• DOI:10.1051/0004-6361/202039834
• Corpus ID: 227254300

Gaia Early Data Release 3

@article{Collaboration2020GaiaED,
  title={Gaia Early Data Release 3},
  author={Gaia Collaboration and A. G. A. Brown and Antonella Vallenari and Timo Prusti and Jos H.J. de Bruijne and C. Babusiaux and Michael Biermann and Orlagh L. Creevey and D. W. Evans and Laurent Eyer and Alexander Hutton and Fred A. Jansen and C. Jordi and Sergei A. Klioner and Uwe Lammers and Lennart Lindegren and Xavier Luri and Franccois Mignard and Chantal Panem and Dimitri Pourbaix and Sofia Randich and Paola Sartoretti and Caroline Soubiran and Nancy A. Walton and Fr{\'e}d{\'e}ric Arenou and Coryn A. L. Bailer-Jones and Ulrich Bastian and Mark S. Cropper and Ronald Drimmel and Daniel Martin Katz and Mario Gilberto Lattanzi and Floor van Leeuwen and Joost M. Bakker and Carla Cacciari and Javier Casta{\~n}eda and Francesca De Angeli and Christine Ducourant and Claus Fabricius and Morgan Fouesneau and Yves Fr'emat and R. Guerra and A. Guerrier and Julien Guiraud and Arianna Piccolo and Eduard Masana and Rosario Messineo and Nami Mowlavi and C. Nicolas and Krzysztof Nienartowicz and Fr{\'e}d{\'e}ric Pailler and Pasquale Panuzzo and F. Riclet and W. Roux and George Seabroke and Rosanna Sordo and P. Tanga and F. Th'evenin and G. Gracia-Abril and Jordi Portell and David Teyssier and Martin Altmann and Ren{\'e} Andrae and Ioannis Bellas-Velidis and Kevin Benson and J{\'e}r{\^o}me Berthier and Ronny Blomme and E. Brugaletta and P. W. Burgess and Giorgia Busso and Beno{\^i}t Carry and A Cellino and N. Cheek and G. Clementini and Yassine Damerdji and Michael Davidson and Ludovic Delchambre and Aldo Dell’Oro and J. Fern'andez-Hern'andez and Laurent Galluccio and Pedro Garc'ia-Lario and M. Garcia-Reinaldos and J. Gonz'alez-N'unez and Eric Gosset and R{\'e}gis Haigron and J. L. Halbwachs and Nigel C. Hambly and D L Harrison and Despina Hatzidimitriou and Ulrike Heiter and J. I. Gonz'alez Hern'andez and D. Hestroffer and Simon T. Hodgkin and Berry Holl and Katja Janssen and Gr{\'e}gory Jevardat de Fombelle and Stefan Jordan and Alberto Krone-Martins and Alessandro C. Lanzafame and W. L offler and Alejandro Lorca and Minia Manteiga and Olivier Marchal and P. M. Marrese and Andr{\'e} Moitinho and Andr{\'e} Mora and Karri Muinonen and P. J. Osborne and Elena Pancino and Th. Pauwels and J. M. Petit and Alejandra Recio-Blanco and P. J. Richards and M. Riello and Lorenzo Rimoldini and Annie C. Robin and T. G. R. Roegiers and Jan Rybizki and Luis M. Sarro and Christos Siopis and M. W. L. Smith and Alessandro Sozzetti and Ana Ulla and E. Utrilla and M. van Leeuwen and Wouter van Reeven and Ummi Abbas and Asier A. Aramburu and S. Accart and Conny Aerts and Juan J. Aguado and M. Ajaj and G. Altavilla and Marco Antonio {\'A}lvarez and Javier {\'A}lvarez Cid-Fuentes and Jo{\~a}o Alves and Richard I. Anderson and E. Anglada Varela and T. Antoja and Marc Audard and Deborah Baines and Stephen Baker and Lola Balaguer-N'unez and Eduardo Balbinot and Zolt{\'a}n Balog and Christophe Barache and Domenico Barbato and M. Barros and Martin A. Barstow and S. Bartolom'e and J.-L. Bassilana and N. Bauchet and A. Baudesson-Stella and Ugo Becciani and Michele Bellazzini and Martin Bernet and Stefano Bertone and Luciana Bianchi and Sergi Blanco-Cuaresma and Thomas Boch and Alex Bombrun and Diego Bossini and Sandrine Bouquillon and Angela Bragaglia and Lorenzo Bramante and Elm{\'e} Breedt and Alessandro Bressan and Nathalie Brouillet and Beatrice Bucciarelli and Alexandru Burlacu and Deborah Busonero and Alexey G. Butkevich and Raffaella Buzzi and Elisabetta Caffau and Rossella Cancelliere and H'ector C'anovas and Tristan Cantat-Gaudin and Ruth Carballo and T. Carlucci and Manuel Carnerero and Josep Manel Carrasco and Laia Casamiquela and Marco Castellani and Alfred Castro-Ginard and P. Castro Sampol and Laurence Chaoul and Patrick Charlot and Laurent Chemin and Andrea Chiavassa and Maria-Rosa L. Cioni and Gabriele Comoretto and W. J. Cooper and Trish Cornez and Shannon Cowell and F. Crifo and Mariateresa Crosta and C. M. Crowley and Carlos Dafonte and Anastasos Dapergolas and M. David and Pedro David and Patrick de Laverny and Fiore De Luise and Ruben De March and Joris De Ridder and Regina de Souza and Pilar de Teodoro and Anthony D. Torres and E. F. del Peloso and E. del Pozo and Marco Delbo’ and Ademar Tavares Delgado and H{\'e}ctor E. Delgado and Jean-Baptiste Delisle and P. Di Matteo and S. Diakit{\'e} and Catrina Diener and Elisa Distefano and Chris Dolding and D. Eappachen and Bengt Edvardsson and Harry Enke and Pilar Esquej and C{\'e}cile Fabre and Michele Fabrizio and Simchon Faigler and Grigori Fedorets and Pierre Fernique and A. Fienga and Francesca Figueras and Celine Fouron and Francesca Fragkoudi and Eduardo Miguel Gonz{\'a}lez Fraile and F. Franke and Mario Gai and Daniel Garabato and Adri{\'a}n Garc{\'i}a-Guti{\'e}rrez and M. Garc'ia-Torres and Alessia Garofalo and Panagiotis Gavras and Enrico Gerlach and Reiner Geyer and Paolo Giacobbe and Gerry Gilmore and Sergi Girona and Gaetano Giuffrida and Roy Gomel and Ana E. G{\'o}mez and Iker Gonz{\'a}lez-Santamar{\'i}a and J. J. Gonz'alez-Vidal and Mikael Granvik and R. Guti'errez-S'anchez and Leanne P. Guy and Marcus Hauser and M. Haywood and Amina Helmi and Sebastian L. Hidalgo and Thomas Hilger and Natalia Hładczuk and David Hobbs and G. Holland and Howard E. Huckle and G{\'e}rard Jasniewicz and Peter G. Jonker and J. Juaristi Campillo and Francesc Julb{\'e} and Lea Karbevska and P. Kervella and Shourya Khanna and Angela Kochoska and Mary Kontizas and Georges Kordopatis and Andreas Korn and Zuzanna Kostrzewa-Rutkowska and Katarzyna Kruszy'nska and S. Lambert and A. F. Lanza and Yannick Lasne and Jean Francois Le Campion and Y. Le Fustec and Yveline Lebreton and Thomas Lebzelter and S. Leccia and Nicolas Leclerc and Isabelle Lecoeur-Taibi and Shi-long Liao and Enrico Licata and H. E. P. Lindstr{\o}m and Tim A. Lister and E. Livanou and A. Lobel and P. Madrero Pardo and S. Managau and Robert G. Mann and Jonathan M. Marchant and Marcella Marconi and M.M.S. Marcos Santos and S. Marinoni and Federico Marocco and Douglas J. Marshall and L. Martin Polo and J. M. Mart'in-Fleitas and A. Masip and Davide Massari and Alessandra Mastrobuono-Battisti and T Mazeh and Paul J. McMillan and Sergio Messina and Daniel Michalik and N. R. Millar and Alexey Mints and David Molina and Roberto Molinaro and L. Moln'ar and P. Montegriffo and R. Mor and Roberto Morbidelli and Thierry Morel and D. Morris and Angelo Fabio Mulone and D. Munoz and Tatiana Muraveva and Caroline P. Murphy and Ilaria Musella and L. Noval and C. Ord'enovic and Giovanna Orr{\'u} and J. O. Osinde and Claudio Pagani and Isabella Pagano and Lovro Palaversa and Pedro Alonso Palicio and Aviad Panahi and Michał Pawlak and X. Pe{\~n}alosa Esteller and A. Penttil a and Anna Marina Piersimoni and F.-X. Pineau and Emese Plachy and G. Plum and Eloisa Poggio and Ennio Poretti and E. Poujoulet and Andrej Prvsa and L. Pulone and Elena Racero and Simone Ragaini and Monica Rainer and Claudia M. Raiteri and N. Rambaux and P. Ramos and Mercedes Ramos-lerate and Paola Re Fiorentin and Sara Regibo and C'eline Reyl'e and Vincenzo Ripepi and Alberto Riva and Guy Rixon and Noel Robichon and Caroline Robin and Maroussia Roelens and L. B. Johnston Rohrbasser and Merce Romero-G'omez and Nick Rowell and Fr{\'e}d{\'e}ric Royer and Krzysztof A. Rybicki and Gilles Sadowski and A. Sagrista Sell'es and Johannes Sahlmann and Jes{\'u}s J. Salgado and E. Salguero and Nicholas Samaras and V. Sanchez Gimenez and Nico Sanna and Ra{\'u}l Santove{\~n}a and Maria Sarasso and Mathias Schultheis and Eva Sciacca and Matthieu S{\'e}gol and Juan Carlos Segovia and Damien S'egransan and D. Semeux and Sahar Shahaf and H. Siddiqui and Arnaud Siebert and Lauri Siltala and {\'E}ric Slezak and Richard L. Smart and Enrique Solano and Filomena Solitro and D Souami and Jean J Souchay and Alessandro Spagna and Federica Spoto and Iain A. Steele and H. Steidelm uller and Craig Stephenson and M. S uveges and L{\'a}szl{\'o} Szabados and Elza Szegedi-Elek and François Taris and G. Tauran and M. B. Taylor and R. Teixeira and William Thuillot and Nadia Tonello and F. Torra and Jordi Torra and C. Turon and N Unger and M. Vaillant and E. van Dillen and Olivier Vanel and Alberto Vecchiato and Y. P. Viala and D. Vicente and S. Voutsinas and Michael J. Weiler and Thomas Wevers and Lukasz Wyrzykowski and Aybuke Kupcu Yoldas and P. Yvard and H. Zhao and Juan Zorec and Shay Zucker and Christine Zurbach and Toma{\vz} Zwitter},
  journal={Astronomy \& Astrophysics},
  year={2020}
}

• Gaia Collaboration, A. Brown, +423 authors T. Zwitter
• Published 20 November 2020
• Physics
• Astronomy & Astrophysics

Context. Gaia Early Data Release 3 (Gaia EDR3) provides accurate astrometry for about 1.6 million compact (QSO-like) extragalactic sources, 1.2 million of which have the best-quality five-parameter astrometric solutions.
Aims. The proper motions of QSO-like sources are used to reveal a systematic pattern due to the acceleration of the solar systembarycentre with respect to the rest frame of the Universe. Apart from being an important scientific result by itself, the acceleration measured in this way is a good quality indicator of the Gaia astrometric solution.
Methods. Theeffect of the acceleration was obtained as a part of the general expansion of the vector field of proper motions in vector spherical harmonics (VSH). Various versions of the VSH fit and various subsets of the sources were tried and compared to get the most consistent result and a realistic estimate of its uncertainty. Additional tests with the Gaia astrometric solution were used to get a better idea of the possible systematic errors in the estimate.
Results. Our best estimate of the acceleration based on Gaia EDR3 is (2.32 ± 0.16) × 10−10 m s−2 (or 7.33 ±0.51 km s−1 Myr−1) towards α = 269.1° ± 5.4°, δ = −31.6° ± 4.1°, corresponding to a proper motion amplitude of 5.05 ±0.35 μas yr−1. This is in good agreement with the acceleration expected from current models of the Galactic gravitational potential. We expect that future Gaia data releases will provide estimates of the acceleration with uncertainties substantially below 0.1 μas yr−1.