Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-16
Astronomy and Astrophysics
Astrophysics
2 pages, 2 figures, to be published in "IAU Symposium 217, Recycling Intergalactic and Interstellar Matter", ASP Conf. Series
Scientific paper
Direct evidence of stellar material from galaxy disruption in the intra-cluster medium (ICM) relies on challenging observations of individual stars, planetary nebulae and diffuse optical light. Here we show that the ultra-compact dwarf galaxies (UCDs) we have discovered in the Fornax Cluster are a new and easy-to-measure probe of disruption in the ICM. We present spectroscopic observations supporting the hypothesis that the UCDs are the remnant nuclei of tidally ``threshed'' dwarf galaxies. Deep optical imaging of the cluster has revealed a 43-kpc long arc of tidal debris, flanking a nucleated dwarf elliptical (dE,N) cluster member. We may be witnessing galaxy threshing in action.
Drinkwater Michael. J.
Gregg Michael D.
Hilker Michael
Karick Arna M.
West Marcia M.
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