201832756
语种：English
出版社：EDP Sciences
摘要：Aims.We describe the photometric content of the second data release of theGaiaproject (GaiaDR2) and its validation along with the quality of the data.Methods.The validation was mainly carried out using an internal analysis of the photometry. External comparisons were also made, but were limited by the precision and systematics that may be present in the external catalogues used.Results.In addition to the photometric quality assessment, we present the best estimates of the three photometric passbands. Various colour-colour transformations are also derived to enable the users to convert between theGaiaand commonly used passbands.Conclusions.The internal analysis of the data shows that the photometric calibrations can reach a precision as low as 2 mmag on individual CCD measurements. Other tests show that systematic effects are present in the data at the 10 mmag level.
关键词：Key wordsencatalogssurveysinstrumentation: photometerstechniques: photometricgalaxies: general