The shapes of spiral arms along the Hubble sequence

Details The shapes of spiral arms along the Hubble sequence The shapes of spiral arms along the Hubble sequence

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86.1847k&link_type=abstract

Astronomical Journal, vol. 86, Dec. 1981, p. 1847-1858. Research supported by the University of Minnesota.

Astronomy and Astrophysics

Astronomy

125

Astrometry, Galactic Rotation, Galactic Structure, Spiral Galaxies, Angular Velocity, Astronomical Models, Barred Galaxies, Kinematics, Pitch (Inclination), Spirals

Scientific paper

It is found, in light of shape and pitch angle measurements of the spiral arms in a large sample of nearby Sa-Sc galaxies, that neither logarithmic nor hyperbolic spirals accurately represent galactic arms. Within the limitations set by arm distortions, however, both forms may serve as interpolation functions in normal spirals. The measured pitch angles for 113 objects correlate weakly with arm structure and bulge-to-disk ratio, suggesting a less strict coupling of Hubble's classification criteria than has been previously believed. Maximum galaxy rotation velocity correlates with arm pitch, suggesting that the shape of the spiral pattern is dictated by kinematic parameters independently of the physical origin of the arms. A connection is also found between arm pitch and the absolute rotation velocity value rather than the angular velocity value.

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