Self-consistent models of triaxial galaxies in MOND gravity

Abstract

The Bekenstein-Milgrom gravity theory with a modified Poisson equation is tested here for the existence of triaxial equilibrium solutions. Using the non-negative least square method, we show that self-consistent triaxial galaxies exist for baryonic models with a mild density cusp $\rho \sim \frac{\Sigma }{r}$. Self-consistency is achieved for a wide range of central concentrations, $\Sigma \sim 10-1000{\mathrm{M}}_{\odot }\mathrm{p}{\mathrm{c}}^{-2}$, representing low-to-high surface brightness galaxies. Our results demonstrate for the first time that the orbit superposition technique is fruitful for constructing galaxy models beyond Newtonian gravity, and triaxial cuspy galaxies might exist without the help of Cold dark Matter.

19 pages, 1 table, 7 figures, Accepted for publication in ApJ

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Cited by in corpus (12)

• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• Quasi-linear formulation of MOND
• A New Model for the Milky Way Bar
• Lopsidedness of cluster galaxies in modified gravity
• N-body simulations for testing the stability of triaxial galaxies in MOND
• Offset between dark matter and ordinary matter: evidence from a sample of 38 lensing clusters of galaxies
• Lopsidedness of self-consistent galaxies by the external field effect of clusters
• Galaxy Bulges As Tests of CDM vs MOND in Strong Gravity
• Separable triaxial potential-density pairs in MOND
• Basis function expansions for galactic dynamics: Spherical versus cylindrical coordinates
• Orbit properties of massive prolate galaxies in the Illustris simulation
• On the problem of deformed spherical systems in Modified Newtonian Dynamics