Statistics of structure and rotation parameters of disk galaxies |
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Authors: | Hu Fu-xing |
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Institution: | Purple Mountain Observatory, China |
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Abstract: | Through an analysis of the optical and radio rotation curves of 57 galaxies, the following conclusions are drawn. 1) As we go from early-type to late-type along the Hubble sequence, dynamical quantities characterizing the structure and rotation show systematic variations. The bulge-to-disk mass-ratio decreases, the peak velocity Vm decreases, the period at the peak-velocity-point Pm increases, the peak-velocity-radius rm shifts outward relative to the optical Holmberg radius rH, the spiral arms become more loosely-wound and the galaxy flattens. 2) Within a given morphological type, the dispersion in each of the dynamical quantities is related to the mass, the more massive galaxies have larger Vm and rm and small k (= Vm2/rm) and β (= rH/rm.3) another important factor in influencing the dynamical state of a galaxy and, within a morphological type, the tidal galaxies have greater k and β and smaller rm. |
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