Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..171b&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
The superior resolution and large format of the Advanced Camera for Surveys make it a powerful new tool in the study of extragalactic globular cluster (GC) systems. We present early results on the GC populations of galaxies observed in the ACS GTO program spanning the full range of environment and morphology. In particular NGC2915 is an isolated dwarf 4 Mpc away with an extremely high dark matter content and an extended HI disk with spiral structure. Our ACS image reveals 3 easily resolved old halo GCs within a limited field indicating a high GC specific frequency although a more normal number per unit mass. The specific frequency could be reduced to a level typical of spiral galaxies through quiescent star formation in the HI disk making this a key galaxy for understanding the evolving relationship between GC systems and their host galaxies. At the other extreme we find a teeming GC population in the core Abell 1689 at z = 0.18 the most powerful cluster lens in the sky. Besides being the most distant GC system studied to date extrapolation of the counts according to the GCLF indicates that this cluster harbors the most numerous assemblage of globular clusters yet.
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