Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7466c&link_type=abstract
HST Proposal ID #7466
Other
Hst Proposal Id #7466 Galaxies
Scientific paper
We propose to study the range of substructures found within the tidal tails of the classic mergers NGC 4038/9, NGC 3921, NGC 7252, and NGC 3256. Structures as large as dwarf Irregulars are found within the tidal debris of each system, and we wish to explore whether there is a continuum of structure all the way down to globular clusters, which are found in such high numbers in the central regions of these mergers. Our sample includes a total of eight tidal tails occurring within four mergers at a variety of evolutionary stages and with a range of properties, and will cover both regions with and without an embedded tidal dwarf. By obtaining WFPC2 images in V and I we will determine the distributions of luminosities, colors, and sizes of all substructures within the tidal tails. These will be contrasted with the properties of the hundreds of young clusters in the central regions. Questions to be addressed include: 1} Do globular clusters form {and survive} in all regions of tidal debris or only within central regions; 2} Do tidal dwarfs also host star clusters; 3} Combining with dynamical information extracted from VLA HI maps, can we constrain the evolution of populations of young globulars {i.e. of their sizes and luminosities}? By modeling these systems with N-body hydrodynamic codes, can we identify the physical circumstances and formation histories which can produce tidal dwarfs, star clusters, and other structures in tidal tails?
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