Dynamical friction in modified Newtonian dynamics

Abstract

We have tested a previous analytical estimate of the dynamical friction timescale in Modified Newtonian Dynamics (MOND) with fully non-linear N-body simulations. The simulations confirm that the dynamical friction timescale is significantly shorter in MOND than in equivalent Newtonian systems, i.e. systems with the same phase-space distribution of baryons and additional dark matter. An apparent conflict between this result and the long timescales determined for bars to slow and mergers to be completed in previous N-body simulations of MOND systems is explained. The confirmation of the short dynamical-friction timescale in MOND underlines the challenge that the Fornax dwarf spheroidal poses to the viability of MOND.

Accepted for publication in MNRAS. 6 pages, 3 figures. Corrected typo in eq. (8), added panel to Fig. 1, added references and discussion. Results unchanged

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Cited by in corpus (51)

• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• Quasi-linear formulation of MOND
• Local-Group tests of dark-matter Concordance Cosmology: Towards a new paradigm for structure formation
• All-Sky Dynamical Response of the Galactic Halo to the Large Magellanic Cloud
• The globular cluster NGC 2419: a crucible for theories of gravity
• Milky Way potentials in CDM and MOND. Is the Large Magellanic Cloud on a bound orbit?
• MOND simulation suggests the origin of some peculiarities in the Local Group
• The effect of the deforming dark matter haloes of the Milky Way and the Large Magellanic Cloud on the Orphan-Chenab stream
• Star formation triggered by galaxy interactions in modified gravity
• MOND vs. dark matter in light of historical parallels
• RAyMOND: An N-body and hydrodynamics code for MOND
• Testing fundamental physics with distant star clusters: theoretical models for pressure-supported stellar systems
• Resolving the timing problem of the globular clusters orbiting the Fornax dwarf galaxy
• Stellar streams as gravitational experiments I. The case of Sagittarius
• Observing dynamical friction in galaxy clusters
• Polytropic model fits to the globular cluster NGC 2419 in Modified Newtonian Dynamics
• Dark Fluid: Towards a unification of empirical theories of galaxy rotation, Inflation and Dark Energy
• Understanding local Dwarf Spheroidals and their scaling relations under MOdified Newtonian Dynamics
• Globular clusters in modified Newtonian dynamics: velocity-dispersion profiles from self-consistent models
• Modified Kepler's Law, Escape Speed and Two-body Problem in MOND-like Theories
• The Phantom of RAMSES user guide for galaxy simulations using Milgromian and Newtonian gravity
• Dynamical friction in multi-component evolving globular clusters
• Radial-orbit instability in modified Newtonian dynamics
• Bulge formation in disk galaxies with MOND
• The dynamical phase transitions of stellar systems and the corresponding kinetimacs
• Study of gravitational fields and globular cluster systems of early-type galaxies
• Consequences of the external field effect for MOND disk galaxies in galaxy clusters
• Galactic orbital motions in the Dark Matter, MOdified Newtonian Dynamics and MOdified Gravity scenarios
• Globular clusters as probes of dark matter cusp-core transformations
• Chandrasekhar's Dynamical Friction and non-extensive statistics
• Gaseous drag on a gravitational perturber in Modified Newtonian Dynamics and the structure of the wake
• The Challenge to MOND from ultra faint dwarf galaxies
• The tightening of wide binaries in dSph galaxies through dynamical friction as a test of the Dark Matter hypothesis
• Galaxy Bulges As Tests of CDM vs MOND in Strong Gravity
• Imprint of the galactic acceleration scale on globular cluster systems
• The survival of dynamical fossils in dwarf spheroidal galaxies in conventional and modified dynamics
• Radially anisotropic systems with $r^{-\alpha }$ forces: equilibrium states
• Explaining the formation of bulges with MOND
• Relativistic dynamical friction in stellar systems
• Gas expulsion in MOND: the possible origin of diffuse globular clusters and ultra-faint dwarf galaxies
• Type I shell galaxies as a test of gravity models
• Dynamical friction in the quasi-linear formulation of modified Newtonian dynamics (QuMOND)
• On the problem of deformed spherical systems in Modified Newtonian Dynamics
• Globular cluster orbital decay in dwarf galaxies with MOND and CDM: Impact of supernova feedback
• The kinematics of star clusters undergoing gas expulsion in Newtonian and Milgromian dynamics
• The Atacama Cosmology Telescope: A Test of the Gravitational Force Law on Cosmological Scales Using the Kinematic Sunyaev-Zeldovich Effect
• Evolution of globular-cluster systems of ultra-diffuse galaxies due to dynamical friction in MOND gravity
• Testing QUMOND theory with Galactic globular clusters in a weak external field
• Comparison of HMG and flat rotation velocities inferred from galaxy-galaxy weak lensing
• N-body simulations in modified Newtonian dynamics
• Are disks of satellites comprised of tidal dwarf galaxies?