Unstable modes from galaxy simulations
J. A. Sellwood,E. Athanassoula +1 more
TLDR
This article propose des techniques numeriques which permettent de calculer des frequences propres and des modes propres a partir de simulations sur ordinateur des disques stellaires.Abstract:
On propose des techniques numeriques qui permettent de calculer des frequences propres et des modes propres a partir de simulations sur ordinateur des disques stellairesread more
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Journal ArticleDOI
Radial mixing in galactic discs
J. A. Sellwood,James Binney +1 more
TL;DR: In this paper, it was shown that spiral waves churn the stars and gas in a manner that largely preserves the overall angular momentum distribution and leads to little increase in random motion, and that changes in the angular momenta of individual stars are typically as large as ∼50 per cent over the lifetime of the disc.
Journal ArticleDOI
Constraints from Dynamical Friction on the Dark Matter Content of Barred Galaxies
TL;DR: In this paper, it was shown that bars in galaxy models having halos of moderate density and a variety of velocity distributions all experience a strong drag from dynamical friction unless the halo has large angular momentum in the same sense as the disk.
Journal ArticleDOI
Dynamics of Barred Galaxies
J. A. Sellwood,Althea Wilkinson +1 more
TL;DR: In this article, the authors review the main problems presented by these complicated dynamical systems and summarize the effort so far made towards their solution, emphasizing results which appear secure, and conclude that the observed motions are consistent with material within the bar streaming along highly elongated orbits aligned with the rotating major axis.
Journal ArticleDOI
Dawes Review 4: Spiral Structures in Disc Galaxies
Clare Dobbs,Junichi Baba +1 more
TL;DR: In this article, the authors discuss the progress in theory, and in particular numerical calculations, which unlike in the 1960s and 1970s, are now commonplace, as well as recent observational developments.
Journal ArticleDOI
Radial Migration in Disk Galaxies I: Transient Spiral Structure and Dynamics
TL;DR: In this article, the authors study the origin and evolution of radial migration in spiral galaxies by analyzing in detail the structure of an idealized, isolated galactic disk and characterize the time-evolution of properties of spirals that spontaneously form in the disk.