000005532 001__ 5532
000005532 005__ 20220104115653.0
000005532 0247_ $$2DOI$$a10.1051/0004-6361/202039734
000005532 037__ $$aSCART-2022-0003
000005532 100__ $$aGaia Collaboration
000005532 245__ $$aGaia Early Data Release 3. Acceleration of the Solar System from Gaia astrometry 
000005532 260__ $$c2021
000005532 520__ $$a Context. Gaia Early Data Release 3 (Gaia EDR3) provides accurate astrometry for about 1.6 million compact (QSO-like) extragalactic sources, 1.2 million of which have the best-quality five-parameter astrometric solutions. Aims: The proper motions of QSO-like sources are used to reveal a systematic pattern due to the acceleration of the solar systembarycentre with respect to the rest frame of the Universe. Apart from being an important scientific result by itself, the acceleration measured in this way is a good quality indicator of the Gaia astrometric solution. Methods: Theeffect of the acceleration was obtained as a part of the general expansion of the vector field of proper motions in vector spherical harmonics (VSH). Various versions of the VSH fit and various subsets of the sources were tried and compared to get the most consistent result and a realistic estimate of its uncertainty. Additional tests with the Gaia astrometric solution were used to get a better idea of the possible systematic errors in the estimate. Results: Our best estimate of the acceleration based on Gaia EDR3 is (2.32 ± 0.16) × 10−10 m s−2 (or 7.33 ±0.51 km s−1 Myr−1) towards α = 269.1° ± 5.4°, δ = −31.6° ± 4.1°, corresponding to a proper motion amplitude of 5.05 ±0.35 μas yr−1. This is in good agreement with the acceleration expected from current models of the Galactic gravitational potential. We expect that future Gaia data releases will provide estimates of the acceleration with uncertainties substantially below 0.1 μas yr−1. Movie is only available at https://www.aanda.org
000005532 536__ $$aGaia-Prodex/$$cGaia-Prodex/$$fGaia-Prodex
000005532 594__ $$aNO
000005532 6531_ $$aastrometry
000005532 6531_ $$aproper motions
000005532 6531_ $$areference systems
000005532 6531_ $$aGalaxy: kinematics and dynamics
000005532 6531_ $$amethods: data analysis
000005532 6531_ $$aAstrophysics - Astrophysics of Galaxies 
000005532 700__ $$aKlioner, S. A.
000005532 700__ $$aMignard, F.
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000005532 700__ $$aGeyer, R.
000005532 700__ $$aHilger, T.
000005532 700__ $$aLammers, U.
000005532 700__ $$aSteidelmüller, H.
000005532 700__ $$aStephenson, C. A.
000005532 700__ $$aBrown, A. G. A.
000005532 700__ $$aVallenari, A.
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000005532 700__ $$aCreevey, O. L.
000005532 700__ $$aEvans, D. W.
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000005532 700__ $$aDafonte, C.
000005532 700__ $$aDapergolas, A.
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000005532 700__ $$aDi Matteo, P.
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000005532 773__ $$cA9$$pAstronomy & Astrophysics$$v649$$y2021
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