Gaia CollaborationKlioner, S. A.S. A.KlionerMignard, F.F.MignardLindegren, L.L.LindegrenBastian, U.U.BastianMcMillan, P. J.P. J.McMillanHernández, J.J.HernándezHobbs, D.D.HobbsRamos-Lerate, M.M.Ramos-LerateBiermann, M.M.BiermannBombrun, A.A.BombrunCantat-Gaudin, T.T.Cantat-GaudinCarballo, R.R.CarballoCarlucci, T.T.CarlucciCARNERERO MARTIN, Maria IsabelMaria IsabelCARNERERO MARTINCarrasco, J. M.J. M.CarrascoCasamiquela, L.L.CasamiquelaCASTELLANI, MarcoMarcoCASTELLANICastro-Ginard, A.A.Castro-GinardCastro Sampol, P.P.Castro SampolVALLENARI, AntonellaAntonellaVALLENARIHodgkin, S. T.S. T.HodgkinChaoul, L.L.ChaoulCharlot, P.P.CharlotChemin, L.L.CheminChiavassa, A.A.ChiavassaCOMORETTO, GiovanniGiovanniCOMORETTOCooper, W. J.W. J.CooperCornez, T.T.CornezCowell, S.S.CowellCrifo, F.F.CrifoCROSTA, MariateresaMariateresaCROSTAHoll, B.B.HollPrusti, T.T.PrustiCrowley, C.C.CrowleyDafonte, C.C.DafonteDapergolas, A.A.DapergolasDavid, M.M.DavidDavid, P.P.Davidde Laverny, P.P.de LavernyDE LUISE, FioreFioreDE LUISEDe March, R.R.De MarchDe Ridder, J.J.De RidderJanßen, K.K.Janßende Souza, R.R.de Souzade Bruijne, J. H. J.J. H. J.de Bruijnede Teodoro, P.P.de Teodorodel Peloso, E. F.E. F.del Pelosodel Pozo, E.E.del PozoDelgado, A.A.DelgadoDelgado, H. E.H. E.DelgadoDelisle, J. -B.J. -B.DelisleDi Matteo, P.P.Di MatteoDiakite, S.S.DiakiteJevardat de Fombelle, G.G.Jevardat de FombelleDiener, C.C.DienerDISTEFANO, Elisa Maria CarmelaElisa Maria CarmelaDISTEFANOBabusiaux, C.C.BabusiauxDolding, C.C.DoldingEappachen, D.D.EappachenEnke, H.H.EnkeEsquej, P.P.EsquejFabre, C.C.FabreFABRIZIO, MicheleMicheleFABRIZIOFaigler, S.S.FaiglerJordan, S.S.JordanFedorets, G.G.FedoretsFernique, P.P.FerniqueFienga, A.A.FiengaCreevey, O. L.O. L.CreeveyFigueras, F.F.FiguerasFouron, C.C.FouronFragkoudi, F.F.FragkoudiFraile, E.E.FraileFranke, F.F.FrankeGAI, MarioMarioGAIKrone-Martins, A.A.Krone-MartinsGarabato, D.D.GarabatoGarcia-Gutierrez, A.A.Garcia-GutierrezGarcía-Torres, M.M.García-TorresGAROFALO, AlessiaAlessiaGAROFALOEvans, D. W.D. W.EvansGavras, P.P.GavrasGIACOBBE, PaoloPaoloGIACOBBEGilmore, G.G.GilmoreGirona, S.S.GironaGiuffrida, G.G.GiuffridaLanzafame, Alessandro CarmeloAlessandro CarmeloLanzafameGomez, A.A.GomezGonzalez-Santamaria, I.I.Gonzalez-SantamariaGonzález-Vidal, J. J.J. J.González-VidalGranvik, M.M.GranvikGutiérrez-Sánchez, R.R.Gutiérrez-SánchezEyer, L.L.EyerGuy, L. P.L. P.GuyHauser, M.M.HauserHaywood, M.M.HaywoodHelmi, A.A.HelmiLöffler, W.W.LöfflerHidalgo, S. L.S. L.HidalgoHładczuk, N.N.HładczukHolland, G.G.HollandHuckle, H. E.H. E.HuckleJasniewicz, G.G.JasniewiczJonker, P. G.P. G.JonkerHutton, A.A.HuttonJuaristi Campillo, J.J.Juaristi CampilloJulbe, F.F.JulbeKarbevska, L.L.KarbevskaLorca, A.A.LorcaKervella, P.P.KervellaKhanna, S.S.KhannaKochoska, A.A.KochoskaKordopatis, G.G.KordopatisKorn, A. J.A. J.KornKostrzewa-Rutkowska, Z.Z.Kostrzewa-RutkowskaKruszyńska, K.K.KruszyńskaJansen, F.F.JansenLambert, S.S.LambertLANZA, Antonino FrancescoAntonino FrancescoLANZAManteiga, M.M.ManteigaLasne, Y.Y.LasneLe Campion, J. -F.J. -F.Le CampionLe Fustec, Y.Y.Le FustecLebreton, Y.Y.LebretonLebzelter, T.T.LebzelterLECCIA, SilvioSilvioLECCIALeclerc, N.N.LeclercLecoeur-Taibi, I.I.Lecoeur-TaibiJordi, C.C.JordiLiao, S.S.Liaode Torres, A.A.de TorresLICATA, ENRICOENRICOLICATALindstrøm, H. E. P.H. E. P.LindstrømLister, T. A.T. A.ListerLivanou, E.E.LivanouLobel, A.A.LobelMadrero Pardo, P.P.Madrero PardoManagau, S.S.ManagauMann, R. G.R. G.MannMarchant, J. M.J. M.MarchantLuri, X.X.LuriMarchal, O.O.MarchalMARCONI, MarcellaMarcellaMARCONIMarcos Santos, M. M. S.M. M. S.Marcos SantosMARINONI, SILVIASILVIAMARINONIMarocco, F.F.MaroccoMarshall, D. J.D. J.MarshallPolo, L. MartinL. MartinPoloMartín-Fleitas, J. M.J. M.Martín-FleitasMasip, A.A.MasipMassari, D.D.MassariMastrobuono-Battisti, A.A.Mastrobuono-BattistiMARRESE, Paola MariaPaola MariaMARRESEPanem, C.C.PanemMazeh, T.T.MazehMESSINA, SergioSergioMESSINAMichalik, D.D.MichalikMillar, N. R.N. R.MillarMints, A.A.MintsMolina, D.D.MolinaMOLINARO, RobertoRobertoMOLINAROMolnár, L.L.MolnárMONTEGRIFFO, PaoloPaoloMONTEGRIFFOMoitinho, A.A.MoitinhoMor, R.R.MorPourbaix, D.D.PourbaixMORBIDELLI, RobertoRobertoMORBIDELLIMorel, T.T.MorelMorris, D.D.MorrisMulone, A. F.A. F.MuloneMunoz, D.D.MunozMuraveva, TatianaTatianaMuravevaMurphy, C. P.C. P.MurphyMUSELLA, ILARIAILARIAMUSELLAMora, A.A.MoraNoval, L.L.NovalOrdénovic, C.C.OrdénovicRANDICH, Maria SofiaMaria SofiaRANDICHOrrù, G.G.OrrùOsinde, J.J.OsindePagani, C.C.PaganiPAGANO, IsabellaIsabellaPAGANOPalaversa, L.L.PalaversaPalicio, P. A.P. A.PalicioPanahi, A.A.PanahiMuinonen, K.K.MuinonenPawlak, M.M.PawlakPe\-nalosa Esteller, X.X.Pe\-nalosa EstellerPenttilä, A.A.PenttiläSartoretti, P.P.SartorettiPIERSIMONI, Anna MarinaAnna MarinaPIERSIMONIPineau, F. -X.F. -X.PineauPlachy, E.E.PlachyPlum, G.G.PlumPoggio, EloisaEloisaPoggioPORETTI, EnnioEnnioPORETTIOsborne, P.P.OsbornePoujoulet, E.E.PoujouletPrša, A.A.PršaPULONE, LuigiLuigiPULONERacero, E.E.RaceroSoubiran, C.C.SoubiranRagaini, S.S.RagainiRAINER, MonicaMonicaRAINERRAITERI, Claudia MariaClaudia MariaRAITERIRambaux, N.N.RambauxRamos, P.P.RamosPANCINO, ELENAELENAPANCINORE FIORENTIN, PaolaPaolaRE FIORENTINRegibo, S.S.RegiboReylé, C.C.ReyléRIPEPI, VincenzoVincenzoRIPEPIRIVA, AlbertoAlbertoRIVAWalton, N. A.N. A.WaltonRixon, G.G.RixonRobichon, N.N.RobichonRobin, C.C.RobinRoelens, M.M.RoelensPauwels, T.T.PauwelsRohrbasser, L.L.RohrbasserRomero-Gómez, M.M.Romero-GómezRowell, N.N.RowellRoyer, F.F.RoyerRybicki, K. A.K. A.RybickiSadowski, G.G.SadowskiArenou, F.F.ArenouSagristà Sellés, A.A.Sagristà SellésSahlmann, J.J.SahlmannSalgado, J.J.SalgadoRecio-Blanco, A.A.Recio-BlancoSalguero, E.E.SalgueroSamaras, N.N.SamarasSanchez Gimenez, V.V.Sanchez GimenezSANNA, NicolettaNicolettaSANNASantoveña, R.R.SantoveñaSARASSO, Maria MargheritaMaria MargheritaSARASSOSchultheis, M.M.SchultheisBailer-Jones, C. A. L.C. A. L.Bailer-JonesSCIACCA, EvaEvaSCIACCASegol, M.M.SegolRichards, P. J.P. J.RichardsSegovia, J. C.J. C.SegoviaSégransan, D.D.SégransanSemeux, D.D.SemeuxSiddiqui, H. I.H. I.SiddiquiSiebert, A.A.SiebertSiltala, L.L.SiltalaSlezak, E.E.SlezakSMART, Richard LaurenceRichard LaurenceSMARTCropper, M.M.CropperSolano, E.E.SolanoGerlach, E.E.GerlachSolitro, F.F.SolitroSouami, D.D.SouamiSouchay, J.J.SouchaySPAGNA, AlessandroAlessandroSPAGNASpoto, F.F.SpotoSteele, I. A.I. A.SteeleSüveges, M.M.SüvegesSzabados, L.L.SzabadosSzegedi-Elek, E.E.Szegedi-ElekDRIMMEL, RonaldRonaldDRIMMELRiello, M.M.RielloTaris, F.F.TarisTauran, G.G.TauranTaylor, M. B.M. B.TaylorTeixeira, R.R.TeixeiraThuillot, W.W.ThuillotTonello, N.N.TonelloTorra, F.F.TorraTorray, J.J.TorrayTuron, C.C.TuronUnger, N.N.UngerRimoldini, L.L.RimoldiniKatz, D.D.KatzVaillant, M.M.Vaillantvan Dillen, E.E.van DillenVanel, O.O.VanelVECCHIATO, AlbertoAlbertoVECCHIATOViala, Y.Y.VialaVicente, D.D.VicenteVoutsinas, S.S.VoutsinasWeiler, M.M.WeilerWevers, T.T.WeversRobin, A. C.A. C.RobinWyrzykowski, Ł.Ł.WyrzykowskiLATTANZI, Mario GilbertoMario GilbertoLATTANZIYoldas, A.A.YoldasYvard, P.P.YvardZhao, H.H.ZhaoZorec, J.J.ZorecZucker, S.S.ZuckerZurbach, C.C.ZurbachZwitter, T.T.Zwittervan Leeuwen, F.F.van LeeuwenRoegiers, T.T.RoegiersBakker, J.J.BakkerCastañeda, J.J.CastañedaDe Angeli, F.F.De AngeliDucourant, C.C.DucourantFabricius, C.C.FabriciusFouesneau, M.M.FouesneauFrémat, Y.Y.FrématGuerra, R.R.GuerraGuerrier, A.A.GuerrierGuiraud, J.J.GuiraudRybizki, J.J.RybizkiJean-Antoine Piccolo, A.A.Jean-Antoine PiccoloMasana, E.E.MasanaMessineo, R.R.MessineoMowlavi, N.N.MowlaviNicolas, C.C.NicolasNienartowicz, K.K.NienartowiczPailler, F.F.PaillerPanuzzo, P.P.PanuzzoRiclet, F.F.RicletRoux, W.W.RouxSarro, L. M.L. M.SarroSeabroke, G. M.G. M.SeabrokeSORDO, ROSANNAROSANNASORDOTanga, P.P.TangaThévenin, F.F.ThéveninGracia-Abril, G.G.Gracia-AbrilPortell, J.J.PortellTeyssier, D.D.TeyssierAltmann, M.M.AltmannAndrae, R.R.AndraeBellas-Velidis, I.I.Bellas-VelidisSiopis, C.C.SiopisBenson, K.K.BensonBerthier, J.J.BerthierBlomme, R.R.BlommeBrugaletta, ElisaElisaBrugalettaBurgess, P. W.P. W.BurgessBusso, G.G.BussoCarry, B.B.CarryCELLINO, AlbertoAlbertoCELLINOCheek, N.N.CheekCLEMENTINI, GisellaGisellaCLEMENTINISmith, M.M.SmithDamerdji, Y.Y.DamerdjiDavidson, M.M.DavidsonDelchambre, L.L.DelchambreDELL'ORO, AldoAldoDELL'OROFernández-Hernández, J.J.Fernández-HernándezGalluccio, L.L.GalluccioGarcía-Lario, P.P.García-LarioGarcia-Reinaldos, M.M.Garcia-ReinaldosGonzález-Núñez, J.J.González-NúñezGosset, E.E.GossetSOZZETTI, AlessandroAlessandroSOZZETTIHaigron, R.R.HaigronHalbwachs, J. -L.J. -L.HalbwachsHambly, N. C.N. C.HamblyHarrison, D. L.D. L.HarrisonHatzidimitriou, D.D.HatzidimitriouHeiter, U.U.HeiterHestroffer, D.D.HestrofferUlla, A.A.UllaGeyer, R.R.GeyerUtrilla, E.E.Utrillavan Leeuwen, M.M.van Leeuwenvan Reeven, W.W.van ReevenABBAS, UmmiUmmiABBASAbreu Aramburu, A.A.Abreu AramburuAccart, S.S.AccartAerts, C.C.AertsAguado, J. J.J. J.AguadoAjaj, M.M.AjajALTAVILLA, GIUSEPPEGIUSEPPEALTAVILLAHilger, T.T.HilgerÁlvarez, M. A.M. A.ÁlvarezÁlvarez Cid-Fuentes, J.J.Álvarez Cid-FuentesAlves, J.J.AlvesAnderson, R. I.R. I.AndersonAnglada Varela, E.E.Anglada VarelaAntoja, T.T.AntojaAudard, M.M.AudardBaines, D.D.BainesBaker, S. G.S. G.BakerBalaguer-Nú\-nez, L.L.Balaguer-Nú\-nezLammers, U.U.LammersBalbinot, E.E.BalbinotBalog, Z.Z.BalogBarache, C.C.BaracheBarbato, D.D.BarbatoBarros, M.M.BarrosBarstow, M. A.M. A.BarstowBartolomé, S.S.BartoloméBassilana, J. -L.J. -L.BassilanaBauchet, N.N.BauchetBaudesson-Stella, A.A.Baudesson-StellaSteidelmüller, H.H.SteidelmüllerBECCIANI, UgoUgoBECCIANIBELLAZZINI, MicheleMicheleBELLAZZINIBernet, M.M.BernetBERTONE, StefanoStefanoBERTONEBianchi, L.L.BianchiBlanco-Cuaresma, S.S.Blanco-CuaresmaBoch, T.T.BochBossini, D.D.BossiniBouquillon, S.S.BouquillonBramante, L.L.BramanteStephenson, C. A.C. A.StephensonBreedt, E.E.BreedtBressan, A.A.BressanBrouillet, N.N.BrouilletBUCCIARELLI, BeatriceBeatriceBUCCIARELLIBurlacu, A.A.BurlacuBUSONERO, DeborahDeborahBUSONEROButkevich, A. G.A. G.ButkevichBUZZI, RAFFAELLARAFFAELLABUZZICaffau, E.E.CaffauCancelliere, R.R.CancelliereBrown, A. G. A.A. G. A.BrownCánovas, H.H.Cánovas2021-01-222021-01-2220210004-6361http://hdl.handle.net/20.500.12386/29942Context. 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 system barycentre 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. The effect of the acceleration is 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 are tried and compared to get the most consistent result and a realistic estimate of its uncertainty. Additional tests with the Gaia astrometric solution are used to get a better idea on possible systematic errors in the estimate. Results. Our best estimate of the acceleration based on Gaia EDR3 is $(2.32 \pm 0.16) \times 10^{-10}$ m s${}^{-2}$ (or $7.33 \pm 0.51$ km s$^{-1}$ Myr${}^{-1}$) towards $\alpha = 269.1^\circ \pm 5.4^\circ$, $\delta = -31.6^\circ \pm 4.1^\circ$, corresponding to a proper motion amplitude of $5.05 \pm 0.35$ $\mu$as 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 $\mu$as yr${}^{-1}$.STAMPAenArticle10.1051/0004-6361/202039734https://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/2020397342020arXiv201202036GFIS/05 - ASTRONOMIA E ASTROFISICA