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Suveges, M, Szabados, L, Szegedi-Elek, E, Taris, F, Tauran, G, Taylor, MB, Teixeira, R, Thuillot, W, Tonello, N, Torra, F, Torra, J, Turon, C, Unger, N, Vaillant, M, van Dillen, E, Vanel, O, Vecchiato, A, Viala, Y, Vicente, D, Voutsinas, S, Weiler, M, Wevers, T, Wyrzykowski, L, Yoldas, A, Yvard, P, Zhao, H, Zorec, J, Zucker, S, Zurbach, C and Zwitter, T (2021) Gaia Early Data Release 3 Acceleration of the Solar System from Gaia astrometry. Astronomy & Astrophysics, 649. ISSN 1432-0746

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	astrometry; Astronomy & Astrophysics; BAR; DISTANCE; Galaxy; GALAXY; KINEMATICS; kinematics and dynamics; LARGE-MAGELLANIC-CLOUD; MASS; methods: data analysis; MILKY-WAY; PERTURBATION; Physical Sciences; PROPER MOTION; proper motions; reference systems; Science & Technology; VIRGO CLUSTER; Science & Technology; Physical Sciences; Astronomy & Astrophysics; astrometry; proper motions; reference systems; Galaxy; kinematics and dynamics; methods: data analysis; LARGE-MAGELLANIC-CLOUD; PROPER MOTION; VIRGO CLUSTER; MILKY-WAY; MASS; DISTANCE; GALAXY; BAR; PERTURBATION; KINEMATICS; Astronomy & Astrophysics; 0201 Astronomical and Space Sciences
Subjects:	Q Science > QB Astronomy
Divisions:	Astrophysics Research Institute
Publisher:	EDP Sciences
SWORD Depositor:	A Symplectic
Date Deposited:	17 Oct 2022 09:57
Last Modified:	17 Oct 2022 09:57
DOI or ID number:	10.1051/0004-6361/202039734
URI:	https://researchonline.ljmu.ac.uk/id/eprint/17847

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