Galaxy merging in MOND

Abstract

We present the results of N-body simulations of dissipationless galaxy merging in Modified Newtonian Dynamics (MOND). For comparison, we also studied Newtonian merging between galaxies embedded in dark matter halos, with internal dynamics equivalent to the MOND systems. We found that the merging timescales are significantly longer in MOND than in Newtonian gravity with dark matter, suggesting that observational evidence of rapid merging could be difficult to explain in MOND. However, when two galaxies eventually merge, the MOND merging end-product is hardly distinguishable from the final stellar distribution of an equivalent Newtonian merger with dark matter.

5 pages, 2 color figures. To appear in MNRAS Letters. Added references and discussion, conclusions unchanged

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• Dwarf Spheroidals in MOND
• Dynamical friction in modified Newtonian dynamics
• The collision velocity of the bullet cluster in conventional and modified dynamics
• RAyMOND: An N-body and hydrodynamics code for MOND
• Forming Galaxies with MOND
• Testing fundamental physics with distant star clusters: theoretical models for pressure-supported stellar systems
• A QUMOND galactic N-body code I: Poisson solver and rotation curve fitting
• Globular clusters in modified Newtonian dynamics: velocity-dispersion profiles from self-consistent models
• The velocity distribution of SDSS satellites in MOND
• Radial-orbit instability in modified Newtonian dynamics
• Bulge formation in disk galaxies with MOND
• Crash-testing the CAULDRON code for joint lensing and dynamics analysis of early-type galaxies
• Study of gravitational fields and globular cluster systems of early-type galaxies
• N-body simulations for testing the stability of triaxial galaxies in MOND
• Relaxation of N-body systems with additive r^-α interparticle forces
• Lopsidedness of self-consistent galaxies by the external field effect of clusters
• On the absence of backsplash analogues to NGC 3109 in the $\Lambda$CDM framework
• Separable triaxial potential-density pairs in MOND
• Imprint of the galactic acceleration scale on globular cluster systems
• Radially anisotropic systems with $r^{-\alpha }$ forces: equilibrium states
• Explaining the formation of bulges with MOND
• Growth of Linear Perturbations in a Universe with Superfluid Dark Matter
• Structure of the equivalent Newtonian systems in MOND N-body simulations. Density profiles and the core-cusp problem
• Dynamical friction in the quasi-linear formulation of modified Newtonian dynamics (QuMOND)
• MOND virial theorem applied to a galaxy cluster
• On the problem of deformed spherical systems in Modified Newtonian Dynamics
• Evolution of globular-cluster systems of ultra-diffuse galaxies due to dynamical friction in MOND gravity
• Formation of collisional ring galaxies in Milgromian dynamics
• Testing QUMOND theory with Galactic globular clusters in a weak external field
• The stability of galaxies in an expanding universe obtained by Newtonian dynamics
• N-body simulations in modified Newtonian dynamics