Spiral arm amplitude variations and pattern speeds in the grand design galaxies M51, M81, and M100

Details Spiral arm amplitude variations and pattern speeds in the grand design galaxies M51, M81, and M100 Spiral arm amplitude variations and pattern speeds in the grand design galaxies M51, M81, and M100

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..602e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 15, 1989, p. 602-607.

Astronomy and Astrophysics

Astrophysics

117

Andromeda Galaxy, Galactic Structure, Spiral Galaxies, Interstellar Gas, Orbital Resonances (Celestial Mechanics), Star Formation

Scientific paper

In the modal theory of galactic spiral structure, the amplitude of a prominent two-arm spiral pattern should oscillate slightly with galactocentric distance because of an interference between the outward and inward propagating waves. In the stellar dynamical theory, the spiral arm amplitudes should oscillate because of differential crowding near and between wave-orbit resonances. Two and three cycles of such oscillations have been found in computer-enhanced images at B and I passbands of the grand design galaxies M81 and M100, respectively, and what is probably one cycle of such an amplitude variation in M51. These three galaxies are the most symmetric and global of the two-arm spirals in the near-IR survey of Elmegreen (1981), so the occurrence of such spiral amplitude oscillations could be common among galaxies of this type. The positions of the features discussed are used to suggest possible arm pattern speeds.

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