Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf...49f&link_type=abstract
SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
With the advent of Gaia, it will be possible to design tests of gravity on the scale of the Galaxy. Observations of external galaxies indeed suggest a one-to-one analytic relation between gravity at any radius and the enclosed baryonic mass, a relation summarized by Milgrom's law of modified Newtonian dynamics (MOND). Within its modified gravity interpretation, MOND makes very specific predictions allowing to differentiate it from a spherical halo of dark matter. Here, we show that MOND can be tested with Gaia by measuring dynamically the disk surface density at the solar radius, the radial mass gradient within the disk, or the velocity ellipsoid tilt angle above the Galactic plane at various heights and various Galactocentric radii. However, these tests require an extremely accurate baryonic mass model for the Milky Way.
Bienayme Olivier
Famaey Benoit
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