Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8378w&link_type=abstract
HST Proposal ID #8378
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Hst Proposal Id #8378 Clusters Of Galaxies And Lensing
Scientific paper
We propose to use existing WFPC2 images of nearby elliptical and S0 galaxies to test the reliability of the Globular Cluster Luminosity Function {GCLF} for the purpose of making distance estimates. The `standard candle' of this method is the turnover point of the GCLF at M_V^0 eq -7.3 mag. The empirical evidence currently available, mostly from the Virgo and Fornax ellipticals, is that the internal precision of the GCLF turnover is +/-0.15 mag per galaxy, making the method competitive with even the best distance indicators. However, there is tentative evidence that effects such as dynamical evolution and differences in metallicity {among other second- order parameters} may slightly alter the turnover point. This provides the opportunity to reduce the already-small internal scatter of the method still further, and the possibility of better understanding the origin and evolution of globular clusters. We propose to pursue these goals by determining the GCLF for a sample of eq 80 galaxies from the archives, and searching for differences in the turnover as a function of cluster color, position within the galaxies, and environment of the galaxy. Our longer term goal is to use this data set to support a proposal using the Advanced Camera for Surveys {ACS} to measure H_0 to within an internal precision of 5 {external} precision of 7.
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