Ultra-Compact Dwarf Galaxies More Massive than Allowed?

Details Ultra-Compact Dwarf Galaxies More Massive than Allowed? Ultra-Compact Dwarf Galaxies More Massive than Allowed?

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..246..427h&link_type=abstract

Dynamical Evolution of Dense Stellar Systems, Proceedings of the International Astronomical Union, IAU Symposium, Volume 246, p.

Astronomy and Astrophysics

Astronomy

1

Galaxies: Star Clusters, Galaxies: Dwarf, Galaxies: Kinematics And Dynamics

Scientific paper

Dynamical mass estimates of ultra-compact dwarfs galaxies and massive globular clusters in the Fornax and Virgo clusters and around the giant elliptical Cen A have revealed some surprising results: 1) above ~106 M the mass-to-light (M/L) ratio increases with the objects' mass; 2) some UCDs/massive GCs show high M/L values (4 to 6) that are not compatible with standard stellar population models; and 3) in the luminosity-velocity dispersion diagram, UCDs deviate from the well-defined relation of “normal” GCs, being more in line with the Faber-Jackson relation of early-type galaxies. In this contribution, we present the observational evidences for high mass-to-light ratios of UCDs and discuss possible explanations for them.

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