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Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9542g&link_type=abstract
HST Proposal ID #9542
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Hst Proposal Id #9542 Stellar Populations
Scientific paper
The central surface brightness and luminosity density profiles in any stellar system are crucial for understanding the governing dynamical processes. Those profiles for galaxies are well-measured by HST and have been used to make significant scientific progress. Globular clusters, on the other hand, do not have a well established dataset for their central surface brightness profiles. Yet, the archive is ripe with high signal-to-noise data on globular clusters. We will measure the central surface brightness profiles for about 30 globular clusters. We have searched the archives for those clusters with adequate signal to provide robust estimates of their central profile. This data will be combined with our extensive radial velocity dataset in the central regions to provide a unique opportunity to explore the central dynamics. The radial velocities show a dramatic increase in the rotational signature at small radii. Interpretation of this result requires a detailed understanding of the central surface brightness profiles. Any future endeavor to study globular cluster dynamics must include the central profiles. We have reached the point where the kinematics have been analysed to better spatial resolution, and this proposal addresses the need to place the surface brightness profiles on a more firm level.
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