Using distant globular clusters as a test for gravitational theories

Baumgardt, H., Grebel, E. K. and Kroupa, P. (2005) Using distant globular clusters as a test for gravitational theories. Monthly Notices of the Royal Astronomical Society: Letters, 359 1: L1-L4. doi:10.1111/j.1745-3933.2005.00021.x

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Author Baumgardt, H.
Grebel, E. K.
Kroupa, P.
Title Using distant globular clusters as a test for gravitational theories
Journal name Monthly Notices of the Royal Astronomical Society: Letters   Check publisher's open access policy
ISSN 1745-3925
Publication date 2005-05
Sub-type Article (original research)
DOI 10.1111/j.1745-3933.2005.00021.x
Open Access Status File (Publisher version)
Volume 359
Issue 1
Start page L1
End page L4
Total pages 4
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Formatted abstract
We propose to determine the stellar velocity dispersions of globular clusters in the outer halo of the Milky Way in order to decide whether the dynamics of the Universe on large scales is governed by dark matter or modified Newtonian dynamics (MOND). We show that, for a number of Galactic globular clusters, both the internal and the external accelerations are significantly below the critical acceleration parameter a0 of MOND. This leads to velocity dispersions in the case of MOND which exceed their Newtonian counterparts by up to a factor of 3, providing a stringent test for MOND. Alternatively, in cases where high velocity dispersions are found, these would provide the first evidence that globular clusters are dark matter dominated.
Keyword Globular clusters : general
Dark matter
Modified Newtonian dynamics
Spheroidal satellite galaxies
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 40 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 39 times in Scopus Article | Citations
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