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

References in corpus (8)

• 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
• Confrontation of MOND with the rotation curves of early-type disc galaxies
• Escaping from MOND
• Vertical dynamics of disk galaxies in MOND
• The velocity distribution of SDSS satellites in MOND
• Fundamentalist physics: why Dark Energy is bad for Astronomy
• Constraining TeVeS Gravity as Effective Dark Matter and Dark Energy