@booklet {23768,
	title = {Gaia Early Data Release 3: Acceleration of the solar system from Gaia astrometry},
	year = {2020},
	month = {2020/12/1},
	pages = {arXiv:2012.02036},
	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 system barycentre 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. The effect of the acceleration is 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 are tried and compared to get the most consistent result and a realistic estimate of its uncertainty. Additional tests with the Gaia astrometric solution are used to get a better idea on possible systematic errors in the estimate. Results. Our best estimate of the acceleration based on Gaia EDR3 is $(2.32 \pm 0.16) \times 10^{-10}$ m s${}^{-2}$ (or $7.33 \pm 0.51$ km s$^{-1}$ Myr${}^{-1}$) towards $\alpha = 269.1^\circ \pm 5.4^\circ$, $\delta = -31.6^\circ \pm 4.1^\circ$, corresponding to a proper motion amplitude of $5.05 \pm 0.35$ $\mu$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${}^{-1}$.},
	keywords = {Astrophysics - Astrophysics of Galaxies},
	url = {https://ui.adsabs.harvard.edu/abs/2020arXiv201202036G},
	author = {Gaia Collaboration and Klioner, S. A. and Mignard, F. and Lindegren, L. and Bastian, U. and McMillan, P. J. and Hern{\'a}ndez, J. and Hobbs, D. and Ramos-Lerate, M. and Biermann, M. and Bombrun, A. and de Torres, A. and Gerlach, E. and Geyer, R. and Hilger, T. and Lammers, U. and Steidelm{\"u}ller, H. and Stephenson, C. A. and Brown, A. G. A. and Vallenari, A. and Prusti, T. and de Bruijne, J. H. J. and Babusiaux, C. and Creevey, O. L. and Evans, D. W. and Eyer, L. and Hutton, A. and Jansen, F. and Jordi, C. and Luri, X. and Panem, C. and Pourbaix, D. and Randich, S. and Sartoretti, P. and Soubiran, C. and Walton, N. A. and Arenou, F. and Bailer-Jones, C. A. L. and Cropper, M. and Drimmel, R. and Katz, D. and Lattanzi, M. G. and van Leeuwen, F. and Bakker, J and Casta{\~n}eda, J. and De Angeli, F. and Ducourant, C. and Fabricius, C. and Fouesneau, M. and Fr{\'e}mat, Y. and Guerra, R. and Guerrier, A. and Guiraud, J. and Jean-Antoine Piccolo, A. and Masana, E. and Messineo, R. and Mowlavi, N. and Nicolas, C. and Nienartowicz, K. and Pailler, F. and Panuzzo, P. and Riclet, F. and Roux, W. and Seabroke, G. M. and Sordo, R. and Tanga, P. and Th{\'e}venin, F. and Gracia-Abril, G. and Portell, J. and Teyssier, D. and Altmann, M. and Andrae, R. and Bellas-Velidis, I. and Benson, K. and Berthier, J. and Blomme, R. and Brugaletta, E. and Burgess, P. W. and Busso, G. and Carry, B. and Cellino, A. and Cheek, N. and Clementini, G. and Damerdji, Y. and Davidson, M. and Delchambre, L. and Dell{\textquoteright}Oro, A. and Fern{\'a}ndez-Hern{\'a}ndez, J. and Galluccio, L. and Garc{\'\i}a-Lario, P. and Garcia-Reinaldos, M. and Gonz{\'a}lez-N{\'u}{\~n}ez, J. and Gosset, E. and Haigron, R. and Halbwachs, J. -L. and Hambly, N. C. and Harrison, D. L. and Hatzidimitriou, D. and Heiter, U. and Hestroffer, D. and Hodgkin, S. T. and Holl, B. and Jan{\ss}en, K. and Jevardat de Fombelle, G. and Jordan, S. and Krone-Martins, A. and Lanzafame, A. C. and L{\"o}ffler, W. and Lorca, A. and Manteiga, M. and Marchal, O. and Marrese, P. M. and Moitinho, A. and Mora, A. and Muinonen, K. and Osborne, P. and Pancino, E. and Pauwels, T. and Recio-Blanco, A. and Richards, P. J. and Riello, M. and Rimoldini, L. and Robin, A. C. and Roegiers, T. and Rybizki, J. and Sarro, L. 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}
