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Testing MOND with globular clusters

Published online by Cambridge University Press:  19 May 2006

G.A. Mamon ,
F. Combes ,
C. Deffayet ,
B. Fort  and
H. Baumgardt
H. Baumgardt*
Affiliation:
Sternwarte, University of Bonn, 53121 Bonn, Germany
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Abstract

We propose to determine the stellar velocity dispersions of globular clustersin the outer halo of the Milky Way in order to decide whetherthe dynamics of the universe on large scales is governed by dark matteror modified Newtonian dynamics (MOND). We show that for a number ofGalactic globular clusters, both the internal and the external accelerationsare significantly below the critical acceleration parameter a0 of MOND.This leads to velocity dispersions in case of MOND which exceed their Newtonian counterpartsby up to a factor of 3, providing a stringent test for MOND.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 20: Mass Profiles and Shapes of Cosmological Structures , 2006 , pp. 265 - 266
Copyright
© EAS, EDP Sciences, 2006

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