Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6596c&link_type=abstract
HST Proposal ID #6596
Other
Hst Proposal Id #6596 Galaxies &Amp, Clusters
Scientific paper
We propose to study a mechanism of galaxy formation at the present epoch by obtaining WFPC2 images in three filters {F450W, F569W, and F814W} of two fields within the compact group of galaxies, HCG92 {Hickson Compact Group 92, also known as Stephan's quintet}. These fields encompass three interacting galaxies and their associated tidal features. Two different types of stellar systems may form as a consequence of mergers: globular clusters around the centers of merger products, and dwarf galaxies in the associated tidal debris. In R-band images, obtained at the Palomar 1.5m, we have identified 27 candidate dwarf galaxies in the tidal features in HCG92. HST WFPC2 images are needed to determine the nature of these objects by measuring surface brightness profiles and by resolving substructure and detailed morphology in different colors. In the two fields, the Planetary Camera will be positioned on a galaxy nucleus and on a portion of the tidal debris. The proposed exposures will allow resolution of forming globular clusters with the same properties as those observed with HST in several other merger remnants. This detailed study will enable an evaluation of how environmental conditions influence the nature of the stellar systems to be formed and an assessment of the contribution of tidal dwarf formation to the overall population of dwarf galaxies.
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