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Title: Gaia Data Release 2 - Photometric content and validation
Author: Gaia Collaboration
Riello, Marco
Angeli, Francesca de
Carrasco Martínez, José Manuel
Montegriffo, Paolo
Fabricius, Claus
Jordi i Nebot, Carme
Portell i de Mora, Jordi
Balaguer Núñez, María de los Dolores
Busso, Giorgia
Cacciari, Carla
Leeuwen, Floor van
Burgess, Patrick W.
Davidson, Michael
Evans, Dafydd Wyn
Keywords: Astrometria
Catàlegs d'estels
Instruments astronòmics
Star catalogs
Astronomical instruments
Issue Date: 10-Aug-2018
Publisher: EDP Sciences
Abstract: Aims. We describe the photometric content of the second data release of the Gaia project (Gaia DR2) 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 the Gaia and 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.
Note: Reproducció del document publicat a:
It is part of: Astronomy & Astrophysics, 2018, vol. 616, num. A4
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ISSN: 0004-6361
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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