Gaia Early Data Release 3 Acceleration of the Solar System from Gaia astrometry
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Gaia Early Data Release 3 Acceleration of the Solar System from Gaia astrometry. / Klioner, S. A.; Mignard, F.; Lindegren, L.; Bastian, U.; McMillan, P. J.; Hernandez, J.; Hobbs, D.; Ramos-Lerate, M.; Biermann, M.; Bombrun, A.; de Torres, A.; Gerlach, E.; Hilger, T.; Lammers, U.; Steidelmueller, H.; Stephenson, C. A.; Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; Babusiaux, C.; Creevey, O. L.; Evans, D. W.; Eyer, L.; Hutton, A.; Jansen, F.; Jordi, C.; Luri, X.; Panem, C.; Pourbaix, D.; Randich, S.; Sartoretti, P.; Soubiran, C.; Walton, N. A.; Arenou, F.; Bailer-Jones, C. A. L.; Cropper, M.; Drimmel, R.; Katz, D.; Lattanzi, M. G.; Fabricius, C.; Smith, M.; Anderson, R. I.; Hauser, M.; Lindstrom, H. E. P.; Morris, D.; Pagani, C.; Siebert, A.; Zhao, H.; Gaia Collaboration.
In: Astronomy & Astrophysics, Vol. 649, A9, 28.04.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Gaia Early Data Release 3 Acceleration of the Solar System from Gaia astrometry
AU - Klioner, S. A.
AU - Mignard, F.
AU - Lindegren, L.
AU - Bastian, U.
AU - McMillan, P. J.
AU - Hernandez, J.
AU - Hobbs, D.
AU - Ramos-Lerate, M.
AU - Biermann, M.
AU - Bombrun, A.
AU - de Torres, A.
AU - Gerlach, E.
AU - Hilger, T.
AU - Lammers, U.
AU - Steidelmueller, H.
AU - Stephenson, C. A.
AU - Brown, A. G. A.
AU - Vallenari, A.
AU - Prusti, T.
AU - de Bruijne, J. H. J.
AU - Babusiaux, C.
AU - Creevey, O. L.
AU - Evans, D. W.
AU - Eyer, L.
AU - Hutton, A.
AU - Jansen, F.
AU - Jordi, C.
AU - Luri, X.
AU - Panem, C.
AU - Pourbaix, D.
AU - Randich, S.
AU - Sartoretti, P.
AU - Soubiran, C.
AU - Walton, N. A.
AU - Arenou, F.
AU - Bailer-Jones, C. A. L.
AU - Cropper, M.
AU - Drimmel, R.
AU - Katz, D.
AU - Lattanzi, M. G.
AU - Fabricius, C.
AU - Smith, M.
AU - Anderson, R. I.
AU - Hauser, M.
AU - Lindstrom, H. E. P.
AU - Morris, D.
AU - Pagani, C.
AU - Siebert, A.
AU - Zhao, H.
AU - Gaia Collaboration
PY - 2021/4/28
Y1 - 2021/4/28
N2 - 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) x 10(-10) m s(-2) (or 7.33 +/- 0.51 km s(-1) Myr-1) towards alpha = 269.1 degrees +/- 5.4 degrees, delta = -31.6 degrees +/- 4.1 degrees, corresponding to a proper motion amplitude of 5.05 +/- 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).
AB - 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) x 10(-10) m s(-2) (or 7.33 +/- 0.51 km s(-1) Myr-1) towards alpha = 269.1 degrees +/- 5.4 degrees, delta = -31.6 degrees +/- 4.1 degrees, corresponding to a proper motion amplitude of 5.05 +/- 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).
KW - astrometry
KW - proper motions
KW - reference systems
KW - Galaxy
KW - kinematics and dynamics
KW - methods: data analysis
KW - LARGE-MAGELLANIC-CLOUD
KW - PROPER MOTION
KW - VIRGO CLUSTER
KW - MILKY-WAY
KW - MASS
KW - DISTANCE
KW - GALAXY
KW - BAR
KW - PERTURBATION
KW - KINEMATICS
U2 - 10.1051/0004-6361/202039734
DO - 10.1051/0004-6361/202039734
M3 - Journal article
VL - 649
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
M1 - A9
ER -
ID: 270620262