Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7543t&link_type=abstract
HST Proposal ID #7543
Computer Science
Hst Proposal Id #7543 Cosmology
Scientific paper
WFPC-2 images of elliptical and lenticular galaxies provide a wealth of information about the galaxy, not all of which is always explored by the investigators who originally took the image. In particular, the surface brightness fluctuations {SBF} in the images can be used both as a measurement of distance, and possibly as an aid for the study of stellar populations. In addition, the study of the luminosity function and specific frequency of globular clusters has implications both for galaxy formation processes and the distance. Suitable images for at least fourteen Virgo galaxies are contained in the archive, which will allow us to study the shape of the Virgo cluster using depth measurements determined from SBF, to compare HST SBF measurements with those obtained from the ground, and to study if and how the characteristic of the globular cluster populations vary with position in this cluster. A few galaxies in the Fornax cluster, which will become available over the next year, and additional galaxies from the archive also will be analyzed. We have performed such an analysis of the SBF and globular clusters in NGC4478, a close companion of M87, using WFPC2 parallel images. In doing so, we have developed an SBF method better suited to the undersampled PSF of the WFPC-2 than the method more traditionally used with images from ground based telescopes. We also have developed an understanding of the process required for the globular cluster analysis.
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