Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8707b&link_type=abstract
HST Proposal ID #8707
Computer Science
Hst Proposal Id #8707 Galaxies
Scientific paper
Rings of star formation are a common phenomenon of early-type spiral galaxies. Most rings form by gas cloud collisions near resonances, under the continuous action of gravity torques from a bar perturbation, while a small number form in response to a mild tidal interaction with a nearby companion. In either case, a resonance is a very special place in any galaxy where star formation can be enhanced and may proceed either as a starburst or continuously over a long time period. Resonance rings are natural dynamical laboratories for star cluster formation and evolution. We are proposing here to study star formation in two galaxies where we feel certain that the rings are resonance rings with a different origin. NGC 3081 has four excellent star-forming rings that are easily connected to bar- driven gas dynamics, while NGC 4622 is a nonbarred spiral where a strong inner ring is easily connected to a tidal interaction. We wish to isolate the young clusters in the rings of these two galaxies, measure their ages and luminosity functions, examine the properties of the background starlight, and use the information to trace the dynamics of these galaxies and understand the interplay between perturbations, gas dynamics, and star formation in normal galaxies.
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