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Fast and Slow Bars: A Comparative Analysis

Published online by Cambridge University Press:  12 April 2016

Valerij L. Polyachenko
Valerij L. Polyachenko*
Affiliation:
Institute of Astronomy, 48 Pyatnitskaya St., Moscow 109017, Russia

Abstract

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The in-plane appearance of barred galaxies is formed in either of two ways: 1) the usual bar-mode instability in a fast rotating disk forms a fast bar, while 2) the radial orbit instability (or its modifications) leads to a slow bar. The vertical structure depends on the universal mechanism of the bending instability both in fast and slow bars. Among all the relevant topics, I chose (i) a critical review of the work on the bending instability, and (ii) some comments concerning the local and global stability criteria for non-axisymmetric disturbances in galactic disks; in particular, a new approximate local dispersion relation for a star disk is presented. Also shown is a range of accuracy for the intuitional global criterion of the slow bar instability of the Ostriker-Peebles type (on the example of the exactly-solved model).

Type
Part VII. Theory and Observation
Information
International Astronomical Union Colloquium , Volume 157: Barred Galaxies , 1996 , pp. 405 - 412
Copyright
Copyright © Astronomical Society of the Pacific 1996

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