Escaping from MOND

Abstract

We present a new test of modified Newtonian dynamics (MOND) on galactic scales, based on the escape speed in the solar neighbourhood. This test is independent from other empirical successes of MOND at reproducing the phenomenology of galactic rotation curves. The galactic escape speed in MOND is entirely determined by the baryonic content of the Galaxy and the external field in which it is embedded. We estimate that the external field in which the Milky Way must be embedded to produce the observed local escape speed of 550 km/s is of the order of a_0/100, where a_0 is the dividing acceleration scale below which gravity is boosted in MOND. This is compatible with the external gravitational field actually acting on the Milky Way.

4 pages, 1 figure; accepted for publication in MNRAS

References in corpus (3)

• NGC 3741: dark halo profile from the most extended rotation curve
• On the Proof of Dark Matter, the Law of Gravity and the Mass of Neutrinos
• Insight into the baryon-gravity relation in galaxies

Cited by in corpus (7)

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• Testing gravity with motion of satellites around galaxies: Newtonian gravity against Modified Newtonian Dynamics
• An analytic model for non-spherical lenses in covariant MOdified Newtonian Dynamics
• Self-consistent models of triaxial galaxies in MOND gravity
• Is Gravitational Lensing by Intercluster Filaments Always Negligible?
• On the MOND External Field Effect in the Solar System
• Can MONDian vector theories explain the cosmic speed up ?