Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-30
Reports on Progress in Physics (1993) v56 pp173-255
Astronomy and Astrophysics
Astrophysics
This old review appeared in 1993. Plain tex with macro file. 82 pages 18 figures. A pdf version with figures at full resolutio
Scientific paper
10.1088/0034-4885/56/2/001
Some 30% of disc galaxies have a pronounced central bar feature in the disc plane and many more have weaker features of a similar kind. Kinematic data indicate that the bar constitutes a major non-axisymmetric component of the mass distribution and that the bar pattern tumbles rapidly about the axis normal to the disc plane. The observed motions are consistent with material within the bar streaming along highly elongated orbits aligned with the rotating major axis. A barred galaxy may also contain a spheroidal bulge at its centre, spirals in the outer disc and, less commonly, other features such as a ring or lens. Mild asymmetries in both the light and kinematics are quite common. We 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. (Truncated)
Sellwood Jeremy A.
Wilkinson Althea
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