Weighing Ultracompact Dwarf Galaxies in the Fornax Cluster

Details Weighing Ultracompact Dwarf Galaxies in the Fornax Cluster Weighing Ultracompact Dwarf Galaxies in the Fornax Cluster

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msngr.129...49h&link_type=abstract

The Messenger, vol. 129, p. 49-52

Computer Science

2

Scientific paper

High-resolution spectra from the Ultraviolet and Visual Echelle Spectrograph (UVES) were used to derive internal velocity dispersions of Ultracompact Dwarf galaxies (UCDs) in the Fornax cluster of galaxies. The velocity dispersions, together with highly spatially resolved luminosity profiles from Hubble Space Telescope imaging (ACS camera), allowed us to derive the dynamical masses of the UCDs. We show that the mass-to-light ratios of UCDs in Fornax are consistent with those expected for pure stellar populations. No dark matter contribution is needed. Thus, these UCDs seem to be the result of star-cluster formation processes within galaxies, rather than being compact dwarf galaxies formed in dark-matter halos.

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