Statistics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7377m&link_type=abstract
HST Proposal ID #7377
Statistics
Hst Proposal Id #7377 Galaxies
Scientific paper
We will extend our V and I snapshot survey of nearby dwarf elliptical {dE} galaxies begun in Cycle 6 to fainter magnitudes and to include a comparison sample of dwarf irregular {dI} galaxies. This survey will provide important information on the globular cluster systems of such galaxies and the properties of their cores and nuclei. With twelve of thirty galaxies observed in Cycle 6 we see a tentative difference in globular cluster specific frequency {S_N} between nucleated and non-nucleated dE's. Other preliminary results are: 1} the values of S_N in the dE's appear to be more like that found in giant ellipticals than in spirals or irregulars; 2} the high resolution of HST allows us to more accurately classify a galaxy as nucleated or non-nucleated; and 3} many of the nuclei {or brightest clusters} are offset from the geometrical centers of the galaxies. However, we cannot immediately conclude that dE galaxies are low- luminosity ellipticals instead of stripped dI's because S_N in dI's has not been adequately measured. Also, there is a large scatter in S_N for the lowest luminosity galaxies in the present sample due to small number statistics for each galaxy. The new data will allow us to determine S_N in a comparable sample of dI galaxies and will reduce the uncertainty in S_N for the low luminosity dE's. Comparison of this data set to HST images of luminous elliptical galaxies and their globular cluster systems should provide valuable clues to the formation of galaxies and their globular clusters.
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