The rotation curves of normal galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Angular Velocity, Galactic Rotation, Galactic Structure, Optical Measurement, Astronomical Catalogs, Colorimetry, Histograms, Luminous Intensity

Scientific paper

Data from published, primarily optical V(R) curves (at radii out to 25 percent of optical diameter) for 101 normal galaxies of types S0, to Ir are compiled in tables and analyzed. Four classes of curve are defined: monotonic rise, rise to plateau, rise and fall, and complex. About 20 percent of all objects and 33 percent of late-type galaxies are found to be of the third type (with turnover), but no relationship is found between morphology and turnover or plateau point. Correlations between maximum V and color indices, integrated luminosity, bulge luminosity, and (weakly) disk luminosity are established and shown in graphs.

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