| Issue |
EAS Publications Series
Volume 48, 2011
CRAL-2010 A Universe of Dwarf Galaxies
|
|
|---|---|---|
| Page(s) | 265 - 267 | |
| Section | Globular Clusters, UCDs, cEs | |
| DOI | https://doi.org/10.1051/eas/1148061 | |
| Published online | 11 July 2011 | |
M. Koleva, Ph. Prugniel and I. Vauglin (eds)
EAS Publications Series, 48 (2011) 265–267
Internal Dynamics of the Most Luminous Fornax Cluster UCD
1 European Southern Observatory, Garching, Germany
2 Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Germany
3 European Southern Observatory, Vitacura, Santiago, Chile
4 School of Mathematics and Physics, University of Queensland, Australia
e-mail: mfrank@eso.org
We present the internal kinematics of UCD3, the brightest known ultra-compact dwarf galaxy (UCD) in the Fornax cluster and the first UCD with spatially resolved spectroscopy. Based on seeing-limited observations with VLT/FLAMES, we measure a velocity field showing the signature of weak rotation and a radial velocity dispersion profile that is flatter than expected from an isotropic Jeans model where mass follows light. We find that both, a strongly anisotropic velocity distribution, and a dark matter component as predicted by simulations of galaxy threshing, can explain the observed flattening.
© EAS, EDP Sciences, 2011