Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26q.199s&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
Scientific paper
NGC 1399 is the central giant elliptical of the nearby Fornax cluster of galaxies. Our sample now consists of 625 GCs with projected galactocentric distances between 6 and 100 kpc, thus increasing by almost a factor of two the radial range in comparison to the study presented by Richtler et al. 2004). We determine the line-of-sight velocity dispersion as a function of radius and compare it to spherical Jeans-models. We find that a massive dark halo is required in order to explain the dynamics of the metal-poor (red) GCs. At 60 kpc, the dark matter fraction is 60%. In accordance with their shallower radial distribution, the metal-rich (blue) GCs show a higher line-of-sight velocity dispersion. Yet, there is reason to believe that the blue cluster population of NGC 1399 is contaminated by intra-cluster GCs which perhaps have been stripped off neighboring early-type galaxies. The center of the Fornax cluster is a complex environment, and a more detailed analysis of our data will allow us to better understand the GC systems of central giant ellipticals and their connection to the galaxy clusters in which they reside.
Hilker Michael
Richtler Tom
Schuberth Ylva
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