Mathematics – Logic
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phdt.........9k&link_type=abstract
Thesis (PhD). CORNELL UNIVERSITY, Source DAI-B 61/09, p. 4774, Mar 2001, 224 pages.
Mathematics
Logic
1
Scientific paper
A sample of 32 isolated disk galaxies is observed and analyzed for deviations from morphological and kinematic axisymmetry. The morphological method involves comparing the relative fluxes contained within trapezoidal sectors arranged symmetrically about the galaxy center of light, excluding the bulge and/or barred regions. Four quantitative measures of dynamical nonaxisymmetry are then compared to one another and to the quantitative measures of morphological asymmetry in HI and R-band to investigate the relationships between nonaxisymmetric morphology and dynamics. These quantifiers are applied to the original sample and also to a sample of morphologically normal but kinematically decoupled Sa disks. Finally, a computer simulation of librational motion in galaxies is performed to test the hypothesis that free libration of disks within dark halos contributes to nonaxisymmetries in isolated galaxies.
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