aa33051-18.pdf (11.34 MB)
Download file

Gaia Data Release 2: Summary of the contents and survey properties

Download (11.34 MB)
journal contribution
posted on 28.08.2019, 09:11 by AGA Brown, A Vallenari, T Prusti, JHJ de Bruijne, C Babusiaux, CAL Bailer-Jones, M Biermann, DW Evans, L Eyer, F Jansen, C Jordi, A Mora, K Muinonen, J Osinde, E Pancino, T Pauwels, J-M Petit, A Recio-Blanco, PJ Richards, L Rimoldini, AC Robin, SA Klioner, LM Sarro, C Siopis, M Smith, A Sozzetti, M Sueveges, J Torra, W van Reeven, U Abbas, AA Aramburu, S Accart, U Lammers, C Aerts, G Altavilla, MA Alvarez, R Alvarez, J Alves, RI Anderson, AH Andrei, E Anglada Varela, E Antiche, T Antoja, L Lindegren, B Arcay, TL Astraatmadja, N Bach, SG Baker, L Balaguer-Nunez, P Balm, C Barache, C Barata, D Barbato, F Barblan, X Luri, PS Barklem, D Barrado, M Barros, MA Barstow, S Bartholome Munoz, J-L Bassilana, U Becciani, M Bellazzini, A Berihuete, S Bertone, F Mignard, L Bianchi, O Bienayme, S Blanco-Cuaresma, T Boch, C Boeche, A Bombrun, R Borrachero, D Bossini, S Bouquillon, G Bourda, C Panem, A Bragaglia, L Bramante, MA Breddels, A Bressan, N Brouillet, T Bruesemeister, E Brugaletta, B Bucciarelli, A Burlacu, D Busonero, D Pourbaix, AG Butkevich, R Buzzi, E Caffau, R Cancelliere, G Cannizzaro, T Cantat-Gaudin, R Carballo, T Carlucci, JM Carrasco, L Casamiquela, S Randich, M Castellani, A Castro-Ginard, P Charlot, L Chemin, A Chiavassa, G Cocozza, G Costigan, S Cowell, F Crifo, M Crosta, P Sartoretti, C Crowley, J Cuypers, C Dafonte, Y Damerdji, A Dapergolas, P David, M David, P de Laverny, F De Luise, R De March, HI Siddiqui, D de Martino, R de Souza, A de Torres, J Debosscher, E del Pozo, M Delbo, A Delgado, HE Delgado, P Di Matteo, S Diakite, C Soubiran, C Diener, E Distefano, C Dolding, P Drazinos, J Duran, B Edvardsson, H Enke, K Eriksson, P Esquej, G Eynard Bontemps, F van Leeuwen, C Fabre, M Fabrizio, S Faigler, AJ Falcao, M Farras Casas, L Federici, G Fedorets, P Fernique, F Figueras, F Filippi, NA Walton, K Findeisen, A Fonti, E Fraile, M Fraser, B Frezouls, M Gai, S Galleti, D Garabato, F Garcia-Sedano, A Garofalo, F Arenou, N Garralda, A Gavel, P Gavras, J Gerssen, R Geyer, P Giacobbe, G Gilmore, S Girona, G Giuffrida, F Glass, U Bastian, M Gomes, M Granvik, A Gueguen, A Guerrier, J Guiraud, R Gutierrez-Sanchez, R Haigron, D Hatzidimitriou, M Hauser, M Haywood, M Cropper, U Heiter, A Helmi, J Heu, T Hilger, D Hobbs, W Hofmann, G Holland, HE Huckle, A Hypki, V Icardi, R Drimmel, K Janssen, G Jevardat de Fombelle, PG Jonker, AL Juhasz, F Julbe, A Karampelas, A Kewley, J Klar, A Kochoska, R Kohley, D Katz, K Kolenberg, M Kontizas, E Kontizas, SE Koposov, G Kordopatis, Z Kostrzewa-Rutkowska, P Koubsky, S Lambert, AF Lanza, Y Lasne, MG Lattanzi, J-B Lavigne, Y Le Fustec, C Le Poncin-Lafitte, Y Lebreton, S Leccia, N Leclerc, I Lecoeur-Taibi, H Lenhardt, F Leroux, S Liao, J Bakker, E Licata, HEP Lindstrom, TA Lister, E Livanou, A Lobel, M Lopez, S Managau, RG Mann, G Mantelet, O Marchal, C Cacciari, JM Marchant, M Marconi, S Marinoni, G Marschalko, DJ Marshall, M Martino, G Marton, N Mary, D Massari, G Matijevic, J Castaneda, T Mazeh, PJ McMillan, S Messina, D Michalik, NR Millar, D Molina, R Molinaro, L Molnar, P Montegriffo, R Mor, L Chaoul, R Morbidelli, T Morel, D Morris, AF Mulone, T Muraveva, I Musella, G Nelemans, L Nicastro, L Noval, W O'Mullane, N Cheek, C Ordenovic, D Ordonez-Blanco, P Osborne, C Pagani, I Pagano, F Pailler, H Palacin, L Palaversa, A Panahi, M Pawlak, F De Angeli, AM Piersimoni, F-X Pineau, E Plachy, G Plum, E Poggio, E Poujoulet, A Prsa, L Pulone, E Racero, S Ragaini, C Fabricius, N Rambaux, M Ramos-Lerate, S Regibo, C Reyle, F Riclet, V Ripepi, A Riva, A Rivard, G Rixon, T Roegiers, R Guerra, M Roelens, M Romero-Gomez, N Rowell, F Royer, L Ruiz-Dern, G Sadowski, T Sagrista Selles, J Sahlmann, J Salgado, E Salguero, B Holl, N Sanna, T Santana-Ros, M Sarasso, H Savietto, M Schultheis, E Sciacca, M Segol, JC Segovia, D Segransan, I-C Shih, E Masana, L Siltala, AF Silva, RL Smart, KW Smith, E Solano, F Solitro, R Sordo, S Soria Nieto, J Souchay, A Spagna, R Messineo, F Spoto, U Stampa, IA Steele, H Steidelmueller, CA Stephenson, H Stoev, FF Suess, J Surdej, L Szabados, E Szegedi-Elek, N Mowlavi, D Tapiador, F Taris, G Tauran, MB Taylor, R Teixeira, D Terrett, P Teyssandier, W Thuillot, A Titarenko, F Torra Clotet, K Nienartowicz, C Turon, A Ulla, E Utrilla, S Uzzi, M Vaillant, G Valentini, V Valette, A van Elteren, E Van Hemelryck, M van Leeuwen, P Panuzzo, M Vaschetto, A Vecchiato, J Veljanoski, Y Viala, D Vicente, S Vogt, C von Essen, H Voss, V Votruba, S Voutsinas, J Portell, G Walmsley, M Weiler, O Wertz, T Wevers, L Wyrzykowski, A Yoldas, M Zerjal, H Ziaeepour, J Zorec, S Zschocke, M Riello, S Zucker, C Zurbach, T Zwitter, GM Seabroke, P Tanga, F Thevenin, G Gracia-Abril, G Comoretto, M Garcia-Reinaldos, D Teyssier, M Altmann, R Andrae, M Audard, I Bellas-Velidis, K Benson, J Berthier, R Blomme, P Burgess, G Busso, B Carry, A Cellino, G Clementini, M Clotet, O Creevey, M Davidson, J De Ridder, L Delchambre, A Dell'Oro, C Ducourant, J Fernandez-Hernandez, M Fouesneau, Y Fremat, L Galluccio, M Garcia-Torres, J Gonzalez-Nunez, JJ Gonzalez-Vidal, E Gosset, LP Guy, J-L Halbwachs, NC Hambly, DL Harrison, J Hernandez, D Hestroffer, ST Hodgkin, A Hutton, G Jasniewicz, A Jean-Antoine-Piccolo, S Jordan, AJ Korn, A Krone-Martins, AC Lanzafame, T Lebzelter, W Loeffler, M Manteiga, PM Marrese, JM Martin-Fleitas, A Moitinho
Context. We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter than magnitude 21. In addition epoch astrometry and photometry are provided for a modest sample of minor planets in the solar system. Aims. A summary of the contents of Gaia DR2 is presented, accompanied by a discussion on the differences with respect to Gaia DR1 and an overview of the main limitations which are still present in the survey. Recommendations are made on the responsible use of Gaia DR2 results. Methods. The raw data collected with the Gaia instruments during the first 22 months of the mission have been processed by the Gaia Data Processing and Analysis Consortium (DPAC) and turned into this second data release, which represents a major advance with respect to Gaia DR1 in terms of completeness, performance, and richness of the data products. Results. Gaia DR2 contains celestial positions and the apparent brightness in G for approximately 1.7 billion sources. For 1.3 billion of those sources, parallaxes and proper motions are in addition available. The sample of sources for which variability information is provided is expanded to 0.5 million stars. This data release contains four new elements: broad-band colour information in the form of the apparent brightness in the GBP (330–680 nm) and GRP (630–1050 nm) bands is available for 1.4 billion sources; median radial velocities for some 7 million sources are presented; for between 77 and 161 million sources estimates are provided of the stellar effective temperature, extinction, reddening, and radius and luminosity; and for a pre-selected list of 14 000 minor planets in the solar system epoch astrometry and photometry are presented. Finally, Gaia DR2 also represents a new materialisation of the celestial reference frame in the optical, the Gaia-CRF2, which is the first optical reference frame based solely on extragalactic sources. There are notable changes in the photometric system and the catalogue source list with respect to Gaia DR1, and we stress the need to consider the two data releases as independent. Conclusions. Gaia DR2 represents a major achievement for the Gaia mission, delivering on the long standing promise to provide parallaxes and proper motions for over 1 billion stars, and representing a first step in the availability of complementary radial velocity and source astrophysical information for a sample of stars in the Gaia survey which covers a very substantial fraction of the volume of our galaxy.

Funding

This work presents results from the European Space Agency (ESA) space mission Gaia. Gaia data are being processed by the Gaia Data Processing and Analysis Consortium (DPAC). Funding for the DPAC is provided by national institutions, in particular the institutions participating in the Gaia MultiLateral Agreement (MLA). The Gaia mission website is https: //www.cosmos.esa.int/gaia. The Gaia Archive website is http://gea. esac.esa.int/archive/. The Gaia mission and data processing have financially been supported by, in alphabetical order by country: the Algerian Centre de Recherche en Astronomie, Astrophysique et Géophysique of Bouzareah Observatory; the Austrian Fonds zur Förderung der wissenschaftlichen Forschung (FWF) Hertha Firnberg Programme through grants T359, P20046, and P23737; the BELgian federal Science Policy Office (BELSPO) through various PROgramme de Développement d’EXpériences scientifiques (PRODEX) grants and the Polish Academy of Sciences - Fonds Wetenschappelijk Onderzoek through grant VS.091.16N; the Brazil-France exchange programmes Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Coordenação de Aperfeicoamento de Pessoal de Nível Superior (CAPES) - Comité Français d’Evaluation de la Coopération Universitaire et Scientifique avec le Brésil (COFECUB); the Chilean Dirección de Gestión de la Investigación (DGI) at the University of Antofagasta and the Comité Mixto ESO-Chile; the National Science Foundation of China (NSFC) through grants 11573054 and 11703065; the CzechRepublic Ministry of Education, Youth, and Sports through grant LG 15010, the Czech Space Office through ESA PECS contract 98058, and Charles University Prague through grant PRIMUS/SCI/17; the Danish Ministry of Science; the Estonian Ministry of Education and Research through grant IUT40-1; the European Commission’s Sixth Framework Programme through the European Leadership in Space Astrometry (ELSA) Marie Curie Research Training Network (MRTN-CT-2

History

Citation

Astronomy and Astrophysics, 2018, 616, A1

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Astronomy and Astrophysics

Publisher

EDP Sciences for European Southern Observatory (ESO)

issn

1432-0746

Acceptance date

14/04/2018

Copyright date

2018

Available date

28/08/2019

Publisher version

https://www.aanda.org/articles/aa/abs/2018/08/aa33051-18/aa33051-18.html

Language

en