Velocity Dispersion in the Halo of omega Centauri: No need for MOND given the present data

Details Velocity Dispersion in the Halo of omega Centauri: No need for MOND given the present data Velocity Dispersion in the Halo of omega Centauri: No need for MOND given the present data

2003-02-13

arxiv.org/abs/astro-ph/0302257v1

Astronomy and Astrophysics

Astrophysics

2 pages, to appear in New Horizons in Globular Cluster Astronomy, ed. G. Piotto et al

Scientific paper

Scarpa et al. (2003) have used their new measurements of the line-of-sight velocity dispersion at radii R ~ 30-45 pc in omega Centauri to argue for modifications to Newtonian dynamics (MOND) at low accelerations in the outer reaches of this globular cluster. Alternatively, any such evidence could be taken as an indication of the presence of an extended dark-matter halo. We show that the data of Scarpa et al. are in fact consistent with earlier observations by Seitzer and by Meylan et al., which are in turn well described at large radii by simple, self-consistent dynamical models. There is no need to invoke MOND or dark matter to explain the current data.

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