The role of resonances in the modal theory of spiral structure in galaxies

Details The role of resonances in the modal theory of spiral structure in galaxies The role of resonances in the modal theory of spiral structure in galaxies

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..640b&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 688, p. 640-643.

Astronomy and Astrophysics

Astronomy

14

Galactic Structure, Infrared Astronomy, Orbital Resonances (Celestial Mechanics), Resonant Frequencies, Spiral Galaxies, Stellar Structure, Corotation, Modal Response, Morphology

Scientific paper

Grand-design spiral galaxies are argued to be dominated by one or two global modes in relatively cool stellar disks. The dynamical support of these structures depends on the mutual interaction between gas and stars in the disk, the modeling of which is quite complex. On the observational side, a very promising tool to identify the underlying structure in the older stellar disk is the new imaging instrumentation in the K band; these infrared images are now showing a very smooth, regular, and low m large-scale spiral structure even when the visual appearance exhibits multiple-armed and branched structures. In the modal theory of spiral structure, resonances play a crucial, but in many respects indirect, role. I will focus here on two specific aspects that have direct observational counterparts: (1) typical location of the corotation circle for normal and for barred modes and (2) the interpretation of observed gaps in terms of interference patterns of the waves supporting the modes.

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