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Gaia Early Data Release 3. Acceleration of the Solar System from Gaia astrometry

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dc.abstract.enContext. 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<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>. Movie is only available at <A href=https://www.aanda.org/10.1051/0004-6361/202039734/olm>https://www.aanda.org</A>
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dc.date.accessioned2024-01-25T01:58:50Z
dc.date.available2024-01-25T01:58:50Z
dc.date.copyright2020-12-03
dc.date.issued2021
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.versionORIGINAL_AUTHOR
dc.description.volume649
dc.identifier.doi10.1051/0004-6361/202039734
dc.identifier.issn0004-6361
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/107704
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2021A&A...649A...9G
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomy and Astrophysics
dc.relation.pagesA9
dc.rightsOther
dc.sciencecloudnosend
dc.titleGaia Early Data Release 3. Acceleration of the Solar System from Gaia astrometry
dc.typeJournalArticle
dspace.entity.typePublication