Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6496b&link_type=abstract
HST Proposal ID #6496
Other
Hst Proposal Id #6496 Galaxies &Amp, Clusters
Scientific paper
We propose to obtain multi-band PC1 images of two ``nuclear rings'' in barred galaxies, chosen on the basis of showing strong star formation and other characteristics in ground- based images. These small rings, less than 10'' in angular radius, are thought to trace the location of the inner Lindblad resonance {ILR}, a 2:1 orbital resonance with the bar that is of great importance to the structure and evolution of disk galaxies. We wish to map the detailed structure in and near these rings, such as dust lanes, shock fronts, and star-forming complexes, from the near-UV to the near-IR in order to examine the process of star formation in the resonance region and to connect the morphology to dynamics. We will use the data to address the following questions. {1} What is the rate of massive star formation in these rings? {2} Is the star formation in the rings continuous or episodic, occurring in periodic ``bursts''? {3} What is the luminosity function of star clusters and HII regions in the rings? {4} How are dust lanes distributed around the rings, and what ``feeds'' the gas to the ring region? {5} How does the small-scale structure in the rings connect to periodic orbit characteristics, bar strength, pattern speed, central density, and the stellar distribution? We will interpret the results in terms of sophisticated numerical models {including stars and gas} of the ILR region in a barred galaxy. The observations should have a significant impact on our understanding of nuclear activity, central starbursts, and galaxy morphology. The sample consists of the nuclear rings in NGC 1326 and ESO 565-11. The former nuclear ring is about average in linear size and intrinsic shape, while the latter is unusually large in linear size and extremely oval in intrinsic shape. Together the two rings should provide complementary insights into the nuclear ring phenomenon.
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