Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8735d&link_type=abstract
HST Proposal ID #8735
Mathematics
Logic
Hst Proposal Id #8735 Stellar Populations
Scientific paper
We propose an archival study of globular clusters in the nearby galaxies M31, M33, NGC 205, and NGC 185. Our goal is to construct dynamical correlations for globular clusters in these diverse galaxies and to compare them mutually, as well as with the properties of the Milky Way globulars. These correlations probe directly the physics and formative processes of globulars, their homogeneity {or lack thereof}, and can be also used as new distance indicator relations for their parent galaxies, providing an independent check of other distance scales. The high angular resolution of the HST images is emphessential for this project: they will be used to extract a uniform set of morphological and photometric parameters for these objects, which we will combine with high- S/N measurements of their velocity dispersions from the Keck telescope. We would use this data set of fundamental cluster parameters to perform a detailed dynamical modeling of these systems, including their {M/L} ratios. We would construct for the first time the Fundamental Plane correlations for these globular cluster systems, and compare them among the target galaxies. Perhaps the most interesting is the correlation between the {M/L} ratios and cluster metallicities. This relation and its scatter probe directly the cluster IMFs, the dependence of cluster model isochrones on metallicity, and may even constrain a possible spread in the cluster ages.
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