Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 379, Issue 2, Pages 597-604Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2007.11835.x
Keywords
gravitation; stellar dynamics; galaxies : kinematics and dynamics
Categories
Funding
- Science and Technology Facilities Council [PP/D000890/1] Funding Source: researchfish
- STFC [PP/D000890/1] Funding Source: UKRI
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We investigate the possibility of discriminating between modified Newtonian dynamics (MOND) and Newtonian gravity with dark matter, by studying the vertical dynamics of disc galaxies. We consider models with the same circular velocity in the equatorial plane (purely baryonic discs in MOND and the same discs 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 find that the vertical velocity dispersion of deep MOND discs can be much larger than in the equivalent spherical Newtonian models. However, in the more realistic case of high surface density discs, this effect is significantly reduced, casting doubt on the possibility of discriminating between MOND and Newtonian gravity with dark matter by using current observations.
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