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Title: Gaia Data Release 1: Summary of the astrometric, photometric and survey properties
Author: Mor Crespo, Roger
Romero Gómez, Mercè
González Vidal, Juan José
Portell i de Mora, Jordi
Jordi i Nebot, Carme
Luri Carrascoso, Xavier
Masana Fresno, Eduard
Torra Roca, Jorge
Balaguer Núñez, María de los Dolores
Fabricius, Claus
Figueras Siñol, Francesca
Fries, Aidan
Castañeda Pons, Javier Bernardo
Carrasco Martínez, José Manuel
Gràcia Abril, G.
Antiche Garzón, Erika
Borrachero, Raúl
Clotet Altarriba, Marcial
Farras Casas, Martí
Garralda Torre, Nora
Gúrpide Lasheras, Andrés
Soria Nieto, Sergio
Voss, Hölger
Weiler, Michael
Anglada Escudé, Guillem
Gallardo, E.
Isasi Parache, Y.
Julbe, Francesc
Molina Martínez, Daniel
Gebran, M.
Martínez Rubí, O.
Palmer, Max
Peralta, J.
Valles, P.
Gaia Collaboration
Keywords: Astrometria
Issue Date: 24-Nov-2016
Publisher: EDP Sciences
Abstract: Context. At about 1000 days after the launch of Gaia we present the first Gaia data release, Gaia DR1, consisting of astrometry and photometry for over 1 billion sources brighter than magnitude 20.7. Aims. A summary of Gaia DR1 is presented along with illustrations of the scientific quality of the data, followed by a discussion on the limitations due to the preliminary nature of this release. Methods. The raw data collected by Gaia during the first 14 months of the mission have been processed by the Gaia Data Processing and Analysis Consortium (DPAC) and turned into an astrometric and photometric catalogue. Results. Gaia DR1 consists of three components: a primary astrometric data set which contains the positions, parallaxes, and mean proper motions for about 2 million of the brightest stars in common with the Hipparcos and Tycho-2 catalogues - a realisation of the Tycho-Gaia Astrometric Solution (TGAS) - and a secondary astrometric data set containing the positions for an additional 1.1 billion sources. The second component is the photometric data set, consisting of mean G-band magnitudes for all sources. The G-band light curves and the characteristics of ∼ 3000 Cepheid and RR-Lyrae stars, observed at high cadence around the south ecliptic pole, form the third component. For the primary astrometric data set the typical uncertainty is about 0.3 mas for the positions and parallaxes, and about 1 mas yr−1for the proper motions. To the parallax uncertainties a systematic component of ∼ 0.3 mas should be added. For the subset of ∼ 94 000 Hipparcos stars in the primary data set the proper motions are much more precise, at about 0.06 mas yr−1 . For the secondary astrometric data set the typical uncertainty of the positions is ∼ 10 mas. The median uncertainties on the mean G-band magnitudes range from the mmag level to ∼ 0.03 mag over the magnitude range 5 to 20.7. Conclusions. Gaia DR1 is an important milestone ahead of the next Gaia data release, which will feature 5-parameter astrometry for all sources. Extensive validation shows that Gaia DR1 represents a major advance in the mapping of the heavens and the availability of basic stellar data that underpin observational astrophysics. Nevertheless the very preliminary nature of this first Gaia data release does lead to a number of important limitations to the data quality which should be carefully considered before drawing conclusions from the data.
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It is part of: Astronomy & Astrophysics, 2016, vol. 595, p. A2
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ISSN: 0004-6361
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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