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NGC 5128's Globular Cluster System: Is There a Dark Side?

Published online by Cambridge University Press:  09 February 2015

Matthew Taylor
Affiliation:
Institute of Astrophysics, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Santiago, Chile email: [email protected]; [email protected]
Thomas Puzia
Affiliation:
Institute of Astrophysics, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Santiago, Chile email: [email protected]; [email protected]
Matias Gomez
Affiliation:
Depto. de Ciencias Fisicas, Universidad Andres Bello, República 220, Santiago, Chile email: [email protected]
Kristin Woodley
Affiliation:
University of California, Santa Cruz, UC Observatories, 1156 High Street, Santa Cruz, USA
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Abstract

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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

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