Computer Science
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phdt.........7b&link_type=abstract
Ph.D. Thesis Texas Univ., Austin.
Computer Science
33
Galactic Evolution, Galactic Structure, Luminosity, Ring Structures, Spiral Galaxies, Gravitational Fields, Kinematics, Metrology, Morphology, Photometry, Spectroscopy
Scientific paper
In many spiral and SO galaxies, single or multiple ring structures are visible in the disk. These inner rings(r), outer rings (R), and nuclear rings (nr) are investigated by means of morphology, photometry, and spectroscopy in order to provide basic data on a long neglected phenomenon. The metric properties of each ring are investigated and found to correlate with the structure of the parent galaxy. A survey is made of the less homogeneous non-barred (SA) ringed systems, and the causes of the inhomogeneity are isolated. It is shown that rings can be identified in multiple-ring SA systems which are exactly analogous to those in barred spirals. Most of the observations favor the resonance hypothesis for the origin of these rings in normal galaxies. This hypothesis interprets the rings as concentrations of stars and gas which have developed secularly near the well-known dynamical Lindbald resonances expected to occur in systems perturbed by small non-axisymmetric components in the gravitational potential.
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