Journal
ASTRONOMY & ASTROPHYSICS
Volume 649, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202039734
Keywords
astrometry; proper motions; reference systems; Galaxy; kinematics and dynamics; methods: data analysis
Categories
Funding
- Algerian Centre de Recherche en Astronomie, Astrophysique et Geophysique of Bouzareah Observatory
- Austrian Fonds zur Forderung der wissenschaftlichen Forschung (FWF) Hertha Firnberg Programme [T359, P20046, P23737]
- BELgian federal Science Policy Office (BELSPO) through PROgramme de Developpement d'Experiences scientifiques (PRODEX)
- Polish Academy of Sciences -Fonds Wetenschappelijk Onderzoek [VS.091.16N]
- Fonds de la Recherche Scientifique (FNRS)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) -Comite Francais d'Evaluation de la Cooperation Universitaire et Scientifique avec le Bresil (COFECUB)
- National Science Foundation of China (NSFC) [11573054, 11703065]
- China Scholarship Council [201806040200]
- Croatian Science Foundation
- Ecole Polytechnique Federale de Lausanne
- Czech-Republic Ministry of Education, Youth, and Sports [LG 15010]
- Czech Space Office through ESA PECS contract [98058]
- Danish Ministry of Science
- Estonian Ministry of Education and Research [IUT40-1]
- European Commission's Sixth Framework Programme through the European Leadership in Space Astrometry (ELSA) Marie Curie Research Training Network [MRTN-CT-2006-033481]
- European Research Council (ERC) [320360, 647208]
- European Research Council (ERC) through European Union [745617, 670519, 687378, 682115, 695099]
- European Science Foundation (ESF)
- European Space Agency (ESA) through the Plan for European Cooperating States (PECS) programme [C98090, 4000106398/12/NL/KML, 4000115263/15/NL/IB]
- Academy of Finland
- French Centre National d'Etudes Spatiales (CNES)
- Agence Nationale de la Recherche (ANR) [ANR-10-IDEX-0001-02, ANR-15-CE31-0007, ANR-14-CE33-0014-01, ANR-15-CE31-0012-01]
- Centre National de la Recherche Scientifique (CNRS)
- SNO Gaia of the Institut des Sciences de l'Univers (INSU)
- Region de Franche-Comte
- Programme National de Gravitation, References, Astronomie, et Metrologie (GRAM) of CNRS/INSU
- Institut National de Physique (INP)
- Institut National de Physique nucleaire et de Physique des Particules (IN2P3)
- CNES
- German Aerospace Agency(Deutsches Zentrum fur Luft-und Raumfahrt e.V., DLR) [50QG0501, 50QG0601, 50QG0602, 50QG0701, 50QG0901, 50QG1001, 50QG1101, 50QG1401, 50QG1402, 50QG1403, 50QG1404, 50QG1904]
- Hungarian Academy of Sciences through the Lendulet Programme [LP2014-17, LP2018-7]
- Hungarian National Research, Development, and Innovation Office (NKFIH) [KH_18-130405]
- Science Foundation Ireland (SFI) through a Royal Society -SFI University Research Fellowship
- Israel Science Foundation (ISF) [848/16]
- Agenzia Spaziale Italiana (ASI) [I/037/08/0, I/058/10/0, 2014-025-R.0, 2014-025-R.1.2015, 2018-24-HH.0, 2014-049-R.0/1/2, I/008/10/0, 2013/030/I.0, 2013-030-I.0.1-2015, 2016-17-I.0]
- INAF
- Italian Ministry of Education, University, and Research (Ministero dell'Istruzione, dell'Universita e della Ricerca) through the Premiale project `MIning The Cosmos Big Data and Innovative Italian Technology for Frontier Astrophysics and Cosmology' (MITiC)
- Netherlands Organisation for Scientific Research (NWO) through a VICI grant [NWO-M-614.061.414]
- Netherlands Research School for Astronomy (NOVA)
- Polish National Science Centre through HARMONIA grant [2019/30/M/ST9/00311]
- Ministry of Science and Higher Education (MNiSW) [DIR/WK/2018/12]
- Portugese Fundacao para a Ciencia e a Tecnologia (FCT) [SFRH/BPD/74697/2010, SFRH/BD/128840/2017, UID/FIS/00099/2019]
- Slovenian Research Agency [P1-0188]
- Spanish Ministry of Economy (MINECO/FEDER, UE) [ESP2016-80079-C2-1-R, ESP2016-80079-C2-2-R, RTI2018-095076-B-C21, RTI2018-095076-B-C22, BES-2016-078499, BES-2017-083126]
- Juan de la Cierva formacion 2015 grant [FJCI-2015-2671]
- Spanish Ministry of Education, Culture, and Sports [FPU16/03827]
- Spanish Ministry of Science and Innovation (MICINN) [AYA2017-89841P, TIN2015-65316-P]
- Severo Ochoa Centre of Excellence Programme of the Spanish Government [SEV2015-0493]
- Institute of Cosmos Sciences University of Barcelona (ICCUB, Unidad de Excelencia `Maria de Maeztu') [MDM-2014-0369, CEX2019-000918-M]
- University of Barcelona
- Spanish Virtual Observatory [AyA2017-84089]
- Galician Regional Government, Xunta de Galicia [ED431B-2018/42, ED481A-2019/155]
- Centro de Investigacion en Tecnologias de la Informacion y las Comunicaciones (CITIC) - Xunta de Galicia
- Xunta de Galicia
- Centros Singulares de Investigacion de Galicia through CITIC
- European Union through the European Regional Development Fund (ERDF)/Fondo Europeo de Desenvolvemento Rexional (FEDER) [ED431G-2019/01]
- Barcelona Supercomputing Centre -Centro Nacional de Supercomputacion (BSC-CNS) [AECT-2016-1-0006, AECT-2016-2-0013, AECT-2016-3-0011, AECT-2017-1-0020]
- Departament d'Innovacio, Universitats i Empresa de la Generalitat de Catalunya [2014-SGR-1051]
- Ramon y Cajal Fellowship [RYC2018-025968-I]
- Swedish National Space Agency (SNSA/Rymdstyrelsen)
- Swiss State Secretariat for Education, Research, and Innovation through the Mesures d'Accompagnement, the Swiss Activites Nationales Complementaires
- Swiss National Science Foundation
- United Kingdom Particle Physics and Astronomy Research Council (PPARC)
- United Kingdom Science and Technology Facilities Council (STFC)
- United Kingdom Space Agency (UKSA) [PP/D006511/1, PP/D006546/1, PP/D006570/1, ST/I000852/1, ST/J005045/1, ST/K00056X/1, ST/K000209/1, ST/K000756/1, ST/L006561/1, ST/N000595/1, ST/N000641/1, ST/N000978/1, ST/N001117/1, ST/S000089/1, ST/S000976/1, ST/S001123/1, ST/S001948/1, ST/S002103/1, ST/V000969/1]
- project 'Mining the Variable Sky' [TTP-2018-07-1171]
- Croatian-Swiss Research Programme
- Czech-Republic Ministry of Education, Youth, and Sports through INTER-EXCELLENCE grant [LTAUSA18093]
- European Commission's Sixth Framework Programme through Marie Curie project [PIOF-GA-2009-255267]
- European Commission's Sixth Framework Programme through Marie Curie Transfer-of-Knowledge (ToK) fellowship [MTKD-CT-2004-014188]
- European Commission's Seventh Framework Programme [FP7-606740, 264895]
- Magnus Ehrnrooth Foundation
- 'Action Federatrice Gaia' of the Observatoire de Paris
- Hungarian Academy of Sciences through the Premium Postdoctoral Research Programme
- Netherlands Organisation for Scientific Research (NWO)
- Polish National Science Centre through DAINA grant [2017/27/L/ST9/03221]
- Polish National Science Centre through PRELUDIUM grant [2017/25/N/ST9/01253]
- Red Espanola de Supercomputacion (RES) computer resources at MareNostrum
- Agence Nationale de la Recherche (ANR) [ANR-15-CE31-0012, ANR-14-CE33-0014] Funding Source: Agence Nationale de la Recherche (ANR)
- Fundação para a Ciência e a Tecnologia [UID/FIS/00099/2019, SFRH/BD/128840/2017] Funding Source: FCT
Ask authors/readers for more resources
Gaia EDR3 provides accurate astrometry for QSO-like extragalactic sources, allowing for the measurement of the acceleration of the solar system barycentre with respect to the Universe. The estimated acceleration is in good agreement with current models of the Galactic gravitational potential. Future Gaia data releases are expected to provide acceleration estimates with uncertainties below 0.1 mu as yr(-1).
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) x 10(-10) m s(-2) (or 7.33 +/- 0.51 km s(-1) Myr-1) towards alpha = 269.1 degrees +/- 5.4 degrees, delta = -31.6 degrees +/- 4.1 degrees, corresponding to a proper motion amplitude of 5.05 +/- 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).
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