NGC 5128's Globular Cluster System: Is There a Dark Side?. Issue Volume 10:Issue S309(2014) (9th February 2015)

• Record Type: Journal Article
• Authors: Taylor, Matthew; Puzia, Thomas; Gomez, Matias; Woodley, Kristin
• Editors: Ziegler, Bodo L.; Combes, Françoise; Dannerbauer, Helmut; Verdugo, Miguel
• Is Part Of: Proceedings of the International Astronomical Union. Volume 10:Issue S309(2014)
• Page Start: 348
• Page End: 348
• Publication Date: 2015-02-09
• Subjects: galaxies:individual:NGC 5128, -- galaxies:globular clusters:general; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921314010394
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: 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.