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NGC 5128's Globular Cluster System: Is There a Dark Side?
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- Journal:
- Proceedings of the International Astronomical Union / Volume 10 / Issue S309 / July 2014
- Published online by Cambridge University Press:
- 09 February 2015, p. 348
- Print publication:
- July 2014
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- Article
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Dynamical mass estimates (
${\cal M}_{\rm dyn}$) and mass-to-light ratios (
$\Upsilon_{\rm dyn}$) were derived for a sample of NGC 5128's globular clusters (GCs). We find two distinct sequences in the $\Upsilon_{\rm dyn}$ − ${\cal M}_{\rm dyn}$ plane, which are well fit by power laws of the forms 
$\Upsilon_{\rm dyn}\propto {\cal M}_{\rm dyn}^{0.33\pm0.04}$ and 
$\Upsilon_{\rm dyn}\propto {\cal M}_{\rm dyn}^{0.91\pm0.04}$. The former traces bright “classical” GCs, and the latter represents objects that are dynamically dominated by large dark matter components or by abnormally massive central black holes.
