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2018MNRAS.473..419B - Mon. Not. R. Astron. Soc., 473, 419-430 (2018/January-1)

The escape velocity curve of the Milky Way in modified Newtonian dynamics.


Abstract (from CDS):

We determine the escape velocity from the Milky Way (MW) at a range of Galactocentric radii in the context of modified Newtonian dynamics (MOND). Due to its non-linear nature, escape is possible if the MW is considered embedded in a constant external gravitational field (EF) from distant objects. We model this situation using a fully self-consistent method based on a direct solution of the governing equations out to several thousand disc scalelengths. We try out a range of EF strengths and mass models for the MW in an attempt to match the escape velocity measurements of Williams et al. (2017). A reasonable match is found if the EF on the MW is ∼0.03 a0_, towards the higher end of the range considered. Our models include a hot gas corona surrounding the MW, but our results suggest that this should have a very low mass of ∼2 x 1010 M to avoid pushing the escape velocity too high. Our analysis favours a slightly lower baryonic disc mass than the ∼7 x 1010 M required to explain its rotation curve in MOND. However, given the uncertainties, MOND is consistent with both the locally measured amplitude of the MW rotation curve and its escape velocity over Galactocentric distances of 8-50 kpc.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): gravitation - stars: kinematics and dynamics - Galaxy: disc - Galaxy: fundamental parameters - Galaxy: kinematics and dynamics - large-scale structure of Universe - large-scale structure of Universe

Errata: erratum vol. 478, p. 3878 (2018)

Simbad objects: 6

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