MOND and the mass discrepancies in tidal dwarf galaxies

Abstract

I consider in light of MOND the three debris galaxies discussed recently by Bournaud et al.. These exhibit mass discrepancies of a factor of a few within several scale lengths of the visible galaxy, which, arguably, flies in the face of the cold dark matter paradigm. I show here that the rotational velocities predicted by MOND agree well with the observed velocities for each of the three galaxies, with only the observed baryonic matter as the source of gravity. There is thus no need to invoke a new form of baryonic, yet-undetected matter that dominates the disc of spiral galaxies, as advocated by Bournaud et al. I argue on other grounds that the presence of such ubiquitous disc dark matter, in addition to cold dark matter, is not likely.

9 pages, 1 figure. Changed to agree with the version to be published in Astrophys. J. Lett

References in corpus (5)

• NGC 3741: dark halo profile from the most extended rotation curve
• Tidal dwarf galaxies as a test of fundamental physics
• The modified Newtonian dynamics-MOND-and its implications for new physics
• Loss of mass and stability of galaxies in MOND
• MOND rotation curves of very low mass spiral galaxies

Cited by in corpus (12)

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• The collision velocity of the bullet cluster in conventional and modified dynamics
• Marriage à-la-MOND: Baryonic dark matter in galaxy clusters and the cooling flow puzzle
• Reconciling MOND and dark matter?
• An analytic model for non-spherical lenses in covariant MOdified Newtonian Dynamics
• The velocity distribution of SDSS satellites in MOND
• N-body simulations for testing the stability of triaxial galaxies in MOND
• Is Gravitational Lensing by Intercluster Filaments Always Negligible?
• Tidal Debris posing as Dark Galaxies