Bi-symmetric instabilities of the Kuz'min/Toomre disc

Details Bi-symmetric instabilities of the Kuz'min/Toomre disc Bi-symmetric instabilities of the Kuz'min/Toomre disc

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221..213a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, July 1, 1986, p. 213-232.

Astronomy and Astrophysics

Astronomy

143

Motion Stability, Star Formation, Stellar Models, Stellar Motions, Disk Galaxies, Random Processes, Spiral Galaxies, Stellar Envelopes, Stellar Mass

Scientific paper

This paper reports a numerical study of the effect of random motion on the unstable bar-forming modes of one type of stellar disc mass model. From measurements of the growth rates of the few most unstable bi-symmetric modes the authors evaluate the stabilizing influence of both random motion and halo mass. They find that the growth rate of bars is a simple function of these two variables. Their results suggest that the large degree of random motion recently observed near the centres of galactic discs substantially reduces the halo mass needed to understand their stability.

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