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Gaia Early Data Release 3: Acceleration of the Solar System from Gaia astrometry
Lohrmann Observatory, Technische Universität Dresden, Mommsenstraße 13, 01062 Dresden, Germany.
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, Bd de l’Observatoire, CS 34229, 06304 Nice Cedex 4, France.
Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, Box 43, 22100 Lund, Sweden.
Astronomisches Rechen-Institut, Zentrum fôr Astronomie der Universität Heidelberg, Mönchhofstr. 12-14, 69120 Heidelberg, Germany.
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2021 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 649, article id A9Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
EDP Sciences, 2021. Vol. 649, article id A9
Keywords [en]
astrometry, proper motions, reference systems, Galaxy: kinematics and dynamics, methods: data analysis
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Onboard Space Systems
Identifiers
URN: urn:nbn:se:ltu:diva-84270DOI: 10.1051/0004-6361/202039734ISI: 000645222500005Scopus ID: 2-s2.0-85104986773OAI: oai:DiVA.org:ltu-84270DiVA, id: diva2:1554615
Note

Validerad;2021;Nivå 2;2021-05-17 (alebob);

Finansiär: För finansiärsinformation se Acknowledgements https://www.aanda.org/articles/aa/full_html/2021/05/aa39734-20/aa39734-20.html

Available from: 2021-05-17 Created: 2021-05-17 Last updated: 2025-03-21Bibliographically approved

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Granvik, Mikael

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