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Using Globular Clusters to Test Newton's Law of Gravity

Published online by Cambridge University Press:  26 May 2016

Riccardo Scarpa ,
Gianni Marconi  and
Roberto Gilmozzi
Riccardo Scarpa
Affiliation:
European Southern Observatory, Santiago, Chile
Gianni Marconi
Affiliation:
European Southern Observatory, Santiago, Chile
Roberto Gilmozzi
Affiliation:
European Southern Observatory, Santiago, Chile

Abstract

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New measurements of the velocity dispersion of the globular cluster ω Centauri allow us to trace its gravitational potential down to an acceleration of 8 × 10–9 cm s–2. It is found that the dispersion profile remains flat well inside the tidal radius as soon as the acceleration of gravity approaches a0, a result that finds its simplest explanation within the context of MOND. A similar behaviour is observed in the globular cluster M15 showing this is not a peculiar feature of ω Centauri. This result is surprising and suggestive of a failure of Newton's law at low accelerations.

Type
Part 6: The Galaxy
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 215 - 216
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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