Dissipationless collapses in MOND

Abstract

Dissipationless collapses in Modified Newtonian Dynamics (MOND) are studied by using a new particle-mesh N-body code based on our numerical MOND potential solver. We found that low surface-density end-products have shallower inner density profile, flatter radial velocity-dispersion profile, and more radially anisotropic orbital distribution than high surface-density end-products. The projected density profiles of the final virialized systems are well described by Sersic profiles with index m~4, down to m~2 for a deep-MOND collapse. Consistently with observations of elliptical galaxies, the MOND end-products, if interpreted in the context of Newtonian gravity, would appear to have little or no dark matter within the effective radius. However, we found impossible (under the assumption of constant mass-to-light ratio) to simultaneously place the resulting systems on the observed Kormendy, Faber-Jackson and Fundamental Plane relations of elliptical galaxies. Finally, the simulations provide strong evidence that phase mixing is less effective in MOND than in Newtonian gravity.

15 pages, 6 figures, Accepted for publication in ApJ

References in corpus (5)

• Refining MOND interpolating function and TeVeS Lagrangian
• The importance of dry and wet merging on the formation and evolution of elliptical galaxies
• On Kinematic Substructure in the Sextans Dwarf Spheroidal Galaxy
• Axisymmetric and triaxial MOND density-potential pairs
• Dissipationless collapse, weak homology and central cores of elliptical galaxies

Cited by in corpus (46)

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• The globular cluster NGC 2419: a crucible for theories of gravity
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• Dynamical friction in modified Newtonian dynamics
• Star formation triggered by galaxy interactions in modified gravity
• Vertical dynamics of disk galaxies in MOND
• Galaxy merging in MOND
• The Universal Faber-Jackson Relation
• The collision velocity of the bullet cluster in conventional and modified dynamics
• Relativistic MOND as an alternative to the dark matter paradigm
• 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
• Stellar streams as gravitational experiments I. The case of Sagittarius
• Globular clusters in modified Newtonian dynamics: velocity-dispersion profiles from self-consistent models
• The velocity distribution of SDSS satellites in MOND
• The formation of early-type galaxies through monolithic collapse of gas clouds in Milgromian gravity
• N-body simulations of the Carina dSph in MOND
• Distant star clusters of the Milky Way in MOND
• Radial-orbit instability in modified Newtonian dynamics
• The dynamical phase transitions of stellar systems and the corresponding kinetimacs
• N-body simulations for testing the stability of triaxial galaxies in MOND
• Gaussian random field power spectrum and the Sérsic law
• Relaxation of N-body systems with additive r^-α interparticle forces
• Spherical Collapse in Modified Newtonian Dynamics (MOND)
• Self-consistent models of triaxial galaxies in MOND gravity
• On the separation between baryonic and dark matter: evidence for phantom dark matter?
• Galaxy Bulges As Tests of CDM vs MOND in Strong Gravity
• Dwarf Galaxies, MOND, and Relativistic Gravitation
• Separable triaxial potential-density pairs in MOND
• Relaxation of spherical systems with long-range interactions: a numerical investigation
• The MOND External Field Effect on the Dynamics of the Globular Clusters: General Considerations and Application to NGC 2419
• Radially anisotropic systems with $r^{-\alpha }$ forces. II: radial-orbit instability
• The formation of compact massive relic galaxies in MOND
• Radially anisotropic systems with $r^{-\alpha }$ forces: equilibrium states
• 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)
• Gas expulsion in MOND: the possible origin of diffuse globular clusters and ultra-faint dwarf galaxies
• On the problem of deformed spherical systems in Modified Newtonian Dynamics
• The kinematics of star clusters undergoing gas expulsion in Newtonian and Milgromian dynamics
• Chaos in violent relaxation dynamics. Disentangling micro- and macro-chaos in numerical experiments of dissipationless collapse
• Fast particle-mesh code for Milgromian dynamics
• N-body simulations in modified Newtonian dynamics