[en] 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. <BR /> 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. <BR /> 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. <BR /> Results: Our best estimate of the acceleration based on Gaia EDR3 is (2.32 ± 0.16) × 10<SUP>−10</SUP> m s<SUP>−2</SUP> (or 7.33 ±0.51 km s<SUP>−1</SUP> 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<SUP>−1</SUP>. 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<SUP>−1</SUP>. <P />Movie is only available at <A href="https://www.aanda.org/10.1051/0004-6361/202039734/olm">https://www.aanda.org</A>
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gaia Collaboration; AB(Technical University of Dresden, Institute for Planetary Geodesy
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Mignard, F.; Lund Observatory
Lindegren, L.; Astronomisches Rechen-Institut
Bastian, U.; Lund Observatory
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Hernández, J.; Lund Observatory
Hobbs, D.; European Science and Astronomy Center
Ramos-Lerate, M.; Astronomisches Rechen-Institut
Biermann, M.; European Science and Astronomy Center
Bombrun, A.; European Science and Astronomy Center
de Torres, A.; Technical University of Dresden, Institute for Planetary Geodesy
Gerlach, E.; Technical University of Dresden, Institute for Planetary Geodesy
Geyer, R.; Technical University of Dresden, Institute for Planetary Geodesy
Hilger, T.; European Science and Astronomy Center
Lammers, U.; Technical University of Dresden, Institute for Planetary Geodesy
Steidelmüller, H.; European Science and Astronomy Center
Stephenson, C. A.; Leiden Observatory
Brown, A. G. A.; Astronomical Observatory of Padua
Vallenari, A.; European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201AZ, Noordwijk, The Netherlands
Prusti, T.; European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201AZ, Noordwijk, The Netherlands
de Bruijne, J. H. J.; Institute de Planetologie et d'Astrophysique de Grenoble, Observatoire de Paris, Laboratoire Galaxies Etoiles Physiques et Instrumentation
Babusiaux, C.; Observatoire de la Cote d'Azur, France
Creevey, O. L.; University of Cambridge, Institute of Astronomy
Evans, D. W.; University of Geneva, Astronomical Observatory
Eyer, L.; European Science and Astronomy Center
Hutton, A.; European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201AZ, Noordwijk, The Netherlands
Jansen, F.; Instituto de Ciencias del Cosmos, Barcelona
Jordi, C.; Instituto de Ciencias del Cosmos, Barcelona
Luri, X.; Centre National d'Etudes Spatiales, Toulouse
Panem, C.; Vrije Universiteit, Brussels, Astronomy and Astrophysics Research Group, -
Pourbaix, D.; Astronomical Observatory of Arcetri
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Davidson, M.; University of Liege, Department of Astrophysics, Geophysics and Oceanography
Delchambre, Ludovic ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Dell'Oro, A.; European Science and Astronomy Center
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García-Lario, P.; European Science and Astronomy Center
Garcia-Reinaldos, M.; European Science and Astronomy Center, University of Vigo, Spain
González-Núñez, J.; University of Liege, Department of Astrophysics, Geophysics and Oceanography, -
Gosset, Eric ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
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Harrison, D. L.; University of Athens, Department of Astronomy
Hatzidimitriou, D.; Uppsala University, Department of Physics and Astronomy
Heiter, U.; Universite de Lille I, France
Hestroffer, D.; University of Cambridge, Institute of Astronomy
Hodgkin, S. T.; University of Geneva, Astronomical Observatory, University of Geneva, Astronomical Observatory
Holl, B.; Leibniz Institute for Astrophysics, Potsdam
Janßen, K.; University of Geneva, Astronomical Observatory
Jevardat de Fombelle, G.; Astronomisches Rechen-Institut
Jordan, S.; University of Lisbon, Portugal, University of California, Irvine
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Lanzafame, A. C.; Astronomisches Rechen-Institut
Löffler, W.; European Science and Astronomy Center
Lorca, A.; University of Coruna, Spain
Manteiga, M.; Centre de Donnees Astronomiques, Strasbourg
Marchal, O.; Astronomical Observatory of Rome, ASI Science Data Center
Marrese, P. M.; University of Lisbon, Portugal
Moitinho, A.; European Science and Astronomy Center
Mora, A.; University of Helsinki, Department of Physics, Finnish Geospatial Research Institute
Muinonen, K.; University of Cambridge, Institute of Astronomy
Osborne, P.; Astronomical Observatory of Arcetri, ASI Science Data Center
Pancino, E.; Royal Observatory of Belgium
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Recio-Blanco, A.; Rutherford Appleton Laboratory
Richards, P. J.; University of Cambridge, Institute of Astronomy
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Roegiers, T.; Max-Planck-Institute for Astronomy, Heidelberg
Rybizki, J.; National University of Distance Education, Madrid, Spain
Sarro, L. M.; Vrije Universiteit, Brussels, Astronomy and Astrophysics Research Group
Siopis, C.; University College London, Mullard Space Science Laboratory
Smith, M.; Astronomical Observatory of Turin
Sozzetti, A.; University of Vigo, Spain
Ulla, A.; European Science and Astronomy Center
Utrilla, E.; University of Cambridge, Institute of Astronomy
van Leeuwen, M.; European Science and Astronomy Center
van Reeven, W.; Astronomical Observatory of Turin
Abbas, U.; European Science and Astronomy Center
Abreu Aramburu, A.; Thales Alenia Space, France
Accart, S.; Katholieke University of Leuven, Astronomical Institute, Radboud University Nijmegen, Department of Astronomy and Physics, Max-Planck-Institute for Astronomy, Heidelberg
Aerts, C.; National University of Distance Education, Madrid, Spain
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Ajaj, M.; Astronomical Observatory of Rome, ASI Science Data Center
Altavilla, G.; University of Coruna, Spain
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Alves, J.; European Southern Observatory, Germany
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Anglada Varela, E.; Instituto de Ciencias del Cosmos, Barcelona
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Barstow, M. A.; Instituto de Ciencias del Cosmos, Barcelona
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Bassilana, J. -L.; Universite de Lille I, France
Bauchet, N.; Thales Alenia Space, France
Baudesson-Stella, A.; Astronomical Observatory of Catania
Becciani, U.; Astronomical Observatory of Bologna
Bellazzini, M.; Instituto de Ciencias del Cosmos, Barcelona
Bernet, M.; Center for Research and Exploration in Space Science & Technology, -, Astronomical Observatory of Turin
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Blanco-Cuaresma, S.; Centre de Donnees Astronomiques, Strasbourg
Boch, T.; University of Porto, Center for Astrophysics
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Breedt, E.; SISSA, International School for Advanced Studies, Italy
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Brouillet, N.; Astronomical Observatory of Turin
Bucciarelli, B.; Centre National d'Etudes Spatiales, Toulouse
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Cancelliere, R.; European Science and Astronomy Center
Cánovas, H.; Instituto de Ciencias del Cosmos, Barcelona
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Cowell, S.; Observatoire de Paris, Laboratoire Galaxies Etoiles Physiques et Instrumentation
Crifo, F.; Astronomical Observatory of Turin
Crosta, M.; European Science and Astronomy Center
Crowley, C.; University of Coruna, Spain
Dafonte, C.; National Observatory of Athens, Greece
Dapergolas, A.; University of Antwerpen, Belgium
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de Laverny, P.; Astronomical Observatory of Teramo
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de Teodoro, P.; Astronomisches Rechen-Institut
del Peloso, E. F.; European Science and Astronomy Center
del Pozo, E.; University of Cambridge, Institute of Astronomy
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