Testing MOND with Ultra-Compact Dwarf Galaxies

Details Testing MOND with Ultra-Compact Dwarf Galaxies Testing MOND with Ultra-Compact Dwarf Galaxies

2005-04-03

arxiv.org/abs/astro-ph/0504051v1

Astronomy and Astrophysics

Astrophysics

Two pages. Submitted for publication to MNRAS

Scientific paper

The properties of the recently discovered Ultra-Compact Dwarf Galaxies (UCDs) show that their internal acceleration of gravity is everywhere above a0, the MOdified Newtonian Dynamics (MOND) constant of gravity. MOND therefore makes the strong prediction that no mass discrepancy should be observed for this class of objects. This is confirmed by the few UCDs for which virial masses were derived. We argue that UCD galaxies represent a suitable test-bench for the theory, in the sense that even a single UCD galaxy showing evidence for dark matter would seriously question the validity of MOND.

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