Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...106..274b&link_type=abstract
Astronomy and Astrophysics, vol. 106, no. 2, Feb. 1982, p. 274-286. Research supported by the Consiglio Nazionale delle Ricerch
Astronomy and Astrophysics
Astrophysics
21
Astronomical Models, Disk Galaxies, Galactic Rotation, Rotating Fluids, Scaling Laws, Density Wave Model, Dynamic Stability, Galactic Structure, Halos, Warpage, Wave Excitation
Scientific paper
The paper investigates the properties of bending waves in a rotating fluid layer of finite thickness in the presence of a nonrotating thicker layer. A scaling law is derived, which relates the amplitude of the warp to the local surface density. Results of a comparison with observations confirm that collective self-consistent dynamics play an important role in the phenomenon of warps. The analysis supports the view that a two-stream instability between the disk and the halo components in galaxies can be at the basis of warp excitation, and a comparison with previous calculations on an infinitesimally thin disk model suggests that the simple fluid scheme could be applied to investigate further the dynamics of galaxy warps.
Bertin Giuseppe
Casertano Sefano
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