Arm classification and velocity gradients in spiral galaxies

Details Arm classification and velocity gradients in spiral galaxies Arm classification and velocity gradients in spiral galaxies

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376..458b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, Aug. 1, 1991, p. 458-466. Research supported by CNR and Ministero dell

Statistics

Computation

19

Galactic Rotation, Galactic Structure, Spiral Galaxies, Computational Astrophysics, Stellar Motions, Velocity Distribution

Scientific paper

On the basis of published rotation curves, velocity gradients are compiled for 94 galaxies. A significant correlation is found in this sample of galaxies between their gradients and arm classes (as given by Elmegreen and Elmegreen, 1982); galaxies with steeper curves tend to have a flocculent arm structure, and galaxies with flatter curves tend to have a grand design morphology. The correlation is true, since it is not induced by other correlations. The present result is in agreement with previous suggestions by Whitmore (1984) and with the recent result by Elmegreen and Elmegreen; it is also consistent with the predictions of density wave theory for the formation of the spiral structure.

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