Internal Dynamics of the Most Luminous Fornax Cluster UCD

Details Internal Dynamics of the Most Luminous Fornax Cluster UCD Internal Dynamics of the Most Luminous Fornax Cluster UCD

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011eas....48..265f&link_type=abstract

EAS Publications Series, Volume 48, 2011, pp.265-267

Computer Science

Scientific paper

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.

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