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Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10129p&link_type=abstract
HST Proposal ID #10129
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Hst Proposal Id #10129 Galaxies
Scientific paper
We intend to use the ACS/WFC to measure structural parameters {half light radius, King core radius and concentration parameter} of individual globular clusters {GCs} in NGC 1399. Very little is known about structural parameters of globular clusters as a function of radius outside the Local Group. The proposed observations, arranged in a 3x3 ACS mosaic, will allow us to perform the first detailed wide-field study of structural parameters of globular clusters in a giant elliptical galaxy. In particular we will: 1} study the size-galactocentric distance relation of globular clusters out to 55 kpc { 1.6 eff. radius of the GCS} and determine whether the observed differences in sizes between metal-rich and metal-poor globular cluster in early-type galaxies are primordial and thereby reflect fundamental differences in formation, or are due to projection effects; 2} match the GC position observed with HST/ACS with X-ray binaries identified over the full Chandra field, and use the above sizes to constrain physical models for X-ray binary formation in GCs. 3} The wealth of ground-based data available for this system {photometry+spectroscopy}, will allow us to correlate the structural properties with other GC properties, such as their chemical composition, luminosity, etc.
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