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Title: Gaia Data Release 2: Catalogue validation
Author: Gaia Collaboration
Luri Carrascoso, Xavier
Cantat Gaudin, Tristan
Fabricius, Claus
Jordi i Nebot, Carme
Soria Nieto, Sergio
Romero Gómez, Mercè
Antoja Castelltort, M. Teresa
Keywords: Astrometria
Catàlegs d'estels
Star catalogs
Issue Date: 20-Aug-2018
Publisher: EDP Sciences
Abstract: The second Gaia data release (DR2), contains very precise astrometric and photometric properties for more than one billion sources, astrophysical parameters for dozens of millions, radial velocities for millions, variability information for half a million of stellar sources and orbits for thousands of solar system objects. Before the Catalogue publication, these data have undergone dedicated validation processes. The goal of this paper is to describe the validation results in terms of completeness, accuracy and precision of the various Gaia DR2 data. The validation processes include a systematic analysis of the Catalogue content to detect anomalies, either individual errors or statistical properties, using statistical analysis, and comparisons to external data or to models. Although the astrometric, photometric and spectroscopic data are of unprecedented quality and quantity, it is shown that the data cannot be used without a dedicated attention to the limitations described here, in the Catalogue documentation and in accompanying papers. A particular emphasis is put on the caveats for the statistical use of the data in scientific exploitation.
Note: Reproducció del document publicat a:
It is part of: Astronomy & Astrophysics, 2018, vol. 616, num. A17
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ISSN: 0004-6361
Appears in Collections:Publicacions de projectes de recerca finançats per la UE
Articles publicats en revistes (Física Quàntica i Astrofísica)

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