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Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10315g&link_type=abstract
HST Proposal ID #10315
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Hst Proposal Id #10315 Stellar Populations
Scientific paper
The luminosity density profiles, which are obtained from surface brightness profiles, are a crucial component for dynamical studies of any stellar system. Thanks to HST, there has been important discoveries on the central part of these profiles for galaxies. Globular clusters, on the other hand, have not been explored with such level of detail. From our previous archival proposal {AR-9542}, we find that most globular clusters do not have analytic cores. This is in contrast to what has always been assumed, when 80% are well fitted by King models. Weak cusps in these clusters will have important dynamical consequences, and in particular it will be difficult to understand why these cores are not isothermal since theoretical results predict that they should be. Our goal here is to extend these studies to include the LMC globular clusters. there are 53 LMC clusters in the archive, and about 75% of them have adequate signal to obtain a central slope. This will both double the the current sample of GC with well measured profiles, and provide excellent coverage of parameters space, needed to compare with evolutionary models. The LMC clusters provide an important coverage in parameter space, since they are extremely young, and when combined with our studies of the Galactic clusters have the most influence on the theoretical models.
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