Vertical dynamics of disk galaxies in MOND

Details Vertical dynamics of disk galaxies in MOND Vertical dynamics of disk galaxies in MOND

2007-04-05

arxiv.org/abs/0704.0740v2

Mon.Not.Roy.Astron.Soc.379:597-604,2007

Astronomy and Astrophysics

Astrophysics

8 pages, 7 figures. Accepted for publication in MNRAS. Added reference

Scientific paper

10.1111/j.1365-2966.2007.11835.x

We investigate the possibility of discriminating between Modified Newtonian Dynamics (MOND) and Newtonian gravity with dark matter, by studying the vertical dynamics of disk galaxies. We consider models with the same circular velocity in the equatorial plane (purely baryonic disks in MOND and the same disks in Newtonian gravity embedded in spherical dark matter haloes), and we construct their intrinsic and projected kinematical fields by solving the Jeans equations under the assumption of a two-integral distribution function. We found that the vertical velocity dispersion of deep-MOND disks can be much larger than in the equivalent spherical Newtonian models. However, in the more realistic case of high-surface density disks this effect is significantly reduced, casting doubts on the possibility of discriminating between MOND and Newtonian gravity with dark matter by using current observations.

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