Progress in the Study of Galaxies: Structures, Collective Phenomena and Methods

Details Progress in the Study of Galaxies: Structures, Collective Phenomena and Methods Progress in the Study of Galaxies: Structures, Collective Phenomena and Methods

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ssrv..105....1f&link_type=abstract

Space Science Reviews, v. 105, Issue 1, p. 1-284 (2003).

Physics

9

Disk Galaxies, Spiral Density Waves, Velocity Fields, Structures And Chaos

Scientific paper

The review contains the important achievements in dynamics of the galactic disks. Among them there are I. New structures discovered recently: • giant vortices (including giant anticyclone in the Solar vicinity); • slow bar; • inner oscillating structure within spiral arms similar that of enveloped soliton; • chaotic streamlines in the velocity field of the gaseous disk of a real galaxy. II. New collective phenomina discovered recently: • new overreflection instability initiating ‘mini-spiral’ in the innermost central parsec of Galaxy; • large-scale convection caused by nonlinear interaction of density wave with disk gas; • non-kolmogorovian spectrum of weak turbulence corresponding to the observed one in the • Solar vicinity. III. New methods worked out recently: • reconstruction of full three-dimensional vector field of gas velocity from the observed line-of- • sight velocity field; • observational test for verification of the wave-nature of the spiral arms; • observational test to distinguish two types of vertical motions: warp and z-motions in the • density wave; • derivation of correct system of two-dimensional dynamical equations from the initial three- • dimensional one.

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