Dwarf Elliptical Galaxy Snapshot Survey III

Details Dwarf Elliptical Galaxy Snapshot Survey III Dwarf Elliptical Galaxy Snapshot Survey III

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8600f&link_type=abstract

HST Proposal ID #8600

Statistics

Hst Proposal Id #8600 Galaxies

Scientific paper

We propose to extend our V and I snapshot survey of nearby dwarf elliptical {dE} galaxies to include a sample of 30 bright dE {M_V < - 15.7} with significant globular cluster {GC} populations. This survey will provide important information on the globular cluster systems of such galaxies and the properties of their cores and nuclei. The high resolution of HST allows us to identify globular cluster candidates and classify more accurately a galaxy as nucleated or non-nucleated. Our results from the Cycle 6 survey show that dE have globular cluster specific frequencies {S_N} similar to those of giant ellipticals. Nucleated dE have higher S_N than non-nucleated dE, and show a trend of increasing S_N with fainter luminosities. We have also studied the spatial distribution of the globular clusters and an interesting {lack of a} trend is emerging. The globular cluster surface densities follow the luminosity profiles of the underlying galaxies, on average, and there is no segregation by luminosity. This is an interesting result, if confirmed, because the dynamical friction timescales for dE galaxies are significantly shorter than a Hubble time. With better statistics, analysis of the cluster spatial distribution can place constraints on the ages of the clusters and the dark matter, and offer tests of the universality and evolution of the globular cluster luminosity function.

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