Loss of mass and stability of galaxies in MOND

Abstract

The self-binding energy and stability of a galaxy in MOND-based gravity are curiously decreasing functions of its center of mass acceleration towards neighbouring mass concentrations. A tentative indication of this breaking of the Strong Equivalence Principle in field galaxies is the RAVE-observed escape speed in the Milky Way. Another consequence is that satellites of field galaxies will move on nearly Keplerian orbits at large radii (100 - 500 kpc), with a declining speed below the asymptotically constant naive MOND prediction. But consequences of an environment-sensitive gravity are even more severe in clusters, where member galaxies accelerate fast: no more Dark-Halo-like potential is present to support galaxies, meaning that extended axisymmetric disks of gas and stars are likely unstable. These predicted reappearance of asymptotic Keplerian velocity curves and disappearance of "stereotypic galaxies" in clusters are falsifiable with targeted surveys.

4 pages, 2 figures, ApJ Letters

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• MOND and the mass discrepancies in tidal dwarf galaxies
• The collision velocity of the bullet cluster in conventional and modified dynamics
• MOND plus classical neutrinos not enough for cluster lensing
• Marriage à-la-MOND: Baryonic dark matter in galaxy clusters and the cooling flow puzzle
• Testing gravity with motion of satellites around galaxies: Newtonian gravity against Modified Newtonian Dynamics
• Probing the radial acceleration relation and the strong equivalence principle with the Coma cluster ultra-diffuse galaxies
• The velocity distribution of SDSS satellites in MOND
• N-body simulations of the Carina dSph in MOND
• Strong lensing probability in TeVeS theory
• N-body simulations for testing the stability of triaxial galaxies in MOND
• Neutrinos as galactic dark matter in the Ursa Major galaxy group?
• Self-consistent models of triaxial galaxies in MOND gravity
• Physics of galactic colliders: high speed satellites in LCDM vs MONDian cosmology
• Lopsidedness of self-consistent galaxies by the external field effect of clusters
• Testing the Newton second law in the regime of small accelerations
• The MOND External Field Effect on the Dynamics of the Globular Clusters: General Considerations and Application to NGC 2419
• Galaxy Bulges As Tests of CDM vs MOND in Strong Gravity
• Testing modified gravity with motion of satellites around galaxies
• Formation of collisional ring galaxies in Milgromian dynamics
• The stability of galaxies in an expanding universe obtained by Newtonian dynamics
• Measuring Mass of Gas in Central Galaxies using weak lensing and satellite kinematics in MOND