The excitation and evolution of density waves

Details The excitation and evolution of density waves The excitation and evolution of density waves

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..850g&link_type=abstract

Astrophysical Journal, Part 1, vol. 222, June 15, 1978, p. 850-858.

Astronomy and Astrophysics

Astrophysics

145

Astronomical Models, Density Wave Model, Galactic Evolution, Galactic Structure, Rotating Disks, Wave Excitation, Coriolis Effect, Fourier Transformation, Rotation, Shear Flow, Spiral Galaxies, Stellar Motions

Scientific paper

The behavior of density waves in a simple analog of a rotating disk is analyzed. The model considered is a thin gas sheet whose unperturbed velocity field is a parallel shear flow; the effects of rotation are simulated by introducing a Coriolis acceleration; the model exhibits Lindblad resonances and includes both long- and short-wavelength density waves among its linear perturbations. The linear perturbation equations are set up in a form appropriate to the model and rewritten in terms of the comoving coordinates of the unperturbed flow. The resulting equations are Fourier transformed and then solved in the tight-winding limit. The excitation of a wave packet by an external potential is calculated along with the packet's subsequent propagation, and analytical solutions are obtained which are valid everywhere, including the Lindblad and corotation resonances. It is found that a barlike potential excites long-wavelength trailing density waves at the Lindblad resonances. The amplification of a density wave incident on the forbidden zone surrounding corotation is also examined.

Affiliated with

Also associated with

No associations

Rating

The excitation and evolution of density waves does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The excitation and evolution of density waves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The excitation and evolution of density waves will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-787871