Isolated compact stellar systems in the Fornax Cluster

Details Isolated compact stellar systems in the Fornax Cluster Isolated compact stellar systems in the Fornax Cluster

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8685d&link_type=abstract

HST Proposal ID #8685

Computer Science

Hst Proposal Id #8685 Galaxies

Scientific paper

We have discovered a new population of compact objects in the centre of the Fornax Cluster. These objects have spectra typical of old stellar systems, but are unresolved in ground- based imaging. They are all at least 10 times more luminous than any Galactic globular clusters, but fainter than any known compact dwarf galaxies. They may be a new class of intermediate object, neither globular clusters nor dwarf galaxies but something in between. We request HST imaging of a sample of these objects to measure their light profiles and determine their structure. We need the high resolution imaging of HST to measure the radii of these objects which we will combine with ground-based spectroscopy to determine their mass-to-light ratios. This will allow us to compare them to known compact objects such as globular clusters and the nuclei of dE galaxies to establish if they do indeed represent a new class of hitherto unknown stellar system.

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