Using Globular Clusters to Test Newton?s Law of Gravityy
Astrophysics
2007-05-23 v1
Abstract
New measurements of the velocity dispersion of the globular cluster omega Centauri allow to trace its gravitational potential down to an acceleration of 8e-9 cm/s/s. It is found that the dispersion profile remains flat well inside the tidal radius as soon as the acceleration of gravity approaches a_0, a result that finds its simplest explanation within the contest of Modified Newtonian dynamics. A similar behavior is observed in the globular cluster M15 showing this is not a peculiar features of omega Centauri. This result is surprising and suggestive of a failure of Newton's law at low accelerations.
Keywords
Cite
@article{arxiv.astro-ph/0308416,
title = {Using Globular Clusters to Test Newton?s Law of Gravityy},
author = {Riccardo Scarpa and Gianni Marconi and Roberto Gilmozzi},
journal= {arXiv preprint arXiv:astro-ph/0308416},
year = {2007}
}
Comments
Presented at the IAU220 symposium: "Dark matter in galaxies". Sydney, August 2003